Metadynamic recrystallization behavior of β-solidified TiAl alloy during post-annealing after hot deformation

被引：18

作者：

Tang, Bin ^{[1
,2
]}

Wang, William Yi ^{[1
]}

Xiang, Lin ^{[1
]}

Liu, Yan ^{[1
]}

Zhu, Lei ^{[1
]}

Ji, Shengli ^{[3
]}

He, Jian ^{[3
]}

Li, Jinshan ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Shaanxi Key Lab High Performance Precis Forming T, Xian 710072, Peoples R China

[3] Shaanxi Hongyuan Aviat Forging Ind Co Ltd, Sanyuan 713801, Peoples R China

来源：

INTERMETALLICS | 2020年 / 117卷

基金：

中国国家自然科学基金;

关键词：

intermetallics; annealing; Plastic deformation mechanisms; recrystallization and recovery; microstructure; electron backscatter diffraction; POST-DYNAMIC RECRYSTALLIZATION; TITANIUM ALUMINIDES; HIGH-NB; PHASE-TRANSFORMATION; MICROSTRUCTURE; WORKING; DESIGN; EVOLUTION; TRANSITION; KINETICS;

D O I：

10.1016/j.intermet.2019.106679

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：

The metadynamic recrystallization (MDRX) of beta-solidified TiAl alloy and its effects on microstructural homogeneity were investigated in the present work. Based on the comprehensive microstructure characterizations in terms of scanning electron microscope in back-scattered electron (BSE) mode and electron back scattered diffraction (EBSD) technique, it is found that the occurrence of MDRX during the post-annealing process after hot compression leads to the decomposition of lamellar colonies, grain equalization and reduction of geometrically necessary dislocation. The MDRX in present alloy during interpass annealing process has a hardening effect on the subsequent flow behavior, while it is restricted due to the phase transformation gamma to alpha when annealing at 1200 degrees C. Moreover, the occurrence of MDRX can reduce the microstructure heterogeneity among various areas induced by the different strains and stain rates, thus, to result in the microstructural homogenization. Through investigating the MDRX behavior, the present work supports important information for optimizing forged microstructure of TiAl alloys.

引用

页数：9

共 40 条

[1] Nano-scale design of TiAl alloys based on β-phase decomposition [J].