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Interfacial strengthening by soft phase in lamellar microstructure of TiAl alloys

Journal Article


Abstract


  • The authors report a mechanism of interfacial strengthening during creep deformation of fully lamellar TiAl alloys. In the lamellar microstructure of TiAl alloys, the ��2 phase or the �� phase is softer than the �� phase at elevated temperature. Conventionally, the creep resistance increases with decreasing the volume fraction of the soft phases. However, the lamellar interfaces of �� ��2 or ���� retard the motion of dislocations during creep, causing a great strengthening, and thus the creep resistance increases with increasing the amount of the phase interfaces. In this study, a physically based model is developed to explain the strengthening behavior of the soft phases in lamellar TiAl alloys. �� 2007 American Institute of Physics.

Publication Date


  • 2007

Citation


  • Zhu, H., Maruyama, K., Seo, D. Y., & Au, P. (2007). Interfacial strengthening by soft phase in lamellar microstructure of TiAl alloys. Applied Physics Letters, 90(17). doi:10.1063/1.2733600

Scopus Eid


  • 2-s2.0-34248586510

Volume


  • 90

Issue


  • 17

Place Of Publication


Abstract


  • The authors report a mechanism of interfacial strengthening during creep deformation of fully lamellar TiAl alloys. In the lamellar microstructure of TiAl alloys, the ��2 phase or the �� phase is softer than the �� phase at elevated temperature. Conventionally, the creep resistance increases with decreasing the volume fraction of the soft phases. However, the lamellar interfaces of �� ��2 or ���� retard the motion of dislocations during creep, causing a great strengthening, and thus the creep resistance increases with increasing the amount of the phase interfaces. In this study, a physically based model is developed to explain the strengthening behavior of the soft phases in lamellar TiAl alloys. �� 2007 American Institute of Physics.

Publication Date


  • 2007

Citation


  • Zhu, H., Maruyama, K., Seo, D. Y., & Au, P. (2007). Interfacial strengthening by soft phase in lamellar microstructure of TiAl alloys. Applied Physics Letters, 90(17). doi:10.1063/1.2733600

Scopus Eid


  • 2-s2.0-34248586510

Volume


  • 90

Issue


  • 17

Place Of Publication