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Investigation of a New Type of Al3Ti-Based Ll2 Alloy With Second Phase Precipitation

Published online by Cambridge University Press:  22 February 2011

Gengxiang Hu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
Jian Sun
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
Xiaojun Weng
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
Tong Li
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
Shipu Chen
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
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Abstract

Since the L12 structured Al3Ti alloy exists only in a narrow compositional range, further alloying of the single phase Ll2 alloy to improve its property seems hardly successful. Developing two-phase or multiphase Al3Ti alloys may be an effective approach for strengthening and toughening. In this article, a new type of Al3Ti-based alloy which has a Ll2 matrix with precipitates of a second phase is reported. The quaternary alloys based on Al67Mn8Ti25, and modified with Nb additions, consist of an Ll2 matrix and DO22 second phase particles in the annealed state, but the second phase can be dissolved by solution treatment and precipitated during high temperature aging. Remarkable strenghtening and promising compressive ductility were exhibited by the experimental alloy. The influence of composition on the microstructure and properties of the alloys are reported also.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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