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胥润润,李淼泉,李宏.γ-TiAl合金高温塑形变形力学行为及本构模型[J].稀有金属材料与工程(英文),2019,48(5):1406~1414.[Runrun Xu,Miqoquan Li and Hong Li.Flow Behavior and Constitutive Models of γ-TiAl Alloys Deformed at Elevated Temperature[J].Rare Metal Materials and Engineering,2019,48(5):1406~1414.]
Flow Behavior and Constitutive Models of γ-TiAl Alloys Deformed at Elevated Temperature
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Received:April 23, 2018  Revised:August 27, 2018
DOI:
Key words: γ-TiAl alloys  high temperature deformation  kinetic analysis  constitutive models
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Runrun Xu,Miqoquan Li and Hong Li  
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Abstract:
      γ-TiAl alloys with low density and high stiffness are preferred structural materials for weight saving of aircraft engines. The present paper deeply reviews flow behavior and constitutive equations of γ-TiAl alloys compressed at elevated temperature. Deformation processing parameters, deformation history and adjusted preheating treatment, chemical compositions and initial microstructures are main factors that determine flow behavior of γ-TiAl alloys compressed at elevated temperature. The constitutive models describing flow stress-strain curves are segmented into genres, such as empirical models, model coupled with different softening mechanisms and models about deformation mechanisms. Arrhenius model and H-S model are deeply discussed. Also, constitutive model including softening mechanism and models involving deformation mechanisms are summarized and analyzed. It predicts that emphasis on further research in γ-TiAl alloys is to establish constitutive models involving multiphase coordinating deformation mechanisms.