Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates

doi:10.1016/j.jallcom.2016.12.041

IMECH-IR > 非线性力学国家重点实验室

	Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates
	Zhang WG; Ye YC; He LJ; Li PJ; Zhang HS(张虎生); Zhang, WG (reprint author), Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China.; Zhang, HS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
	2017
卷号	696 页码:1067-1079
ISSN	0925-8388
摘要	In this research, the mechanical behaviors of extruded AZ31B Mg plate along normal direction (ND) were investigated over a wide range of strain rates. High strain rate tests were carried out using a split Hopkinson pressure bar at room temperature. The corresponding deformation mechanisms, texture evolution and microstructure changes were analyzed by utilizing optical microscope (OM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). It is found that the mechanical responses exhibit both sigmoidal hardening and power-law hardening behaviors under compression at high strain rate ranges of 1068-5647 s(-1). The prismatic type textures of the skin layer and center layer of the AZ31B plate determine its mechanical behaviors. The sigmoidal hardening behaviors are resulted from the formation and development of {10-12} extension twinning at the initial stage of deformation. Whereas the power-law hardening behaviors are resulted from non-basal < c+a > dislocation slip dominated the deformation at the initial deformation stage. Experimental results indicate the critical resolved shear stress (CRSS) for extension twinning and non-basal < c+a > dislocation slip are insensitive to strain rate, but the latter CRSS is significantly higher than the former CRSS. The flow stress is insensitive to strain rate if plastic deformation is dominated by extension twinning, while it increases with the increase of strain rate if plastic deformation is dominated by nonbasal < c+a > dislocation slip. Dynamic recrystallization (DRX) took place if the AZ31B plate was compressed at strain ranges of 4737-5647 s(-1), resulting in a decrease in flow stress and a significant increase in ductility. (C) 2016 Elsevier B.V. All rights reserved.
关键词	Extruded Az31b Plate Gradient Texture Dynamic Mechanical Behavior Deformation Mechanism Microstructural Evolution
DOI	10.1016/j.jallcom.2016.12.041
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000391819800140
关键词[WOS]	Extruded AZ31B plate ; Gradient texture ; Dynamic mechanical behavior ; Deformation mechanism ; Microstructural evolution
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
项目资助者	National Natural Science Foundation of China [51471090]
课题组名称	LNM实验平台
论文分区	一类
力学所作者排名	1
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/59963
专题	非线性力学国家重点实验室
通讯作者	Zhang, WG (reprint author), Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China.; Zhang, HS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Zhang WG,Ye YC,He LJ,et al. Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,696:1067-1079.
APA	Zhang WG.,Ye YC.,He LJ.,Li PJ.,张虎生.,...&Zhang, HS .(2017).Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates.JOURNAL OF ALLOYS AND COMPOUNDS,696,1067-1079.
MLA	Zhang WG,et al."Dynamic mechanical response and microstructural evolution of extruded Mg AZ31B plate over a wide range of strain rates".JOURNAL OF ALLOYS AND COMPOUNDS 696(2017):1067-1079.

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