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Phase transformation effects during hip of TiAl
Affiliation:1. Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;2. Southwest Institute of Physics, Chengdu 610064, China;1. School of Materials Science and Engineering, Guangxi University, Nanning, 530004, PR China;2. School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, PR China;3. Key Laboratory for Fuel Cell Technology in Guangdong Province, Guangzhou, 510641, PR China;4. China–Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China;1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;3. Xi’an Space Engine Company Limited, Xi’an, PR China
Abstract:The densification of titanium aluminide powders during hot isostatic pressing has been measured in situ by an eddy-current sensor. The samples were found to experience enhanced densification as they transformed from an initial metastable α2 structure to an equilibrium structure consisting mostly of the γ phase. The temperature at which the enhanced densification occurred corresponded closely to the temperature at which an exotherm is observed by differential thermal analysis. Evaluation of several possible explanations for this enhanced densification indicates that it is most probably the result of transformation plasticity.
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