Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C

doi:10.1016/j.msea.2022.143704

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	Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C
	Zhou, Zhichun 1,2; Liu, Renci 2; Shen, Yingying 2; Liu, Yin 1,2; Wang, Peng 1,2; Cui, Yuyou 2; Yang, Rui 2
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2022-09-05
卷号	852 页码:9
关键词	TiAl alloy Thermal exposure Microstructural evolution Tensile properties Embrittlement
ISSN号	0921-5093
DOI	10.1016/j.msea.2022.143704
通讯作者	Liu, Renci(rcliu@imr.ac.cn) ; Yang, Rui(ryang@imr.ac.cn)
英文摘要	The microstructural evolution and the room-temperature tensile properties of fully lamellar Ti-43.5Al-4Nb-1Mo-0.5B alloy exposed at 700 degrees C for 500 h in air were investigated. In bulk microstructure, the precipitation and growth of ellipsoidal omega(0) particles were found in equiaxed beta(0) grains, and the parallel decomposition of coarse alpha(2) lamellae into fine alpha(2) + gamma lamellar packets was observed. The alpha(2) lamellae near the surface decomposed first into fine alpha(2) + gamma lamellar packets and then blocky gamma grains after the full consumption of the alpha(2) phase. A mixed oxide scale with obvious stratification mainly composed of TiO2 and Al-2 O-3 formed on the surface of the specimens. The outward diffusion of Ti atoms on the specimen surface led to the formation of an Al-rich and Ti-lean blocky gamma zone between the matrix and the oxide scale. The degradation of room-temperature mechanical properties of the alloy after exposure was primarily caused by the evolution of subsurface microstructure, and the evolution of bulk microstructure had little effect on the mechanical properties at this stage. Under axial stress, microcracks nucleated from the tip of a V-shaped notch microstructure at the interface between the blocky gamma zone and the matrix, causing premature failure. Removal of the surface layer of the thermally exposed alloy led to room temperature mechanical properties essentially similar to those before thermal exposure.
资助项目	CAS Project for Young Scientists in Basic Research[YSBR-025] ; National Natural Science Foundation of China[51701209]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000844094900001
资助机构	CAS Project for Young Scientists in Basic Research ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/174530]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu, Renci; Yang, Rui
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230022, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Zhichun,Liu, Renci,Shen, Yingying,et al. Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,852:9.
APA	Zhou, Zhichun.,Liu, Renci.,Shen, Yingying.,Liu, Yin.,Wang, Peng.,...&Yang, Rui.(2022).Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,852,9.
MLA	Zhou, Zhichun,et al."Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 852(2022):9.