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

文献类型：期刊论文

作者Zhou, Zhichun1,2; Liu, Renci2; Shen, Yingying2; Liu, Yin1,2; Wang, Peng1,2; Cui, Yuyou2; Yang, Rui2
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期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
DOI10.1016/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
WOS记录号WOS:000844094900001
出版者ELSEVIER SCIENCE SA
资助机构CAS Project for Young Scientists in Basic Research ; National Natural Science Foundation of China
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.

入库方式： OAI收割

来源：金属研究所

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