Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression

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	Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression
	Xu XB; Ling Z(凌中); Wu X(吴鑫); Bai YL(白以龙)
刊名	Journal of Materials Science & Technology
	2002
卷号	18 期号:6 页码:504-508
关键词	Al/Sicp Composites Shear Localization Recrystallization Dislocations Band Formation Deformation Recrystallization Alloy
ISSN号	1005-0302
通讯作者	Xu, XB (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
中文摘要	The localized shear deformation in the 2024 and 2124 Al matrix composites reinforced with SiC particles was investigated with a split Hopkinson pressure bar (SHPB) at a strain rate of about 2.0x10(3) s(-1). The results showed that the occurrence of localized shear deformation is sensitive to the size of SiC particles. It was found that the critical strain, at which the shear localization occurs, strongly depends on the size and volume fraction of SiC particles. The smaller the particle size, the lower the critical strain required for the shear localization. TEM examinations revealed that Al/SiCp interfaces are the main sources of dislocations. The dislocation density near the interface was found to be high and it decreases with the distance from the particles. The Al matrix in shear bands was highly deformed and severely elongated at low angle boundaries. The Al/SiCp interfaces, particularly the sharp corners of SiC particles, provide the sites for microcrack initiation. Eventual fracture is caused by the growth and coalescence of microcracks along the shear bands. It is proposed that the distortion free equiaxed grains with low dislocation density observed in the center of shear band result from recrystallization during dynamic deformation.
类目[WOS]	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	BAND FORMATION ; DEFORMATION ; RECRYSTALLIZATION ; ALLOY
收录类别	SCI
语种	英语
WOS记录号	WOS:000179670900007
公开日期	2009-08-03 ; 2010-06-13
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/33667]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Xu XB,Ling Z,Wu X,et al. Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression[J]. Journal of Materials Science & Technology,2002,18(6):504-508.
APA	Xu XB,凌中,吴鑫,&白以龙.(2002).Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression.Journal of Materials Science & Technology,18(6),504-508.
MLA	Xu XB,et al."Evolution of thermoplastic shear localization and related microstructures in Awl/SiCp composites under dynamic compression".Journal of Materials Science & Technology 18.6(2002):504-508.