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

IMR OpenIR

	Y Microstructural evolution and embrittlement of a beta-solidifying gamma-TiAl alloy during exposure at 700 degrees C
	Zhou, Zhichun 1,2; Liu, Renci 1; Shen, Yingying 1; Liu, Yin 1,2; Wang, Peng 1,2; Cui, Yuyou 1; Yang, Rui 1
通讯作者	Liu, Renci(rcliu@imr.ac.cn) ; Yang, Rui(ryang@imr.ac.cn)
	2022-09-05
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	852 页码:9
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.
关键词	TiAl alloy Thermal exposure Microstructural evolution Tensile properties Embrittlement
资助者	CAS Project for Young Scientists in Basic Research ; National Natural Science Foundation of China
DOI	10.1016/j.msea.2022.143704
收录类别	SCI
语种	英语
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
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000844094900001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：4[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/321006/174531
专题	中国科学院金属研究所
通讯作者	Liu, Renci; Yang, Rui
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230022, 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.