Superplastic Deformation Behavior of As-Received and Hydrogenated Ti₂AlNb Alloy

Abstract:

In this paper, the effects of temperature and initial strain rate on the superplasticity of as-received Ti₂AlNb alloy were studied by uniaxial tensile tests. Temperature from 870°C to 1030°C with an interval of 40°C and initial strain rate range of 10^-2 s^-1 to 10^-4 s^-1 were selected. The optimal superplasticity of 190.3% was obtained at 990°C with initial strain rate of 10^-3s^-1. The superplastic properties were deteriorated at 1030°C due to serious grain coarsening. In order to improve superplastic properties, the as-received alloy was hydrogenated with different hydrogen contents. It was found that hydrogen addition can significantly decrease flow stress and increase elongation. A higher elongation occurs at 910°C in hydrogenated alloy.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 109-113
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.109
• Online since: July 2018
• Authors: Xi Feng Li*, Guo Peng Jia, Xu Dong Cao, Jun Chen, Guo Hong Wu
• Keywords: Hydrogenated, Superplastic Deformation, Ti₂AlNb Alloy

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