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On the reversibility of the α_(2)/ω_(o) phase transformation in a high Nb containing TiAl alloy during high temperature deformation

查看全文 作　　者：Lin [1]Song;Fritz [2]Appel;Andreas [2]Stark;Uwe [2]Lorenz;Junyang [3]He;Zhanbing [4]He;Junpin [4]Lin;Tiebang [1]Zhang;Florian [2]Pyczak 高影响力作者 机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Poly technical University.Xi'an 710072,China;[2]Institute of Materials Research,Helmholtz-Zentrum Geesthacht,Max Planck-Str.1,Geesthacht 21502,Germany;[3]Department of Microstructure Physics and Alloys Design,Max-Planck-lnsdtut fiir Eisenforschung GmbH,Dusseldorf 40237,Germany;[4]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第34期,共7页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(contract No.51971175);Natural Science Basic Research Plan of Shaanxi Province(contract No.2020JM-097);State Key Laboratory of Advanced Metals and Materials(contract No.2020-ZD03);Research Fund of State Key Laboratory of Solidification Processing(contract No.2021-TS-05);the'111' Project(contract No.B20028)。 摘　　要：The transformations between the phasesα_(2)(Ti_(3)Al)andω_(o)were investigated in a lamellar multiphase titanium aluminide alloy based onγ(TiAl).The paper complements an earlier investigation performed on the same material in which the importance of deformation-induced twin structures for theα_(2)→ω_(o) transformation was demonstrated.The present study shows that the reverse transformationω_(o)→α_(2) can also occur during high-temperature deformation.The transformation is probably triggered by constraint stresses,which exist between the different constituents due to the crystalline mismatch.The combined operation of mechanical twinning of theα_(2) phase and the reversible transformation fully converts theα_(2) lamellae into a mixture ofα_(2) andω_(o).This conversion greatly reduces the mechanical anisotropy existing in formerα_(2) lamellae.Regarding the technical use of the alloy,the stability of the converted structure with respect to further annealing was also examined.The reported processes occur at the nano-meter and sub nano-meter scale,thus,advanced characterization techniques were applied,such as high-resolution transmission electron microscopy(HRTEM)and atom probe tomography(APT). 关 键 词：TiAl alloys Phase transformation Electron microscopy MICROSTRUCTURE
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