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Phase Stability and High Temperature Tensile Properties of W doped gamma-TiAl

Published online by Cambridge University Press:  21 March 2011

Keizo Hashimoto ,
Hirohiko Hirata  and
Youji Mizuhara
Keizo Hashimoto
Affiliation:
Dept. of Materials Science & Eng. Teikyo University, Utsunomiya, 320–8551, JAPAN
Hirohiko Hirata
Affiliation:
Dept. of Materials Science & Eng. Teikyo University, Utsunomiya, 320–8551, JAPAN
Youji Mizuhara
Affiliation:
Advanced Technology Research Labs. Nippon Steel Corp., Hikari, 743–8510, JAPAN
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Abstract

Tungsten (W) doped γ-TiAl is one of promising alloys among many other proposed TiAl base alloys, for the purpose of structural applications at elevated temperatures. Ingots of W doped γ-TiAl were produced by plasma arc melting, followed by homogenizing heat treatment and isothermal forging to control their microstructures. The phase stability of W doped γ-TiAl has been studied quantitatively, using the specimens quenched from 1273 K. Equilibrium compositions of consisting phases were analyzed by means of EDS analysis in a TEM. An isothermal cross section of the Ti-Al-W ternary phase diagram at 1273K has been proposed based on the experimental observations. Small amounts of W addition (< 1at%) to Ti-48at%Al cause a phase shift from α2+γ to α2+β+γ, which suggests that W is the strongest β stabilizer among transition metals, such as Cr and Mo. Mechanical property measurements of W doped γ-TiAl show that the high temperature tensile strength has been improved by the W addition. Relationships between the microstructures and the mechanical properties of W doped γ-TiAl have been discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N7.8.1
Copyright
Copyright © Materials Research Society 2001

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References

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