Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation

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	Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation
	Chen L(陈柳); Yuan FP(袁福平); Jiang P(姜萍); Xie JJ(谢季佳); Wu XL(武晓雷)
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2017-05-10
卷号	694 页码:98-109
关键词	Gradient structure Mechanical properties Tensile ductility Magnesium alloy
ISSN号	0921-5093
中文摘要	The surface mechanical attrition treatment was taken to fabricate the gradient structure in AZ31 magnesium alloy sheet. Microstructural investigations demonstrate the formation of dual gradients with respect to grain size and orientation where the microstructural sizes decreased from several microns to about 200 nm from center area to treated surface while the c-axis gradually inclined from being vertical to treated plane towards parallel with it. According to tensile results the gradient structured sample has yield strength of 305 MPa in average which is increased by about 4 times when compared with its coarse-grained counterpart. Meanwhile contrary to quickly failure after necking in most traditional magnesium alloys the failure process of gradient structure appears more gently which makes it has 6.5% uniform elongation but 11.5% total elongation. The further comparative tensile tests for separated gradient layers and corresponding cores demonstrate that the gradient structured sample has higher elongation either in uniform or in post-uniform stages. In order to elucidate the relationship between mechanical properties and deformation mechanisms for this dual gradient structure the repeated stress relaxation tests and pole figure examinations via X-ray diffraction were conducted in constituent gradient layer and corresponding core as well as gradient structured sample. The results show that the pyramidal dislocations in dual gradient structure are activated through the whole thickness of sample. Together with the contribution of grain-size gradient more dislocations are activated in dual gradient structure under tensile loading which results in stronger strain hardening and hence higher tensile ductility.
类目[WOS]	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	MAGNESIUM AZ31 ALLOY ; NONBASAL SLIP ; ULTRAHIGH-STRENGTH ; PURE MAGNESIUM ; DUCTILITY ; TEMPERATURE ; ANISOTROPY ; AUSTENITE ; SYSTEMS ; COPPER
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000401597300013
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/60554]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Chen L,Yuan FP,Jiang P,et al. Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2017,694:98-109.
APA	陈柳,袁福平,姜萍,谢季佳,&武晓雷.(2017).Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,694,98-109.
MLA	陈柳,et al."Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 694(2017):98-109.