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Flow Behavior and Constitutive Models of γ-TiAl Alloys Deformed at Elevated Temperature
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School of Material Science and Engineering,Northwestern Polytechnical University,Xi’an

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National Natural Science Foundation of China (No. 51505386); Fundamental Research Funds for the Central Universities (No. 3102017gx06003)

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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.

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[Runrun Xu, Miqoquan Li, 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.]
DOI:10.12442/j. issn.1002-185X.20180411

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History
  • Received:April 23,2018
  • Revised:August 27,2018
  • Adopted:August 30,2018
  • Online: June 04,2019
  • Published: