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| 1 | Enhanced Strength and Ductility Due to Microstructure Refinement and Texture Weakening of the GW102K Alloy by Cyclic Extrusion Compression显示文摘The cyclic extrusion compression(CEC) was applied to severely deform the as-extruded GW102K(Mg–10.0Gd–2.0Y–0.5Zr, wt%) alloy at 350, 400, and 450 °C, respectively. The microstructure, texture, and grain boundary character distribution of the CECed alloy were investigated in the present work. The mechanical properties were measured by uniaxial tension at room temperature. The crack initiation on the longitudinal section near the tensile fracture-surface was investigated by high-resolution scanning electron microscopy(SEM). The result shows that the microstructure was dramatically refined by dynamic recrystallization(DRX). The initial fiber texture was disintegrated and obviously weakened. The 8-passes/350 °C CECed alloy exhibited yield strength of 318 MPa with an elongation-to-fracture of 16.8%, increased by 41.3% and 162.5%, respectively. Moreover, the elongation-to-fracture of the 8-passes/450 °C CECed alloy significantly increased more than 3 times than that of the received alloy. The cracks were mainly initiated at twin boundaries and second phase/matrix interfaces during tensile deformation. The microstructure refinement was considered to result in the dramatically enhanced of the strength and ductility. In addition, the texture randomization during CEC is beneficial for enhancing ductility. The standard positive Hall–Petch relationships have been obtained for the CECed GW102 K alloy. | Jinbao Lin Xinyi Wang Weijie Ren Xuexia Yang Qudong Wang | 2016 | Journal of Materials Science & Technology2016，32，8： | 9 |
| 2 | Microstructure and Mechanical Properties of Overcast 6101–6101 Wrought Al Alloy Joint by Squeeze Casting显示文摘The wrought Al alloy–wrought Al alloy overcast joint was fabricated by casting liquid 6101 Al alloy onto6101 Al extrusion bars and solidifying under applied pressure.The joint interfacial microstructure was investigated;the effect of applied pressure on the microstructure and mechanical properties was evaluated.The mechanism of joint formation and mechanical behaviors of both squeeze cast 6101 and 6101–6101 overcast joint material were analyzed.The results show that with the application of pressure during solidification process,wrought Al alloy 6101 could be cast directly into shape successfully.Excellent metallurgical bonding was then formed in the overcast joint by electro-plating 6101 solid insert with a layer of zinc coating,and a transition zone formed in the joint region.During the tensile test,the fracture occurs in the 6101 solid insert part with the ultimate tensile strength(UTS)of 200 MPa,indicating that the strength of the overcast joint is higher than 200 MPa,and the tensile strength of overcast joint material is independent on the magnitude of applied pressure.For Al–Al overcast joint material,if a clean and high strength joint is formed,the UTS and yield strength(YS)are determined by the material with the lower value,while for EL,the value is determined by the length proportion and the stress–strain behavior of both components. | Teng Liu Qudong Wang YudongSui Qigui Wang | 2016 | Journal of Materials Science & Technology2016，32，4： | 9 |
| 3 | Effects of Ho on the microstructure and mechanical properties of Mg-Zn-Ho-Zr magnesium alloys显示文摘The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail.The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho,and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries.These thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix during solution treatment,and the strengthening effect of solution-plus-ageing treatment weakened.The addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy,but the increase of high-temperature tensile strength was just a little. | LI Daquan WANG Qudong DING Wenjiang | 2011 | Rare Metals2011，30，2： | 8 |
| 4 | Strain Softening and Hardening Behavior in AZ61 Magnesium Alloy显示文摘The deformation behavior of AZ61 Mg alloy during hot deformation has been investigated in wide temperature and strain rate range by a Gleeble simulator. Specimens are deformed in compression in the temperature range of 523~673 K and at strain rates of 0.001~1 s-1. It is found that the flow curves exhibit a peak and then decrease towards steady-state of classical DRX, which decrease with rising temperature and decreasing strain rate. The deformation behavior of the specimens can be attributed to the occurrence of strain hardening and softening. As stress decreases, the strain hardening rate declines at a fast rate when temperature rises or strain rate decreases. The shapes of θ-σ curves indicate some important features such as subgrain formation, the critical stress, the peak stress and steady stress. The onset of DRX can be determined by the point of inflection on θ-σ or Inθ-σ curves. | Haitao ZHOU, Liufa LIU, Qudong WANG, Da LU, Xiaoqin ZENG and Wenjiang DINGNational Engineering Research Center of Light Alloys Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China | 2004 | Journal of Materials Science & Technology2004，20，6： | 7 |
| 5 | Effects of aging on the microstructures and mechanical properties of extruded AM50+xCa magnesium alloys显示文摘The effects of aging treatment on the microstructures and mechanical properties of extruded AM50 + xCa alloys (x = 0, 1, 2 wt.%) were studied. The results indicated the secondary phase Mg17Al12 precipitated from the saturated α-Mg solid solution while Al2Ca changed slightly when the aging time was increased. The hardness of extruded AM50 + xCa al-loys increased initially to its peak, and then dropped to reach its original hardness with the increase in aging time. With the increase in aging temperature, the hardness of the AM50 + 2Ca alloy decreased, whereas the hardness of AM50 and AM50 + 1Ca alloys decreased in the initial stages of aging treatment and increased in the later stages of aging treatment. The tensile strengths of AM50 and AM50 + 1Ca alloys increased after aging treatment for the precipitation of Mg17Al12 phase, which increases the resistance against dislocation movement at the grain boundary; with increase in aging temperature, their tensile strengths in-creased. For AM50 + 2Ca alloy, the tensile strength declined after aging at 150°C and 175°C, while it increased slightly at 200°C. The ductility of AM50 + xCa alloys (x = 0, 1, 2 wt.%) declined after aging treatment. | WANG Qudong PENG Jianguo Suéry Michel Jean-Jacques Blandin | 2006 | Rare Metals2006，25，4： | 6 |
| 6 | High strain rate superplasticity of rolled AZ91 magnesium alloy显示文摘The high strain rate superplastic deformation properties and characteristics of a rolled AZ91 magnesium alloy at temperatures ranging from 623 to 698 K(0.67Tm-0.76Tm) and high strain rates ranging from 10-3 to 1 s-1 were investigated.The rolled AZ91 magnesium alloy possesses excellent superplasticity with the maximum elongation of 455% at 623 K and a strain rate of 10-3 s-1,and its strain rate sensitivity m is high up to 0.64.The dominant deformation mechanism responsible for the high strain rate superplasticity is still grain boundary sliding(GBS),and the dislocation creep mechanism is considered as the main accommodation mechanism. | WANG Qudong WEI Yinhong Y. Chino M. Mabuchi | 2008 | Rare Metals2008，27，1： | 6 |
| 7 | Effects of Zr,Ti and Sc additions on the microstructure and mechanical properties of Al-0.4Cu-0.14Si-0.05Mg-0.2Fe alloys显示文摘The evolution of microstructure and mechanical properties of Al-0.4 Cu-0.14 Si-0.05 Mg-0.2 Fe(wt.%)alloys, micro-alloyed with Zr, Ti and Sc, were investigated. The addition of 0.2%Zr to base alloy accelerates the precipitation of Si-rich nano-phase in α-Al matrix, which plays an important role in improving the mechanical properties of an alloy. The tensile strength increases from 102 MPa for the base alloy to 113 MPa for the Zr-modified alloy. Adding 0.2%Zr + 0.2%Ti to base alloy effectively refines a-Al grain size and accelerates the precipitation of Si and Cu elements, leading to heavy segregation at grain boundary.By further adding 0.2%Sc to Zr + Ti modified alloy, the segregation of Si and Cu elements is suppressed and more Si and Cu precipitates appeared in α-Al matrix. Accompanied with the formation of coherent Al_3Sc phase, the tensile strength increases from 108 MPa for the Zr + Ti modified alloy to 152 MPa for the Sc-modified alloy. Due to excellent thermal stability of Al_3Sc phase, the Sc-modified alloy exhibits obvious precipitation hardening behavior at 350℃, and the tensile strength increases to 203 MPa after holding at 350 ℃ for 200 h. | Jian Feng Bing Ye Lijie Zuo Ruijuan Qi Qudong Wang Haiyan Jiang Rong Huang Wenjiang Ding Jie Yao Chuntao Wang | 2018 | Journal of Materials Science & Technology2018，34，12： | 3 |
