HREM observation and compositional study of microstructure and phase transformation in TiAl-based and Cu-Al-Ni alloys

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	HREM observation and compositional study of microstructure and phase transformation in TiAl-based and Cu-Al-Ni alloys
	H. Q. Ye ; L. L. He ; R. Yu ; H. Y. Peng
刊名	Journal of Electron Microscopy
	1999
卷号	48 页码:1099-1106
关键词	synthetic analysis on a nanometer/an atomic scale characterization of microstructure TiAl intermetallics Cu-Al-Ni shape-memory alloy shape-memory alloys ti2al phase
ISSN号	0022-0744
中文摘要	Characterization of atomic configuration on an atomic scale is required for the development of advanced materials, as well as chemical compositions and electronic structures. In this paper, by using FEGTEM, studies of phase transformations and synthetic characterization of precipitated phase were carried out on a nanometer/an atomic scale in TiAl intermetallics and Cu-AlNi shape memory alloy, respectively. In TiAl intermetallics, a deformation-induced phase transformation at room temperature was observed on the several-ten-nanometer region in the Ti50Al48Cr2 alloy. It is a diffusionless phase transformation and a Ti3Al alpha(2) phase is formed as a metastable phase. On the other hand, a Ti2Al zeta phase was identified in another Al-rich TiAl with a composition of Ti48.3Al51.7 It was formed during the precipitation of Ti3Al alpha(2) plate in the TiAl gamma matrix. It was found that this precipitation was achieved through a two-step transition and Ti2Al zeta is an intermediate phase in the phase transformation. Characterization of chi particles was carried out in the shape memory Cu-Al-Ni alloy containing small amount of Ti and Mn. Many small precipitates of 18-100 nm in size were formed in the chi(L) phase. The composition of chi L phase was (NiAl)(2)CuTi, while the small precipitates were almost Cu-3(Al,Ni,Ti,Mn).
原文出处	://WOS:000086579800017
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37555]
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	H. Q. Ye,L. L. He,R. Yu,et al. HREM observation and compositional study of microstructure and phase transformation in TiAl-based and Cu-Al-Ni alloys[J]. Journal of Electron Microscopy,1999,48:1099-1106.
APA	H. Q. Ye,L. L. He,R. Yu,&H. Y. Peng.(1999).HREM observation and compositional study of microstructure and phase transformation in TiAl-based and Cu-Al-Ni alloys.Journal of Electron Microscopy,48,1099-1106.
MLA	H. Q. Ye,et al."HREM observation and compositional study of microstructure and phase transformation in TiAl-based and Cu-Al-Ni alloys".Journal of Electron Microscopy 48(1999):1099-1106.