TEM investigation of twin intersection in a Ti-45Al-9Nb-2.5Mn alloy deformed at room temperature

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	TEM investigation of twin intersection in a Ti-45Al-9Nb-2.5Mn alloy deformed at room temperature
	G. L. Chen ; L. C. Zhang
刊名	Intermetallics
	2000
卷号	8 期号:5-6 页码:539-544
关键词	titanium aluminides based on TiAl twinning alpha(2)/gamma interfacial structure tial-based alloy ti-45al-10nb alloy deformation twins propagation
ISSN号	0966-9795
中文摘要	Three penetration mechanisms of the type-I twin intersection with the dislocation gliding atomic planes of (11(1) over bar)(TB), (001)(TB), and (115)(TB) respectively have been observed in a high-Nb containing TiAl base alloy by high resolution TEM. It was found that the active mode of those intersection mechanisms was related to the thickness of the incident twin (TI). When the TI is very thin such as 2-3 nm, the active intersection mode usually is the intersection mechanism with the dislocation gliding atomic planes of (11(1) over bar)TB; when the TI gets thick, the active intersection mode moves to the intersection mechanism with the gliding atomic planes of (001)TB; as the TI becomes thick enough such as 15 nm which is similar to the thickness of the barrier twin (TB), the active intersection mode changes to the intersection mechanism with the gliding atomic plane of (115)TB The observed thickness dependence indicates that active different twin intersection mechanisms need different local stress concentrations near the intersection boundary, which increases with increasing TI thickness. A twin intersection mainly includes two successive processes that are dislocation dissociation on the intersection boundary and the dislocation glides in the barrier twin. The local stress concentration needed to activate those intersection mechanisms is related to the difficulties of these two successive processes. The observed sequence in thickness dependence is consistent with the sequence in difficulty of those intersection mechanisms based on a detailed analysis of those two successive processes. (C) 2000 Elsevier Science Ltd. All rights reserved.
原文出处	://WOS:000087393800014
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/36989]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	G. L. Chen,L. C. Zhang. TEM investigation of twin intersection in a Ti-45Al-9Nb-2.5Mn alloy deformed at room temperature[J]. Intermetallics,2000,8(5-6):539-544.
APA	G. L. Chen,&L. C. Zhang.(2000).TEM investigation of twin intersection in a Ti-45Al-9Nb-2.5Mn alloy deformed at room temperature.Intermetallics,8(5-6),539-544.
MLA	G. L. Chen,et al."TEM investigation of twin intersection in a Ti-45Al-9Nb-2.5Mn alloy deformed at room temperature".Intermetallics 8.5-6(2000):539-544.