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| 1 | Microstructural evolution and FCC twinning behavior during hot deformation of high temperature titanium alloy Ti65显示文摘Although the development of titanium alloys with working temperatures above 600?C faces enormous difficulties and challenges,the related research has not stopped.In the present work,detailed analyses on microstructure evolution and hot deformation behavior of a new temperature resistant 650?C titanium alloy Ti65 were investigated from micrometer scale to nanometer scale.The results revealed that lamellarαgrains gradually fragmentized and spheroidized during theα+βphase region compression and the orientation of the c-axis ofαgrains gradually aligned to radial directions,forming two high Schmid factors(SFs)value texture eventually with the increase of strain to 0.7.Moreover,there were some strengthening characters in theα+βphase region such as lenticularαsand nano silicide(TiZr)6 Si3.In theβphase region,fine equiaxed dynamic recrystallized(DRX)βgrains were formed.Besides,the variant selection ofαm′artensite followed Burgers orientation relationship during the compression process.The main deformation mechanisms of theα+βphase region were dislocation slip and orientation dependent spheroidization.Whereas,the deformation process in theβphase region was controlled byβgrain DRX.Interestingly,many nano scale FCC twins were generated at the interface ofαl′ath during deforming in theβphase region,which was firstly observed in Ti65 alloy. | Zhixin Zhang Jiangkun Fan Bin Tang Hongchao Kou Jian Wang Xin Wang Shiying Wang Qingjiang Wang Zhiyong Chen Jinshan Li | 2020 | Journal of Materials Science & Technology2020，47，14： | 10 |
| 2 | Dependence of mechanical properties on the microstructure characteristics of a near β titanium alloy Ti-7333显示文摘In this work, the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al(Ti-7333) alloy before and after the thermal treatments were investigated. The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy. The deformed matrix and the texture significantly induce the variant selection of β phase. The high strength of the rolled Ti-7333 alloy is attributed to the <110> texture parallel to the tensile direction and the dispersed α phase within the matrix. After the solution treatment followed by the aging treatment, the texture decreases and the microstructure consists of the equiaxed β grains, the spheroidal α_p phase and various needle-like α variants. Eventually, the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5% and a considerable shear strength of about 775 MPa. This balance can be ascribed to the performance of the spheroidal α_p phase and various needle-like α_s variants. The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener. | Ruifeng Dong Jinshan Li Hongchao Kou Jiangkun Fan Bin Tang | 2019 | Journal of Materials Science & Technology2019，35，1： | 4 |
| 3 | DID Code:A Bridge Connecting the Materials Genome Engineering Database w让h Inheritable Integrated Intelligent Manufacturing显示文摘A data identifier(DID)is an essential tag or label in all kinds of databases—particularly those related to integrated computational materials engineering(ICME),inheritable integrated intelligent manufacturing(I3M),and the Industrial Internet ofThings.With the guidance and quick acceleration of the developme nt of advanced materials,as envisioned by official documents worldwide,more investigations are required to construct relative numerical standards for material informatics.This work proposes a universal DID format consisting of a set of build chains,which aligns with the classical form of identifier in both international and national standards,such as ISO/IEC 29168-1:2000,GB/T 27766-2011,GA/T 543.2-2011,GM/T 0006-2012,GJB 7365-2011,SL 325-2014,SL 607-201&WS 363.2-2011,and QX/T 39-2005.Each build chain is made up of capital letters and numbers,with no symbols.Moreover,the total length of each build chain is not restricted,which follows the formation of the Universal Coded Character Set in the international standard of ISO/IEC 10646.Based on these rules,the proposed DID is flexible and convenient for extendi ng and sharing in and between various cloud-based platforms.Accordingly,classical two-dimensional(2D)codes,including the Hanxin Code,Lots Perception Matrix(LP)Code,Quick Response(Q.R)code,Grid