Deformation and phase transformation behaviors of a high Nb-containing TiAl alloy compressed at intermediate temperatures

作     者：Xu Liu Lin Song Andreas Stark Uwe Lorenz Zhanbing He Junpin Lin Florian Pyczak Tiebang Zhang Xu Liu;Lin Song;Andreas Stark;Uwe Lorenz;Zhanbing He;Junpin Lin;Florian Pyczak;Tiebang Zhang

作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China Institute of Materials ResearchHelmholtz-Zentrum GeesthachtMax Planck-Str.1Geesthacht 21502Germany State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第102卷第7期

页      面：89-96页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (No. 51971175) the Natural Science Basic Research Plan of Shaanxi Province (No. 2020JM-097) the State Key Laboratory of Solidification Processing (No. 2021-TS-05) the State Key Laboratory of Advanced Metals and Materials (No. 2020-ZD03) the “111” Project (No. B20028) 

主　　题：TiAl alloys Phase transformation Microstructure Electron microscopy 

摘      要：In modernβ-solidified TiAl alloys,the decomposition of α_(2) phase is frequently observed during heat treatment or high-temperature deformation of the *** this study,high-temperature deformation and decomposition mechanisms of α_(2) phase in a Ti-45Al-8.5Nb-0.2B-0.2W-0.02Y alloy are *** a sample deformed at 800℃,the precipitation ofβ_(o)(ω_(o))phase is observed within the equiaxed α_(2) *** nucleation ofω_(o) particles within theβ_(o) matrix indicates the α_(2)→β_(o)→ω_(o) *** addition,numerous y phase precipitates form within theβ_(o)(ω)*** α_(2) lamellae decompose into ultrafine( α_(2)+γ)lamellae and coarsened y lamellae via α_(2)→ α_(2)+γand α_(2)→γtransformation,***,theω_(o) phase nucleates within the ultrafine lamellae via α_(2)→ω_(o) ***,in a sample deformed at 1000℃,the nucleation ofβ_(o) particles is sluggish,which is caused by the efficient release of the internal stress via dynamic recrystallization(DRX).These results indicate that complex phase transformations can be introduced by the decomposition of α_(2) phase in TiAl alloys with a high amount ofβ-stabilizing elements.