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您的检索式：作者名="Chaolin Du"
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| 1 | Study of the intrinsic mechanisms of nickel additive for grain refinement and strength enhancement of laser aided additively manufactured Ti–6Al–4V显示文摘It is well-known that grain refiners can tailor the microstructure and enhance the mechanical properties of titanium alloys fabricated by additive manufacturing(AM). However, the intrinsic mechanisms of Ni addition on AM-built Ti–6Al–4V alloy is not well established. This limits its industrial applications. This work systematically investigated the influence of Ni additive on Ti–6Al–4V alloy fabricated by laser aided additive manufacturing(LAAM). The results showed that Ni addition yields three key effects on the microstructural evolution of LAAM-built Ti–6Al–4V alloy.(a) Ni additive remarkably refines the prior-β grains, which is due to the widened solidification range. As the Ni addition increased from 0 to 2.5 wt. %, the major-axis length and aspect ratio of the prior-β grains reduced from over 1500 μm and 7 to 97.7 μm and1.46, respectively.(b) Ni additive can discernibly induce the formation of globular α phase,which is attributed to the enhanced concentration gradient between the β and α phases. This is the driving force of globularization according to the termination mass transfer theory. The aspect ratio of the α laths decreased from 4.14 to 2.79 as the Ni addition increased from 0 to2.5 wt. %.(c) Ni as a well-known β-stabilizer and it can remarkably increase the volume fraction of β phase. Room-temperature tensile results demonstrated an increase in mechanical strength and an almost linearly decreasing elongation with increasing Ni addition. A modified mathematical model was used to quantitatively analyze the strengthening mechanism. It was evident from the results that the α lath phase and the solid solutes contribute the most to the overall yield strength of the LAAM-built Ti–6Al–4V–x Ni alloys in this work. Furthermore, the decrease in elongation with increasing Ni addition is due to the deterioration in deformability of the β phase caused by a large amount of solid-solution Ni atoms. These findings can accelerate the development of additively manufactured titanium alloys. | Shang Sui Youxiang Chew Fei Weng Chaolin Tan Zhenglin Du Guijun Bi | 2022 | International Journal of Extreme Manufacturing2022，4，3： | 1 |
| 2 | A triboelectric nanogenerator based oncosmetic fixing powder for mechanicalenergy harvesting显示文摘In this work,we use commercial powder particulates(a cosmetic fixing powder)as triboelectric materials for constructing a triboelectric nanogenerator(CFP-TENG).Through finger pressing,the CFP-TENG generated approximate open-circuit voltage,short-circuit current,and maximum power density values of 1141 V,521μA,and 570.96μW/cm^(2),respectively.Thirty-seven commercial blue LEDs can be easily lit up by the CFP-TENG.Moreover,this TENG,which was designed as a novel palette structure for harvesting mechanical energy from bicycle motion,serves as a self-powered bicycle speed sensor.In addition,the cosmetic fixing powder can be used as an effective material to enhance the triboelectric property of skin.This study provides an effective method for developing a cost-effective TENG without the use of complex surface micro-/nano-texturing. | Kequan Xia Yue Chi Jiangming Fu Zhiyuan Zhu Hongze Zhang Chaolin Du Zhiwei Xu | 2019 | Microsystems & Nanoengineering2019，5，1： | 0 |
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