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Experimental Determination of the Ti-Nb-Al Phase Diagram At 1200°C.

Published online by Cambridge University Press:  26 February 2011

T. J. Jewett ,
J. C. Lin ,
N. R. Bonda ,
L. E. Seitzman ,
K. C. Hsieh ,
Y. A. Chang  and
J. H. Perepezko
T. J. Jewett
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
J. C. Lin
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
N. R. Bonda
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
L. E. Seitzman
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
K. C. Hsieh
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
Y. A. Chang
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
J. H. Perepezko
Affiliation:
University of Wisconsin-Madison, 1509 University Ave., Madison, sWI 53706.
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Abstract

Studies consisting of both bulk sample and diffusion couple experiments have been conducted in order to establish an isothermal section of the Ti-Nb-Al system. Bulk samples were prepared by arc-melting and then annealed in a gettered, flowing, argon atmosphere for extended equilibration periods. The results obtained so far have established the existence of two ternary phases with the following approximate compositions, TI (Ti-18 at% Nb-34 at% Al) and T2 (Ti-ll at% Nb-44 at% Al). Moreover, several of the binary phases were found to have extensive solubilities, including the TiAl phase. The phases TiAl3 and NbAl3 form a continuous solid solution. Several heterogeneous equilibria were also determined. Determination of these phase fields was accomplished through the use of electron microprobe analysis (EMPA), x-ray diffraction, microstructural observations and backscatter electron imaging (BEI).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 69
Copyright
Copyright © Materials Research Society 1989

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References

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