Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion

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	Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion
	M. Demirtas; G. Purcek; H. Yanar; Z. J. Zhang; Z. F. Zhang
	2015
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	623 页码:213-218
摘要	Multi-pass equal-channel angular extrusion/pressing (ECAE/P) was applied to the eutectic Zn-5Al alloy to achieve high strain-rate (HSR) superplasticity in that alloy at room temperature (RT) by producing ultra-fine- grained (UFG) microstructure. ECAE processing transformed the coarse-grained lamellar/spherical microstructure into a unique bimodal structure having equiaxed Zn-rich eta-phase with a mean grain size of 540 nm and spherical Al-rich a-phase with an average grain size of 110 nm. The alpha-phase particles accumulated mainly along the eta-phase boundaries. This unique microstructure brought about an extraordinary improvement in HSR superplasticity of the alloy even at RT. While the strength values decreased after ECAE, the elongation to failure increased substantially. The maximum elongation was 520% at the strain rate of 10(-3) s(-1), still high elongation of about 400% was achieved at a high strain rate of 10(-2) s(-1). This extraordinary improvement in HSR superplasticity of Zn-5Al alloy was attributed to the morphologically unique bimodal microstructure in UFG regime formed after ECAE. The grain boundary sliding (GBS) was found to be the main deformation mechanism for this alloy in superplastic regime. (C) 2014 Elsevier B.V. All rights reserved.
部门归属	[demirtas, m.] bayburt univ, dept mech engn, tr-69000 bayburt, turkey. [purcek, g. ; yanar, h.] karadeniz tech univ, dept mech engn, tr-61080 trabzon, turkey. [zhang, z. j. ; zhang, z. f.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; purcek, g (reprint author), karadeniz tech univ, dept mech engn, tr-61080 trabzon, turkey. ; purcek@ktu.edu.tr
关键词	High Strain Rate Superplasticity Zn-al Alloys Ultrafine-grained Microstructure Zn-22-percent Al-alloy Deformation-behavior Eutectoid Alloy Seismic Damper Microstructure Microscopy Mechanism Evolution Metals Flow
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/321006/73210
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. Demirtas,G. Purcek,H. Yanar,et al. Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion[J]. Journal of Alloys and Compounds,2015,623:213-218.
APA	M. Demirtas,G. Purcek,H. Yanar,Z. J. Zhang,&Z. F. Zhang.(2015).Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion.Journal of Alloys and Compounds,623,213-218.
MLA	M. Demirtas,et al."Achieving room temperature superplasticity in Zn-5Al alloy at high strain rates by equal-channel angular extrusion".Journal of Alloys and Compounds 623(2015):213-218.