Enhanced creep properties of Y2O3-bearing Ti-48Al-2Cr-2Nb alloys

被引：35
作者：
Guo, Yingfei [1 ,2 ]
Tian, Jing [1 ,2 ]
Xiao, Shulong [1 ,2 ]
Xu, Lijuan [1 ,2 ]
Chen, Yuyong [1 ,2 ,3 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China
[3] Panzhihua Univ, Panzhihua 617000, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 809卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; Y2O3; Creep behavior; Microstructure evolution; Strengthening mechanism; TIAL-BASED ALLOY; MICROSTRUCTURAL STABILITY; MECHANICAL-PROPERTIES; BEHAVIOR; CAST; PHASE; EVOLUTION; STRENGTH;
D O I：
10.1016/j.msea.2021.140952
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This study examined the influence of Y2O3 addition on the creep behavior of Ti-48Al-2Cr-2Nb alloy. Creep tests of Ti-48Al-2Cr-2Nb and Ti-48Al-2Cr-2Nb-0.05Y(2)O(3) alloys were performed under 275-325 MPa at 800 degrees C. The results show Y2O3 can significantly enhance the creep properties of the titanium aluminide (TiAl) alloys. Under applied stress, the creep rupture life can be increased three-fold with the addition of Y2O3 and the minimum creep rate drops by around one-third. Stress exponents of the TiAl alloy matrix and Y2O3-bearing alloy were found to be 6.77 and 4.49, respectively, suggesting creep is controlled by the dislocation climb mechanism. The excellent creep properties of the doped alloy can be attributed to the thin lamellar structures and dispersed second phases. The fine Y2O3 particles can impede dislocation climb and prevent sub-boundary formation. Microstructure instabilities occur in both alloys during creep exposure. Y2O3 particles accelerate recrystallization of gamma phases and precipitation of B2 phases. The combination of fine grains, increasing massive gamma phases and more precipitates in the Y2O3-bearing alloy may promote the development of cracks and cavities, leading to the low fracture strain.
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页数：9
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