Matrix(GM)code,and Data Matrix(DM)Code,can be constructed and precisely recognized and/or decoded by either smart phones or specific machines.By utilizing these 2D codes as the fingerprints of a set of data linked with cloud-based platforms,progress and updates in the composition-processing-structure-property-performance workflow process can be tracked spontaneously,paving a path to accelerate the discovery and manufacture of advanced materials and enhance research productivity,performance,and collaboration. | William Yi Wang Peixuan Li Deye Lin Bin Tang Jun Wang Quanmei Guan Qian Ye Haixing Dai Jun Gao Xiaoli Fan Hongchao Kou Haifeng Song Feng Zhou Jijun Ma Zi-Kui Liu Jinshan Li Weimin Liu | 2020 | Engineering2020，6，6： | 4 |
| 4 | Study on the formation mechanism of α lamellae in a near β titanium alloy显示文摘In order to obtain more insight in the two existing mechanisms on the nucleation, i.e., sympathetic nucleation and interface instability nucleation, of α lamellae in the near β Ti alloys, the micro-texture ofα lamellae in Ti-7Mo-3Nb-3Cr-3Al has been investigated by using electron backscatter diffraction(EBSD).The results show that the α_(WGB) lamellae can not only grow up from α_(GB) grains by inheriting the orientations but also sympathetically nucleate at the α_(GB)/β interface during the slow cooling process. These observations provide the first direct experimental evidence that the formation mode of α lamellae in Ti-7333 alloy consists of sympathetic nucleation and interface instability nucleation. Based on the present results together with some previous studies on α phase transformation in Ti-based alloys the influence of β-stabilizers parameter on the change of formation mechanism of α lamellae was discussed. | Bin Tang Hongchao Kou Xue Zhang Puyi Gao Jinshan Li | 2016 | Progress in Natural Science:Materials International2016，26，4： | 3 |
| 5 | Microstructure and texture evolution of a near β titanium alloy Ti-7333 during continuous cooling hot deformation显示文摘The microstructure and texture evolution during continuous cooling hot deformation(CCHD) in a near β titanium alloy, named Ti-7Mo-3Nb-3Cr-3Al(Ti-7333), were investigated by using the electron backscattered diffraction(EBSD). The results indicate that the precipitation of secondary α phase was restricted by CCHD, and the morphology of primary α phase nearly had no change with the deformation and temperature drop. In contrast, βphase underwent more deformation and the grains tended to refine. This may be due to the dynamic recrystallization(DRX) of β phase, including continuous dynamic recrystallization(CDRX) and discontinuous dynamic recrystallization(DDRX). In addition, the textures of {110} < 110 >, {225} < 520 > and{115} < 123 > transformed to {100} < 110 > and {001} < 100 > during CCHD. Among these, the η-fiber component of {001} < 100 > was the dominant deformation texture in the deformed Ti-7333 alloy. Finally,continuous cooling has an important effect on the work hardening and softening during CCHD, contributing to the different flow behaviors at different cooling rates. | Jiahao Chen Jinshan Li Bin Tang Yi Chen Hongchao Kou | 2019 | Progress in Natural Science:Materials International2019，29，1： | 2 |
| 6 | Dynamic recrystallization and phase transformation behavior of a wroughtβ-γTiAl alloy during hot compression显示文摘The dynamic recrystallization(DRX)and phase transformation(PT)behavior of a wroughtβ-γTiAl alloy during hot compression under various deformation temperatures were investigated.The typical work hardening and flow softening features indicated that DRX was the dominating softening mechanism.Both y-DRX andβ-DRX took place during the hot compression.y-DRX was triggered at all compression temperatures,while theβ-DRX was induced when the compression temperature was above 1000℃.The hot deformation kinetics was calcu-lated,which showed that DRX behavior existed in the whole hot compression process,and the DRX volume fraction increased with the increase of the compression temperature.Combined with the microstructure ob-servation,it concluded that theβ/B2+a2-+y PT occurred at 850℃and 1000 C,while theγ-+β/B2 PT hap-pened at 1050℃during hot compression,which is important to optimize microstructure.Moreover,the hot compression mechanism changed from dislocation gliding to grain-boundary sliding was discussed. | Lei Zhu Jinshan Li Bin Tang Fengtong Zhao Ke Hua Shaopeng Yan Hongchao Kou | 2020 | Progress in Natural Science:Materials International2020，30，4： | 2 |
