Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility

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	Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility
	B. B. Sun; M. L. Sui; Y. M. Wang; G. He; J. Eckert; E. Ma
	2006
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	54 期号:5 页码:1349-1357
摘要	Ultrafine-grained (UFG) or nanostructured alloys usually lack the strain hardening capability needed to sustain uniform (tensile) deformation under high stresses. To circumvent this problem, we have designed a multi-phase composite microstructure in a Ti-based UFG alloy. The multi-component composition (Ti60Cu14Ni12Sn4Nb10) was chosen such that upon chill casting of the alloy the liquid underwent a metastable eutectic reaction, forming an in situ composite made of a inicrometer-sized dendritic Ti-based solid solution intermixed with a UFG eutectic matrix. Such a microstructure imparts a high strength in excess of those of commercial Ti alloys, and, more importantly, allows strain hardening at relatively high rates. As a result, uniform elongation in tensile deformation was observed at high flow stresses. We present extensive microscopy results to illustrate the dislocation pile-ups and the origin of the high strength, as well as the extensive dislocation interactions and interface crossing responsible for the obvious strain hardening sustained to large plastic strains. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china. johns hopkins univ, dept mat sci & engn, baltimore, md 21218 usa. shanghai jiao tong univ, dept mat sci & engn, shanghai 200030, peoples r china. tech univ darmstadt, div phys met, dept mt & geosci, d-64287 darmstadt, germany.;sui, ml (reprint author), chinese acad sci, met res inst, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, liaoning, peoples r china;mlsui@imr.ac.cn ema@jhu.edu
关键词	Ti Alloy Nanocomposite Mechanical Properties Microstructure Transmission Electron Microscopy Nanostructured Metal Grained Metals Nanocrystalline Deformation Cu Instabilities Mechanisms Behavior Fatigue
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WOS记录号	WOS:000235765300017
引用统计	被引频次：122[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34465
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	B. B. Sun,M. L. Sui,Y. M. Wang,et al. Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility[J]. Acta Materialia,2006,54(5):1349-1357.
APA	B. B. Sun,M. L. Sui,Y. M. Wang,G. He,J. Eckert,&E. Ma.(2006).Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility.Acta Materialia,54(5),1349-1357.
MLA	B. B. Sun,et al."Ultrafine composite microstructure in a bulk Ti alloy for high strength, strain hardening and tensile ductility".Acta Materialia 54.5(2006):1349-1357.