Xinkun Zhu
Kunming University of Science and Technology
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Featured researches published by Xinkun Zhu.
Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science | 2017
Xianzhi Hu; Shenbao Jin; Hao Zhou; Zhe Yin; Jian Yang; Yulan Gong; Yuntian Zhu; G. Sha; Xinkun Zhu
Using surface mechanical attrition treatment (SMAT), a gradient structure composed of two gradient structure (GS) layers and a coarse grain (CG) layer was generated from a Cu-5.7xa0wt pct Ge alloy, significantly improving the yield strength of the sample. Unloading–reloading tests showed an unusual Bauschinger effect in these GS samples. The back stresses caused by the accumulated geometrically necessary dislocations (GNDs) on the GS/CG border increased with increasing strain. As found by electron backscatter diffraction (EBSD), the GNDs are mainly distributed in the gradient structured layer, and the density of the GNDs increase with increasing SMAT time. The effect of the back stress increased with increasing SMAT processing time due to the increase in the strain gradient. The pronounced Bauschinger effect in a GS sample can improve the resistance to forward plastic flow and finally contributes to the high strength of GS samples.
Journal of Materials Engineering and Performance | 2015
Yu Shen; Cuie Wen; Xincheng Yang; Yanzhao Pang; Lele Sun; Jingmei Tao; Yulan Gong; Xinkun Zhu
The purpose of this paper is to investigate the effect of dynamic recovery on the mechanical properties of copper (Cu) during surface mechanical attrition treatment (SMAT) at both room temperature (RT) and cryogenic temperature (CT). Copper sheets were processed by SMAT at RT and at CT for 5, 15, and 30xa0min, respectively. The Cu samples after SMAT at RT for 30xa0min exhibited better ductility but lower strength than the samples after SMAT at CT for 30xa0min due to dynamic recovery. X-ray diffraction analysis indicated that decreasing temperature during SMAT led to an increase in the twin and dislocation densities. In addition, a thicker gradient structure layer with finer grains was obtained in the SMAT-processed Cu samples at CT than at RT. The results indicated that SMAT at CT can effectively suppress the occurring of dynamic recovery and produce ultrahigh strength pure copper without seriously sacrificing its ductility.
Materials & Design | 2016
Zhe Yin; Xincheng Yang; Xiaolong Ma; Jordan Moering; Jian Yang; Yulan Gong; Yuntian Zhu; Xinkun Zhu
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2015
Xincheng Yang; Xiaolong Ma; Jordan Moering; Hao Zhou; Wei Wang; Yulan Gong; Jingmei Tao; Yuntian Zhu; Xinkun Zhu
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2015
Baozhuang Cai; Xiaolong Ma; Jordan Moering; Hao Zhou; Xincheng Yang; Xinkun Zhu
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2015
Jingmei Tao; Guangming Chen; Weiwei Jian; Jun Wang; Yuntian Zhu; Xinkun Zhu; Terence G. Langdon
Materials & Design | 2013
Chao Han; Yuncang Li; Xiaoxiang Wu; Shiying Ren; X.Y. San; Xinkun Zhu
Journal of Alloys and Compounds | 2010
K.Y. Zhao; Chao Li; Jingmei Tao; Dickon H. L. Ng; Xinkun Zhu
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2013
Shiying Ren; Cuie Wen; Xiaoxiang Wu; Yulan Gong; Yan Long; Lianping Cheng; Xinkun Zhu
Journal of Alloys and Compounds | 2016
Zhe Yin; Lele Sun; Jian Yang; Yulan Gong; Xinkun Zhu