| 8 | Tensile and Isothermal Fatigue Behaviors of Mg-12Gd-3Y-0.5Zr Alloy at High Temperature显示文摘Tensile and isothermal fatigue tests were carried out on an as-rolled Mg-12Gd-3Y-0.5Zr alloy and its heat-treated counterpart at different temperatures. The experimental results show that the ultimate tensile strengths of two alloys decrease very slowly with increasing temperature up to 200?C. The ultimate tensile strength of heat-treated Mg-12Gd-3Y-0.5Zr is slight lower than that of as-rolled counterpart; however, the fatigue strength of heat-treated alloy is higher. The mechanism of fatigue failure was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It shows that cyclic slip combined with environmental effect may be the main crack initiation mechanism. | Xiaoming Yang Huajie Yang Fan Yang Shuming Yin Wei Wang Shouxin Li Qudong Wang | 2009 | Journal of Materials Science & Technology2009，25，6： | 2 |
| 9 | Effects of Gd Addition on the Microstructure and Tensile Properties of Mg–4Al–5RE Alloy Produced by Three Different Casting Methods显示文摘This work deals with the effect of 0.67 wt%Gd addition on the microstructure and tensile properties of Mg–4 Al–5 RE(where RE represents La–Ce mischmetal)alloy produced by sand casting(SC),permanent mold casting(PMC),and high-pressure die casting(HPDC).The results show that Gd addition could refine the grains,but its efficiency decreases by increasing the cooling rate due to the shifting from SC to PMC and finally to the HPDC method.Meanwhile,the acicular Al11 RE3 phase is modified into the short-rod or granular-like shape under the three casting conditions.Such refined and modified microstructures are due to the Al2(Gd,RE)phases,which act as the nucleation sites in both theα-Mg matrix and Al11 RE3 phase.Also,the weakening grain refinement effect in the increased cooling rates can be attributed to the narrow constitutional undercooling zone.After Gd addition,the 0.2%proof strength of the SC and PMC alloys increases by about 16.9%and 12.7%,respectively,while in the HPDC alloy,it decreases by about 5.9%.The main factor in the strength increment of the SC and PMC alloys is the grain boundary strengthening due to grain refinement which is proved by modeling the related mechanisms,whereas weak secondary phases and grain boundary strengthening mechanisms in the HPDC alloy lead to strength reduction.After Gd addition,the elongation to failure of the SC,PMC,and HPDC alloys is significantly enhanced by about 34.8%,20.2%,and 12.3%,respectively,due to the crack resistance nature of the modified short-rod/granular Al11(RE,Gd)3 phase compared to the acicular one. | Jie Wei Qudong Wang Li Zhang Mahmoud Ebrahimi Haiyan Jiang Wenjiang Ding | 2021 | Acta Metallurgica Sinica(English Letters)2021，34，10： | 2 |
| 10 | Effects of rare earths on the microstructure properties and fracture behavior of Mg-Al alloys显示文摘 | Lu Yizhen Wang Qudong Zeng Xiaoqin | | 0，，1： | 1 |
| 11 | High temperature deformation behavior of permanent casting AZ91 alloy with and without Sb addition显示文摘 | Yuan Guangyin Wang Qudong Ding Wenjiang | 2002 | Journal of Materials Science2002，，1： | 1 |
| 12 | Effects of Ca addition on the microstructure and mechanical properties of AZ91magnesium alloy 显示文摘 | Wang Qudong Chen Wenzhou Zeng Xiaoqin | 2001 | Journal of Materials Science2001，36，30： | 1 |
| 13 | Study on the fluidity of AZ91-xRE magnesium alloy 显示文摘 | Wang Qudong Lu Yizhen Zeng Xiaoqin | 1999 | Materials Science and Engineering A1999，271，： | 1 |
| 14 | Effects of extrusion ratio on the microstructure and mechanical properties of AZ31 Mg alloy 显示文摘 | Chen Yongjun Wang Qudong Peng Jianguo | 2007 | Journal of Materials Processing Technology2007，182，123： | 1 |
| 15 | Effects of Ca addition on the microstructure and mechanical properties of AZ91 magnesium alloy显示文摘 | Wang Qudong Chen Wenzhou Zeng Xiaoqin | 2001 | Journal of Materials Science2001，36，： | 1 |
| 16 | Effects of RE on Microstructure and Properties of AZ91 Magnesium alloy显示文摘 | Wang Qudong Lu Yizhen Zeng Xiaoqin | | 0，，02： | 1 |
| 17 | Effect of Nd and Y addition on microstrueture and mechanical properties of as-cast Mg-Zn-Zr alloy 显示文摘 | Li Qiang Wang Qudong Wang Yingxin et ol | 2007 | Journal of Alloys and Compounds2007，427，： | 1 |
| 18 | Effects of strontium and titanium on the microstructure, tensile properties and creep behavior of AM50 alloys显示文摘 | Zhao Peng Wang Qudong Zhai Chunquan | 2007 | Materials Science and Engineering A2007，444，12： | 1 |
| 19 | Microstructural refinement and homogenization of Mg–SiC nanocomposites by cyclic extrusion compression显示文摘 | Wei Guo Qudong Wang Bing Ye Xiaochun Li Xintao Liu Hao Zhou | 2012 | Materials Science & Engineering A2012，，： | 1 |
| 20 | Effects of Zn and RE additions on the solidification behavior of Mg-9Al magnesium alloy显示文摘 | Yeshuang Wang Qudong Wang Chunjiang Ma | 2003 | Materials Science and Engineering2003，342，： | 1 |
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