Effect of hydrogen on the elastic modulus and hardness of gamma titanium aluminides
- Forschungszentrum Juelich (Germany)
Gamma titanium aluminides or gammalloys are emerging as one of the potential candidate materials to be used in advanced power plants, aerospace and automobile industries particularly because of their high specific strength, elastic modulus and oxidation resistance at temperatures up to 700 C. Poor toughness and limited ductility of these materials have however restricted their usage in similar applications. In addition, it has been widely reported in literature that these materials also exhibit environmental embrittlement in the presence of hydrogen. Although there is no universal agreement about the effect of hydrogen on gammalloys, some general conclusions are that the solubility of hydrogen is greater in the {alpha}{sub 2} phase compared to the gamma phase and the formation of hydrides results in a decrease in the ductility of gamma titanium aluminides. In the present investigation, the effect of hydrogen on a first generation cast Ti-48Al-2Cr alloy and a second generation Ti-46.5Al-4(CR,Nb,Ta,B) gamma titanium aluminide-based sheet material was studied. The paper focuses on the influence of hydrogen on the elastic modulus and hardness of these materials.
- OSTI ID:
- 691358
- Journal Information:
- Scripta Materialia, Vol. 41, Issue 8; Other Information: PBD: 10 Sep 1999
- Country of Publication:
- United States
- Language:
- English
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