Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-20T01:20:47.602Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Lo, K.H., Shek, C.H., Lai, J.K.L., Mater. Sci. Eng. R, 65, 39 (2009).CrossRefGoogle Scholar
Sun, F-S., Cao, C-X., Yan, M-G., Kim, S-E., Lee, Y-T., Yan, M-G., Met. Mater. Trans. A, 32, 1573 (2003).CrossRefGoogle Scholar
Nakamura, H., Takeyama, M., Yamabe, Y., Kikuchi, M., Scripta Metall. Matter. 28, 997 (1993).CrossRefGoogle Scholar
Nakamura, H., Takeyama, M., Wei, L., Yamabe, Y., Kikuchi, M., 3rd Japan Intl. SAMPE Symp., Intermetallic Compounds for High-Temperature Structural Applications, Eds. By Yamaguchi, M. and Fukutomi, H., SAMPE, 1353 (1993).Google Scholar
Kobayashi, S., Doctoral Thesis (Tokyo Institute of Technology, 2002).Google Scholar
Kobayashi, S., Takeyama, M., Matsuo, T., Gamma Titanium Aluminide, TMS, 165 (2003).Google Scholar
Takeyama, M., Kobayashi, S., Intermetallics 13, 933 (2005).CrossRefGoogle Scholar
Kobayashi, S., Takeyama, M., Motegi, T., Hirota, N., Matsuo, T., Mater. Res. Soc. Symp. Proc. 753, 123 (2003).Google Scholar