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Developing hydrogentolerant microstructures for an α2 titanium aluminide alloy

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Abstract

The feasibility of developing hydrogen-tolerant microstructures for α2 titanium aluminide alloys by heat treatment has been investigated. In particular, a variety of microstructures for the Ti-24Al-11Nb (in atomic percent) alloy was developed by manipulating the heat-treatment conditions. After screening by the Vicker hardness tests, three microstructures were evaluated for their resistance to hydrogen embrittlement by performing sustained load creep tests in a gaseous hydrogen environment at an elevated temperature, followed by post-creep, slow-rate tensile tests at room temperature. Tensile tests of hydrogen-exposed specimens without prior creep exposure were also performed. The results indicate that one particular microcstructure of the Ti-24Al-11Nb alloy is resistant to hydrogen embrittlement under the test conditions and hydrogen contents investigated, providing evidence that heat-treatment techniques can be used to develop hydrogentolerant microstructures for α2 titanium aluminide alloys.

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  1. Department of Materials and Mechanics, Southwest Research Institute, 78228-0510, San Antonio, TX

    Kwai S. Chan (Principal Engineer)

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  1. Kwai S. Chan
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Chan, K.S. Developing hydrogentolerant microstructures for an α2 titanium aluminide alloy. Metall Trans A 23, 497–507 (1992). https://doi.org/10.1007/BF02801167

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