Amorphization by dislocation accumulation in shear bands

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	Amorphization by dislocation accumulation in shear bands
	Z. J. Lin; M. J. Zhuo; Z. Q. Sun; P. Veyssiere; Y. C. Zhou
	2009
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	57 期号:9 页码:2851-2857
摘要	Microcrystalline gamma-Y(2)Si(2)O(7) was indented at room temperature and the deformation microstructure was investigated by transmission electron microscopy in the vicinity of the indent. The volume directly beneath the indent comprises nanometer-sized grains delimited by an amorphous phase while dislocations dominate in the periphery either as dense slip bands in the border of the indent or, further away, as individual dislocations. The amorphous layers and the slip bands are a few nanometers thick. They lie along well-defined crystallographic planes. The microstructural organization is consistent with a stress-induced amorphization process whereby, under severe mechanical conditions, the crystal to amorphous transformation is mediated by slip bands containing a high density of dislocations. It is suggested that the damage tolerance of gamma-Y(2)Si(2)O(7), which is exceptional for a ceramic material, benefits from this transformation. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[lin, z. j.; zhuo, m. j.; sun, z. q.; zhou, y. c.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [lin, z. j.; zhuo, m. j.; sun, z. q.] chinese acad sci, grad sch, beijing 100049, peoples r china. [veyssiere, p.] off natl etud & rech aerosp, cnrs, lem, f-92322 chatillon, france.;zhou, yc (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;yczhou@imr.ac.cn
关键词	Dislocation Shear Bands Tem Ceramics Transmission Electron-microscopy Planar Deformation Features Plastic-deformation Silicon-nitride Nanostructured Materials Mechanical-properties Glass Transformation Metallic Materials Shocked Quartz Crystal
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WOS记录号	WOS:000266180300028
引用统计	被引频次：33[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/321006/32061
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. J. Lin,M. J. Zhuo,Z. Q. Sun,et al. Amorphization by dislocation accumulation in shear bands[J]. Acta Materialia,2009,57(9):2851-2857.
APA	Z. J. Lin,M. J. Zhuo,Z. Q. Sun,P. Veyssiere,&Y. C. Zhou.(2009).Amorphization by dislocation accumulation in shear bands.Acta Materialia,57(9),2851-2857.
MLA	Z. J. Lin,et al."Amorphization by dislocation accumulation in shear bands".Acta Materialia 57.9(2009):2851-2857.