Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite

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	Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite
	K. B. Kim; J. Das; W. Xu; Z. F. Zhang; J. Eckert
	2006
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	54 期号:14 页码:3701-3711
摘要	Systematic investigations of the microstructural changes upon compression have been performed in order to elucidate the microscopic deformation mechanisms of the high-strength and ductile Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite. After 8% deformation, a rotation of beta-Ti dendrites is observed during the interaction of slip and shear bands. This rotation leads to the formation of new slip bands in the dendrites. The beta-Ti dendrites locally transform into omega phase during the interaction between the newly and the previously formed slip bands. The rotation of the dendrites causes local volume changes at the interfacial areas between the dendrites and the matrix, consisting of a mixture of hexagonal close-packed alpha-Ti and body-centered tetragonal Ti2Cu phases. This induces a rotational stress into the nanostructured matrix. After further deformation up to 25%, the shear bands penetrate the dendrite/matrix interfaces, producing extra interfaces. The nanostructured matrix exhibits a sandwiched microstructure in order to accommodate effectively the shear strains. These results suggest that structural coherency of the dendrite/matrix interfaces is important for controlling both the strength and the ductility of the nanostructure-dendrite composite. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	sejong univ, dept adv mat engn, seoul 143747, south korea. tech univ darmstadt, fb mat & geowissensch 11, fg phys met kunde, d-64287 darmstadt, germany. leibniz inst festkoper & werkstoffforsch, d-01069 dresden, germany. univ melbourne, dept mech & mfg engn, melbourne, vic 3010, australia. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china.;kim, kb (reprint author), sejong univ, dept adv mat engn, 98 gunja dong, seoul 143747, south korea;k.b.kim@phm.tu-darmstadt.de
关键词	Plastic Deformation Compression Test Transmission Electron Microscopy Phase Transformation Nanocomposite Induced Omega-phase Enhanced Plasticity Ductile Dendrites Nb Alloys Microstructure Shear
URL	查看原文
WOS记录号	WOS:000240171400007
引用统计	被引频次：93[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/321006/34286
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	K. B. Kim,J. Das,W. Xu,et al. Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite[J]. Acta Materialia,2006,54(14):3701-3711.
APA	K. B. Kim,J. Das,W. Xu,Z. F. Zhang,&J. Eckert.(2006).Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite.Acta Materialia,54(14),3701-3711.
MLA	K. B. Kim,et al."Microscopic deformation mechanism of a Ti66.1Nb13.9Ni4.8Cu8Sn7.2 nanostructure-dendrite composite".Acta Materialia 54.14(2006):3701-3711.