Effects of heating rates on microstructure and superplastic behavior of friction stir processed 7075 aluminum alloy

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	Effects of heating rates on microstructure and superplastic behavior of friction stir processed 7075 aluminum alloy
	K. Wang; F. C. Liu; P. Xue; B. L. Xiao; Z. Y. Ma
	2015
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	50 期号:2 页码:1006-1015
摘要	The effects of heating rate prior to tension on the microstructure and superplastic behavior of friction stir processed (FSP) 7075Al alloy, with an initial grain size of 6.2 mu m, were investigated. Under both slow and fast heating rates, the FSP specimens exhibited excellent grain stability without abnormal growth at elevated temperatures up to 535 degrees C. At temperatures lower than 500 degrees C, both specimens exhibited similar microstructure and superplastic behavior. At 535 degrees C, specimens heated via slow heating rate exhibited worse superplasticity compared with those heated by fast heating rate, because of significantly coarsened second-phase particles after high temperature exposure for a long time, which blocked grain boundary sliding during superplastic deformation and resulted in a premature fracture of specimens. It was identified that fast heating rate can prevent the particle coarsening and thus the grain growth during heating process effectively, thereby favoring obtaining an excellent superplasticity at elevated temperatures.
部门归属	[wang, k. ; liu, f. c. ; xue, p. ; xiao, b. l. ; ma, z. y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [wang, k.] chongqing univ, coll mat sci & engn, chongqing 400030, peoples r china. ; ma, zy (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china. ; zyma@imr.ac.cn
关键词	Strain Rate Superplasticity Mg-sc Alloy Grain-growth Cellular Microstructures Unified Theory Al-alloy Stability Deformation Temperature Recrystallization
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73412
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. Wang,F. C. Liu,P. Xue,et al. Effects of heating rates on microstructure and superplastic behavior of friction stir processed 7075 aluminum alloy[J]. Journal of Materials Science,2015,50(2):1006-1015.
APA	K. Wang,F. C. Liu,P. Xue,B. L. Xiao,&Z. Y. Ma.(2015).Effects of heating rates on microstructure and superplastic behavior of friction stir processed 7075 aluminum alloy.Journal of Materials Science,50(2),1006-1015.
MLA	K. Wang,et al."Effects of heating rates on microstructure and superplastic behavior of friction stir processed 7075 aluminum alloy".Journal of Materials Science 50.2(2015):1006-1015.