| 7 | Mechanical characterization and strain-rate sensitivity measurement of Ti-7333 alloy based on nanoindentation and crystal plasticity modeling显示文摘The relationship between crystal orientations and meso-mechanical properties of β phase Ti-7333 titanium was investigated through the combination of nanoindentation experiments and simulation. The crystal plasticity finite element(CPFE) model for nanoindentation of single body-centered cubic crystal was established based on the experimental data. And the crystal plasticity constitutive law was implemented to simulate the nanoindentation process, obtaining satisfied results with an acceptable error. From the simulated pileup morphology patterns with different crystal orientations, it was found that the β phase experienced a symmetrical and orientation-related deformation process. Meanwhile, the strain-rate sensitivity(SRS) of β phase was investigated through nanoindentation tests based on continuous stiffness measurement(CSM) under different strain rates,varying between 0.2, 0.05 and 0.01 s^(-1). Two grains with different orientations exhibited similar SRS exponents,m, calculated from the experimental results. | Mengqi Zhang Jinshan Li Bin Tang Hongchao Kou Jiangkun Fan | 2018 | Progress in Natural Science:Materials International2018，28，6： | 1 |
| 8 | Kinetics of the ω phase transformation of Ti-7333 titanium alloy during continuous heating显示文摘 | Qiong Hui Xiangyi Xue Hongchao Kou Minjie Lai Bin Tang Jinshan Li | 2013 | Journal of Materials Science2013，，5： | 1 |
| 9 | Static recrystallization simulations by coupling cellular automata and crystal plasticity finite element method using a physically based model for nucleation显示文摘 | Fengbo Han Bin Tang Hongchao Kou Liang Cheng Jinshan Li Yong Feng | 2014 | Journal of Materials Science2014，，8： | 1 |
| 10 | Cellular automata modeling of static recrystallization based on the curvature driven subgrain growth mechanism显示文摘 | Fengbo Han Bin Tang Hongchao Kou Jinshan Li Yong Feng | 2013 | Journal of Materials Science2013，，20： | 1 |
| 11 | Hot deformation behaviors of WE71 alloy under plain strain compression at elevated temperature显示文摘Hot deformation behaviors of WE71(Mg-7Y-lNd-0.5Zr)alloy was investigated by plain strain compression tests conducted at temperatures ranging from 350℃to 500℃and strain rates varying from 0.01s^-1 to 10s^-1.Results show that the hot deformation of WE71 was accompanied by the precipitation of rich Zr phase with granular shape and block-shaped phase rich in element Y.When deformed at low temperature and high strain rate,the softening behavior of the alloy was synergically determined by shear bands propagation,adiabatic heating,twinning formation and dynamic recrystallization(DRX).For the conditions of high temperature and high strain rate,DRX was the major softening mechanism while the formation and annihilation of extension twinning resulted in a special flow curve characteristic at the strain of around 0.3.According to the microstructural observations,it can be concluded that the irregular flow curves of WE71 alloy during plain strain compression process are mainly ascribed to shear bands propagation,adiabatic heating,twinning formation and DRX. | Bangqi Yin Xiangyi Xue Bin Tang Yi Wang Hongchao Kou Jinshan Li | 2020 | Progress in Natural Science:Materials International2020，30，4： | 1 |
| 12 | Duality of the fatigue behavior and failure mechanism in notched specimens of Ti-7Mo-3Nb-3Cr-3Al alloy显示文摘An interesting phenomenon of dual S-N fatigue behavior is investigated in a metastable β titanium alloy,Ti-7 Mo-3 Nb-3 Cr-3 Al notched cylindrical specimens with an elastic stress concentration factor of Kt=3.Fractographic studies revealed all specimens,and irrespective of lifetime,failed from the specimen surface because of stress concentration occurs at the notch root.Typically,the short-life-distribution is usually associated with surface-failure-without-facets and the long-life-distribution generally occurs due to surface-failure-with-facets.This competing failure leads to increasing the variability in fatigue lifetime and further facilitates the difficulty in prediction of fatigue lifetime.Crack-initiation area characterization