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The mechanism of critical strain and serration type of the serrated flow in Mg-Nd-Zn alloy
Wang, W. H.; Wu, D.; Shah, S. S. A.; Chen, R. S.; Lou, C. S.; dwu@imr.ac.cn; rschen@imr.ac.cn
2016
发表期刊MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
卷号649页码:214-221
摘要In present research the serrated flow has been observed successfully after a critical amount of strain. Two relationships between the critical strain and temperature i.e. normal and inverse, corresponding to each serration type were studied. In order to investigate systematically the onset of serrated flow and serration type in NZ31 alloy, samples in solutionized condition were tensile tested at the temperature ranging from 100 degrees C to 300 degrees C with the strain rate ranging from 1 x 10(-4) s(-1) to 1 x 10(-2) s(-1). Results showed that normal critical strain appeared with type A and B serrated flow at temperature from 150 degrees C to 250 degrees C, and inverse critical strain appeared with type Cat temperature from 275 degrees C to 300 degrees C. Through analyzing the mechanism of three serration types, we found that the production of serration required improvement in diffusion for solute atoms for pinning process at low temperature, and enhance the moving ability of dislocations for unpinning process at high temperature, which need the assistance of the strain and stress respectively. So, in this work, the critical strain for pinning and the critical stress for unpinning processes were defined, which give a better explanation to the variation tendency of two definitions in accordance with temperature. Furthermore, this relationship results in the critical strain for onset of serrated flow changing from normal to inverse and corresponding different serrations. (C) 2015 Elsevier B.V. All rights reserved.
部门归属[wang, w. h. ; wu, d. ; shah, s. s. a. ; chen, r. s.] chinese acad sci, inst met res, grp magnesium alloys & their applicat, shenyang 110016, peoples r china ; [wang, w. h. ; lou, c. s.] shenyang ligong univ, sch mat sci & engn, shenyang 110159, peoples r china
关键词Serrated Flow Magnesium Alloy Portevin-le Chatelier (Plc) Serration Type Critical Strain
资助者National Basic Research Program of China (973 Program) [2013CB632202]; National Natural Science Foundation of China (NSFC) [51105350, 51301173]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75199
专题中国科学院金属研究所
通讯作者dwu@imr.ac.cn; rschen@imr.ac.cn
推荐引用方式
GB/T 7714
Wang, W. H.,Wu, D.,Shah, S. S. A.,et al. The mechanism of critical strain and serration type of the serrated flow in Mg-Nd-Zn alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2016,649:214-221.
APA Wang, W. H..,Wu, D..,Shah, S. S. A..,Chen, R. S..,Lou, C. S..,...&rschen@imr.ac.cn.(2016).The mechanism of critical strain and serration type of the serrated flow in Mg-Nd-Zn alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,649,214-221.
MLA Wang, W. H.,et al."The mechanism of critical strain and serration type of the serrated flow in Mg-Nd-Zn alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 649(2016):214-221.
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