Dynamic recrystallization and phase transformation behavior of a wroughtβ-γTiAl alloy during hot compression  

作　　者：Lei Zhu Jinshan Li Bin Tang Fengtong Zhao Ke Hua Shaopeng Yan Hongchao Kou 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Poytechnical University,127 Youyixri Road,Xian,710072,China [2]Shaanxi Key Laboratony of High-Performance Precision Forming Technology and Equiprment,Northwesterm Polytechrical Univesitoy,Xi'an,Shaaruci,710072,China

出　　处：《Progress in Natural Science:Materials International》2020年第4期517-525,共9页自然科学进展·国际材料（英文版）

基　　金：This work was financially supported by the Aeronautical Science Foundation of China(No.201936053001);the National Natural Science Foundation of China(No.51771150);the Natural Science Foundation of Shaanxi Province(2018JM5174);the Research Fund of the State Key Laboratory of Solidification Processing,NPU,China(Grant No.2019-TS-07).

摘　　要：The dynamic recrystallization(DRX)and phase transformation(PT)behavior of a wroughtβ-γTiAl alloy during hot compression under various deformation temperatures were investigated.The typical work hardening and flow softening features indicated that DRX was the dominating softening mechanism.Both y-DRX andβ-DRX took place during the hot compression.y-DRX was triggered at all compression temperatures,while theβ-DRX was induced when the compression temperature was above 1000℃.The hot deformation kinetics was calcu-lated,which showed that DRX behavior existed in the whole hot compression process,and the DRX volume fraction increased with the increase of the compression temperature.Combined with the microstructure ob-servation,it concluded that theβ/B2+a2-+y PT occurred at 850℃and 1000 C,while theγ-+β/B2 PT hap-pened at 1050℃during hot compression,which is important to optimize microstructure.Moreover,the hot compression mechanism changed from dislocation gliding to grain-boundary sliding was discussed.

关 键 词：β-γTiAl alloy Hot compression Dynamic recrystallization MICROSTRUCTURE Phase transformation 

分 类 号：TG146.23[一般工业技术—材料科学与工程]