Microstructural stability and creep properties of middle Nb ?-TiAl alloy with a modulated microstructure

被引：7
作者：
Liu, Yan [1 ]
Tang, Bin [1 ,2 ]
Huang, Xiaoyu [2 ]
Zhu, Lei [1 ]
Liu, Dong [3 ]
Yang, Rui [3 ]
Li, Jinshan [1 ,2 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China
[3] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
INTERMETALLICS | 2022年 / 151卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloys; Creep property; O phase; TEM; Microstructure stability; IN-SITU SYNCHROTRON; AL-NB; PHASE-TRANSFORMATION; OMEGA(O) PHASE; BETA-PHASE; B19; PHASE; LAMELLAR; BEHAVIOR; DEFORMATION; EVOLUTION;
D O I：
10.1016/j.intermet.2022.107733
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, a modulated structure composed of nano-scale Ti2AlNb (O phase) and alpha 2 phase was obtained in middle Nb gamma-TiAl alloy. The O phase nucleates at the alpha 2/gamma interface and is orthogonal to the alpha 2/gamma interface. The creep testing results show that the modulated structure exhibited the better creep performance compared with the fully lamellar microstructure, manifesting in a smaller minimum creep rate and creep strain after creep for 200 h. The O phase in alpha 2 lamellae suppressed the alpha 2 ->gamma phase transformation and constructed the coherent interface with adjacent gamma lamellae, which replaced part of the semi coherent alpha 2/gamma interface, to reduce the generation of interfacial dislocation loops, thereby improving the creep resistance. Besides, discontinuous precipitations (DPs) caused by (alpha 2/gamma) -> beta 0(omega 0) + gamma phase transformation were observed in the crept samples, contributing to the microstructure degradation. The present work shows significant engineering significance and scientific value for improving the creep performance and microstructure stability for middle Nb-TiAl alloys.
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页数：9
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