was conducted by using mechanical grinding,focused ion beam milling and subsequent electron backscattered diffraction(EBSD) analysis of the 2 D section across faceted grains.Results show that the α_p particles(especially the elongated α_p particles) well-oriented for basal slip activation is a preferential fatigue-critical microstructural configuration.Additionally,the β+α_s matrix has a higher KAM value than the α_p particles in fatigued microstructures and significant dislocation activity in the form of dislocation tangles is observed in α_p boundaries. | Zhihong Wu Hongchao Kou Nana Chen Mengqi Zhang Ke Hua Jiangkun Fan Bin Tang | 2020 | Journal of Materials Science & Technology2020，47，15： | 0 |
| 13 | Targeting myeloid-derived suppressor cells for cancer therapy显示文摘The emergence and clinical application of immunotherapy is considered a promising breakthrough in cancer treatment.According to the literature,immune checkpoint blockade(ICB)has achieved positive clinical responses in different cancer types,although its clinical efficacy remains limited in some patients.The main obstacle to inducing effective antitumor immune responses with ICB is the development of an immunosuppressive tumor microenvironment.Myeloid-derived suppressor cells(MDSCs),as major immune cells that mediate tumor immunosuppression,are intimately involved in regulating the resistance of cancer patients to ICB therapy and to clinical cancer staging and prognosis.Therefore,a combined treatment strategy using MDSC inhibitors and ICB has been proposed and continually improved.This article discusses the immunosuppressive mechanism,clinical significance,and visualization methods of MDSCs.More importantly,it describes current research progress on compounds targeting MDSCs to enhance the antitumor efficacy of ICB. | Hongchao Tang Hao Li Zhijun Sun | 2021 | Cancer Biology & Medicine2021，18，4： | 0 |
| 14 | Microstructural influences on the high cycle fatigue life dispersion and damage mechanism in a metastable β titanium alloy显示文摘In this work,the effect of microstructure features on the high-cycle fatigue behavior of Ti-7Mo-3Nb-3Cr-3Al(Ti-7333)alloy is investigated.Fatigue tests were carried out at room temperature in lab air atmosphere using a sinusoidal wave at a frequency of 120 Hz and a stress ratio of 0.1.Results show that the fatigue strength is closely related to the microstructure features,especially theα_(p) percentage.The Ti-7333 alloy with a lowerα_(p) percentage exhibits a higher scatter in fatigue data.The bimodal fatigue behavior and the duality of the S-N curve are reported in the Ti-7333 alloy with relatively lowerα_(p) percentage.Crack initiation region shows the compoundα_(p)/βfacets.Facetedα_(p) particles show crystallographic orientation and morphology dependence characteristics.Crack-initiation was accompanied by faceting process across elongatedα_(p) particles or multiple adjacentα_(p) particles.These particles generally oriented for basal slip result in near basal facets.Fatigue crack can also initiate at elongatedα_(p) particle well oriented for prismatic slip.Theβfacet is in close correspondence to{110}or{112}plane with high Schmid factor.Based on the fracture observation and FIB-CS analysis,three classes of fatigue-critical microstructural configurations are deduced.A phenomenological model for the formation ofα_(p) facet in the bimodal microstructure is proposed.This work provides an insight into the fatigue damage process of theβprecipitate strengthened metastableβtitanium alloys. | Zhihong Wu Hongchao Kou Nana Chen Zhixin Zhang Fengming Qiang Jiangkun Fan Bin Tang Jinshan Li | 2021 | Journal of Materials Science & Technology2021，，11： | 0 |
| 15 | Creep anisotropy behavior,deformation mechanism,and its efficient suppression method in Inconel 625 superalloy显示文摘Mill products,such as sheets,usually show obvious anisotropy in their mechanical properties,which greatly affects both their applications and workability.In this study,the orientation-dependent tensile and creep behaviors of Inconel 625 alloy sheets with weak local textures were systematically investigated at 650°C.The results showed that Inconel 625 superalloy exhibits nearly isotropic tensile properties;how-ever,obvious creep anisotropy appears when loading along different directions.Creep life in the rolling direction(150±5 h)was approximately 4.5 times longer than in the transverse direction(33±1 h).Se-vere creep anisotropy was found to be determined by two aspects:(i)the change in deformation mecha-nisms along the rolling direction(a combination of boundary sliding,dislocation slipping,and twinning)and the transverse direction(dislocation slipping).Stronger impingement of slip bands on grain bound-aries accelerated intergranular crack initiation and propagation during loading along the transverse direc-tion,which resulted in a short creep life.