The Evolution of Strain Gradient and Anisotropy in Gradient-Structured Metal

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	The Evolution of Strain Gradient and Anisotropy in Gradient-Structured Metal
	Bian XD(卞祥德); Yuan FP(袁福平); Wu XL(武晓雷); Zhu, Yuntian ; Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
	2017
会议日期	FEB 26-MAR 02, 2017
会议地点	San Diego, CA
关键词	Severe Plastic-deformation Mechanical-properties Nanocrystalline Materials Tensile Ductility Maximum Strength Stainless-steel Bauschinger Alloys Copper
英文摘要	Gradient-structured metals have been reported to possess superior mechanical properties, which were attributed to their mechanical heterogeneity. Here we report in-situ observation of the evolution of strain gradient and anisotropy during tensile testing of a gradient-structured metal. Strain gradients and anisotropy in the lateral directions were observed to increase with increasing applied tensile strain. In addition, the equivalent Poisson's ratio showed gradient, which evolved with applied strain. The gradient structure produced higher deformation anisotropy than coarse-grained homogeneous structure, and the anisotropy increased with increasing tensile strain. The strain gradient and anisotropy resulted in strong back-stress hardening, large strain gradients, and a high density of geometrically necessary dislocations, which helped with increasing the ductility.
会议录	METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
资助机构	This work was financially supported by NSFC under Grant Nos. 11472286, 11572328, and 11672313, the 973 Program of China under Grant Nos. 2012CB932203 and 2012CB937500, and the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No. XDB22040503. Y.Z. was supported by the US Army Research Office (W911 NF-12-1-0009), the US National Science Foundation (DMT-1104667), and the Nanjing University of Science and Technology. This paper is dedicated to Professor Koch's TMS symposium 2017(Mechanical Behavior of Advanced Materials). This symposium will honor the outstanding contributions of Professor Carl C. Koch to many fields in materials science in the last 50 years and celebrate his 80th birthday.
会议录出版者	SPRINGER
会议录出版地	NEW YORK
语种	英语
WOS记录号	WOS:000406486700002
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/72166]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
作者单位	1.[Bian, Xiangde 2.Yuan, Fuping 3.Wu, Xiaolei] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 4.[Bian, Xiangde 5.Yuan, Fuping 6.Wu, Xiaolei] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China 7.[Zhu, Yuntian] Nanjing Univ Sci & Technol, Nano Struct Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China 8.[Zhu, Yuntian] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Bian XD,Yuan FP,Wu XL,et al. The Evolution of Strain Gradient and Anisotropy in Gradient-Structured Metal[C]. 见:. San Diego, CA. FEB 26-MAR 02, 2017.