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
	1999
发表期刊	Journal of Electron Microscopy
ISSN	0022-0744
卷号	48 页码:1099-1106
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).
部门归属	chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;ye, hq (reprint author), chinese acad sci, inst met res, atom imaging solids lab, 72 wenhua rd, shenyang 110015, peoples r china
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
URL	查看原文
WOS记录号	WOS:000086579800017
引用统计	被引频次：13[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/321006/37555
专题	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.