(ii)The differences in strain compatibility at grain boundaries(i.e.,creep loading along the transverse direction resulted in the initial grains forming strong Brass,Cu,and S textures).Creep cracks preferentially nucleated at the junctions between Cu/Brass texture grains,as these interfaces exhibit the worst strain compatibility(Luster-Morris parameter m≤0.22).Furthermore,pre-stress aging(PSA)treatment is proposed as an efficient method to suppress creep anisotropy.The discrepancy rate of creep life was found to be reduced by nearly 50%after PSA treatment. | Xudong Liu Jiangkun Fan Kai Cao Fulong Chen Ruihao Yuan Degui Liu Bin Tang Hongchao Kou Jinshan Li | 2023 | Journal of Materials Science & Technology2023，，2： | 0 |
| 16 | Effects of subgrain size and static recrystallization on the mechanical performance of polycrystalline material: A microstructure-based crystal plasticity finite element analysis显示文摘In this paper, the effects of subgrain size and static recrystallization on the mechanical performance of polycrystalline material were investigated using a microstructure-based crystal plasticity finite element(CPFE) model. Firstly, polycrystalline microstructures with different mean subgrain sizes were prepared using simple assumption based on experimental observations, and intermediate microstructures during static recrystallization(SRX) were simulated by a cellular automata model adopting curvature driven grain/subgrain growth mechanism. Then, CPFE method was applied to perform stress analysis of plane strain tension on these virtual microstructures. The results show that the subgrains inside pre-existing grains have an effect on the heterogeneity of the stress distributions. The average stress decreases with increasing the mean subgrain radius. As grain/subgrain grows during SRX, the average stress also decreases. It can be deduced that well-defined and finer subgrain structure may strengthen the polycrystalline material, while grain/subgrain growth during SRX process will degrade the strength. | Fengbo Han Bin Tang Hongchao Kou Jinshan Li Yong Feng | 2015 | Progress in Natural Science:Materials International2015，25，1： | 0 |
| 17 | Formation mechanism ofγtwins inβ-solidifedγ-TiAl alloys显示文摘Defects,such as stacking faults(SF)and twins,play a crucial role in stabilizing the order phase and improving the mechanical properties for engineering alloys.The formation mechanism of theγtwins from α_(2)-platelets within β_(0) areas was analyzed at atomic-scale by atomic-resolution high-angle annular dark-feld scanning transmission electron microscopy(HADDF-STEM).The growth faults(ABABCBC)were formed in α_(2)-platelets,yielding a local D0_(19)→L1_(0)(α_(2)→γ)phase transformation.During the annealing process,the growth faults can be rearranged intoγ(ABCABC)and γ^(T)(ACBACB)platelets via the slipping of Shockley partial dislocations 1/3[1010]and 1/3[1010],respectively.The γ and γ^(T) can merge intoγtwins by accident during growing.The interface steps between α_(2) and γ platelets implied that this transformation is a diffusion-controlled defect migration process.The present work provides profound insight towards the formation mechanism ofγtwins,contributing to microstructure controlling and performance improving for TiAl alloys. | Yan Liu Jinshan Li Bin Tang William Yi Wang Minjie Lai Lei Zhu Hongchao Kou | 2022 | Journal of Materials Science & Technology2022，，10： | 0 |
