Investigation on the Microstructure Homogenization in a TiAl Based Alloy Prepared by Elemental Powder Metallurgy

Abstract

Abstract: A Ti-48Al (at. pct) alloy prepared by elemental powder metallurgy (EPM) has been heat treated under various conditions. Through optical and scanning electronic microscopy, EDAX, XRD analysis, and DTA, it was shown that the hot pressed microstructure consisted of α2-Ti3Al and TiAl phases. The α2-Ti3Al phase was island-like, and had a high stability and heredity in subsequent heat treatments. The supersaturation of Al in the island-likeα-Ti3Al phase strongly influenced the transformation of α (or α2) to α2/γ lamellar colonies. After a heat treatment at 1380℃ for 0.5 h and 1000℃ for 8 h, a fully lamellar microstructure with a colony size of 50 μm was obtained. This result indicates that a homogeneous composition and an equilibrium microstructure in EPM TiAl-base alloys can only be obtained after heat treatment at temperatures above α transus temperature (Tα).

Key words:

Yong LIU, Baiyun HUANG, Yuehui HE, Jiannong WANG. Investigation on the Microstructure Homogenization in a TiAl Based Alloy Prepared by Elemental Powder Metallurgy[J]. J Mater Sci Technol, 1999, 15(06): 527-530.

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Investigation on the Microstructure Homogenization in a TiAl Based Alloy Prepared by Elemental Powder Metallurgy

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