Microstructure evolution and phase transformation of the mushy zone in a quenched β-solidifying TiAl alloy

被引：8

作者：

Zhang, Fuqiang ^{[1
]}

Ding, Xianfei ^{[2
]}

Xu, Leming ^{[1
]}

Feng, Xin ^{[2
]}

Nan, Hai ^{[2
]}

He, Jianping ^{[1
]}

Liang, Yongfeng ^{[1
]}

Lin, Junpin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Beijing Inst Aeronaut Mat, Cast Titanium Alloy R&D Ctr, Beijing 100095, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2024年 / 169卷

基金：

中国国家自然科学基金;

关键词：

Titanium aluminides; Mushy zone; Quenching; Electron backscattering diffraction; Phase transformation; TIAL/TI3AL LAMELLAR MICROSTRUCTURE; TRANSMISSION ELECTRON-MICROSCOPY; THERMAL STABILIZATION TREATMENT; DIRECTIONAL SOLIDIFICATION; VARIANT SELECTION; MASSIVE TRANSFORMATION; BETA-PHASE; NB ALLOYS; GAMMA; ALPHA;

D O I：

10.1016/j.jmst.2023.05.070

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the phase constitutions and transformations that occur in the mushy zone and in the adjacent phase fields of a directionally solidified Ti-44Al-8Nb-1Cr alloy via quenching technique. The results indicate that the mushy zone consists of unmelted & beta; dendrites and interdendritic liquid, whose formation can be attributed to the difference in melting point aroused by local heterogeneity in solutecontent. The & beta; dendrite is composed of numerous subgrains with various orientations. During quenching, the & beta; dendrite transforms into Widmanstatten & alpha; via a precipitation reaction, owing to the decreasing cooling rate caused by heat transfer from the surrounding liquid. Additionally, after quenching, the interdendritic liquid is transformed into & gamma; plates. Within the single & beta; phase field and the lower part of the mushy zone, a massive transformation of & beta; to & gamma; occurs . Conversely, in the & beta;-F & alpha; phase field, both & beta; and & alpha; phases are retained to ambient temperature. During the heating process, the transformation of & alpha; - & beta; gives rise to the formation of & beta; variants, which affects the orientation of & beta; dendrites in the mushy zone. The growth kinematics of the & alpha; - & beta; transformation was elucidated, revealing the preferential growth directions of ( 111 ) and ( 112 ) for & beta; variants. Furthermore, this study presents an illustration of the formation process of the mushy zone and the microstructural evolution during the heating and quenching process. & COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：28 / 41

页数：14

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