| 18 | The microstructure evolution and phase transformation behavior of aβ-solidifyingγ-TiAl alloy during creep显示文摘The microstructural evolution and creep behavior of the Ti-43.5Al–4Nb–1Mo-0.1B alloy have been investigated by scanning electron microscope(SEM)and transmission electron microscope(TEM).The excellent creep property was obtained with a fully lamellar(FL)microstructure containing the least grain boundaryβo phase(GB-βo).TEM results revealed that after creep testing theα_(2)→βo phase transformation was observed in the FL microstructure.The formationβo phase is associated with the accumulation of Mo element,which is confirmed by the energy-dispersive X-ray spectroscopy(EDS).Moreover,the formation ofβo precipitation inα_(2)lamellae effectively decreased the generation of dislocations in(α_(2)/γ)lamellae,thereby improving the creep resistance.For the near gamma(NG)microstructure of the as-forged sample,a large number of dislocations and dislocation tangles were observed in the globularγphase(γ-glob),which are considered to be the dominant creep mechanism.Moreover,the ellipsoidalωo phase was observed in the GB-βo phase,accompanying with dislocations and sub-boundaries formation.In sum,the excellent creep property of theβ-solidifyingγ-TiAl alloy is attributed to the fine FL structure with a small amount of GB-βo phase and the formation ofβo precipitation in(α_(2)/γ)lamellae. | Yan Liu Jinshan Li Bin Tang William Yi Wang Yudong Chu Lei Zhu Weiqing Bi Xiaofei Chen Hongchao Kou | 2023 | Progress in Natural Science:Materials International2023，33，2： | 0 |
| 19 | The activity of Zn precursors determines the cation exchange reaction kinetics with Ag_(2)S:Zn-doped Ag_(2)S or Ag_(2)S@ZnS QDs显示文摘Cation exchange(CE)has been emerged as a promising post-synthesis strategy of colloidal nanocrystals.However,it is unclear how the cation precursor affects the CE process and the final colloidal nanocrystals.Herein,we utilized two Zn-B Lewis acidbase adduct complexes(B=oleylamine(OAM)and methanol(MeOH))as Zn precursors for CE with Ag_(2)S quantum dots(QDs).Our study revealed that the steric hindrance and complexing capabilities of Zn precursor significantly affect the CE kinetics.As a result,the Zn-doped Ag_(2)S(Zn:Ag_(2)S)and Ag_(2)S@ZnS core–shell QDs were successfully obtained with enormous enhancement of their photoluminescence(PL)intensities.Theoretical simulation showed that the Zn-OAM with higher desolvation energy and spatial hindrance tended to form doped Zn:Ag_(2)S QDs due to the inefficient cation exchange.Whereas the Zn-MeOH with lower exchange barrier promoted the conversion of Ag-S to Zn-S,thus forming Ag_(2)S@ZnS core–shell QDs.We anticipate that this finding will enrich the regulatory approaches of post-synthesis of colloidal nanocrystals with desirable properties. | Zhiyong Tang Hongchao Yang Ziqiang Sun Yejun Zhang Guangcun Chen Qiangbin Wang | 2023 | Nano Research2023，16，10： | 0 |
| 20 | High-throughput investigations of configurational-transformation-dominated serrations in CuZr/Cu nanolaminates显示文摘Metallic amorphous/crystalline(A/C)nanolaminates exhibit excellent ductility while retaining their high strength.However,the underlying physical mechanisms and the resultant structural changes during plastic deformation still remain unclear.In the present work,the structure-property relationship of CuZr/Cu A/C nanolaminates is established through integrated high-throughput micro-compression tests and molecular dynamics simulations together with high-resolution transmission electron microcopy.The serrated flow of nanolaminates results from the formation of hexagonal-close-packed(HCP)-type stacking faults and twins inside the face-centered-cubic(FCC)Cu nano-grains,the body-centered-cubic(BCC)-type ordering at their grain boundaries,and the crystallization of the amorphous CuZr layers.The serration behavior of CuZr/Cu A/C nanolaminates is determined by several factors,including the formation of dense dislocation networks from the multiplication of initial dislocations that formed after yielding,weak-spots-related configurational-transitions and shear-transition-zone activities,and deformation-induced devitrification.The present work provides an insight into the heterogeneous deformation mechanism of A/C nanolaminates at the atomic scale,and mechanistic base for the microstructural design of self-toughening metallic-glass(MG)-based composites and A/C nanolaminates. | William Yi Wang Bin Gana Deye Lin Jun Wang Yiguang Wang Bin Tang Hongchao Kou Shunli Shang Yi Wang Xingyu Gao Haifeng Song Xidong Hui Laszlo J.Kecskes Zhenhai Xia Karin A.Dahmen Peter K.Liaw Jinshan Lia Zi-Kui Liu | 2020 | Journal of Materials Science & Technology2020，52，18： | 0 |
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