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Phase Stability of β-Ti Phase in the TiAl Alloys with the Combined Addition of M Elements

Published online by Cambridge University Press:  24 February 2015

Hirotoyo Nakashima  and
Masao Takeyama
Hirotoyo Nakashima
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan
Masao Takeyama
Affiliation:
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan
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Abstract

Phase equilibria among the β-Ti, α-Ti and γ-TiAl phases were examined at 1473 K, in order to reveal the M/Nb ratio dependence of the relative phase stability of β phase in the Ti-Al-Nb-M (M: V, Cr, Mo) quaternary systems. In all of the quaternary systems, the expansion of β phase region toward the lower (Nb+M) content side is observed due to the existence of negative interaction to stabilize the β phase between the third and fourth elements (i.e. Nb-V, Nb-Cr and Nb-Mo). Composition dependence of the interaction is quantified as a function of the M/(Nb+M) ratio at 42 at.% Al. The strong interaction energy existing between the different group elements should be taken into account to design the multi-component TiAl alloys.

Keywords

structuralphase equilibriamicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy06-07
Copyright
Copyright © Materials Research Society 2015 

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References

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