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High strain-rate behavior and deformation mechanism of a multi-layer composite textured AZ31B Mg alloy plate
Zhang WG; Liu S; Li K; Li PJ; Qi JF; Wang Z; Chen Y; Zhang HS(张虎生); Meng L
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
2018-06-15
卷号749页码:23-39
ISSN0925-8388
摘要There are currently very few studies on the high strain-rate properties of Mg alloys with multi-layer composite textures under dynamic loading. In present study, a multi-layer composite textured AZ31B Mg alloy plate was fabricated using the asymmetric twin-roll casting process. The high strain-rate (similar to 10(3) s(-1)) deformation behaviors of the AZ31B plate along the normal direction (ND) were investigated using split-Hopkinson pressure bar technique. The microstructural evolution and deformation mechanism were analyzed by optical microscopy, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy methods. The experimental results show that the mechanical behaviors exhibit a power-law hardening response under high strain-rate deformation. The flow stress generally increases with increasing strain rate, whereas the strain-hardening rate decreases with increasing strain. An interesting feature is that the maximum flow stress at high strain rates is much lower than that at its corresponding quasi-static counterpart. Microstructure analysis demonstrates that the characteristic layered texture and microstructure along the ND determine its mechanical behavior. The plastic deformation is mainly controlled by the basal-type texture, where the predominant deformation mechanism is dislocation slip. Dynamic recrystallization (DRX) occurred unevenly in the material during dynamic deformation, resulting in a moderate increase in ductility. The fracture behaviors change from brittle fracture to ductile fracture as the strain rate increases. The energy absorption capacity is therefore enhanced due to the occurrence of both DRX and the brittle-ductile transition at high strain rates. (C) 2018 Elsevier B.V. All rights reserved.
关键词Az31 b Mg Alloy Multi-layer Composite Textures High Strain Rate Twinning And Slip Energy Absorption Capacity
DOI10.1016/j.jallcom.2018.03.258
收录类别SCI ; EI
语种英语
WOS记录号WOS:000432666200003
关键词[WOS]MAGNESIUM ALLOY ; MICROSTRUCTURAL EVOLUTION ; DYNAMIC DEFORMATION ; PURE MAGNESIUM ; GRAIN-SIZE ; SHEET ; COMPRESSION ; TEMPERATURES ; MG-3AL-1ZN ; ANISOTROPY
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 (NSFC)(51471090)
论文分区一类
力学所作者排名5+
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77502
专题非线性力学国家重点实验室
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GB/T 7714
Zhang WG,Liu S,Li K,et al. High strain-rate behavior and deformation mechanism of a multi-layer composite textured AZ31B Mg alloy plate[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,749:23-39.
APA Zhang WG.,Liu S.,Li K.,Li PJ.,Qi JF.,...&Meng L.(2018).High strain-rate behavior and deformation mechanism of a multi-layer composite textured AZ31B Mg alloy plate.JOURNAL OF ALLOYS AND COMPOUNDS,749,23-39.
MLA Zhang WG,et al."High strain-rate behavior and deformation mechanism of a multi-layer composite textured AZ31B Mg alloy plate".JOURNAL OF ALLOYS AND COMPOUNDS 749(2018):23-39.
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