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The effect of boron addition on brittle-to-ductile transition temperature and its strain rate sensitivity in gamma titanium aluminide

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Abstract

Temperature dependence of tensile properties ofTi–47Al–2Mn–2Nb–0.8TiB2 alloy was investigated andbrittle-to-ductile transition temperature (T BD) wasevaluated accordingly within the strain rate range from 10−5 to10−1 s−1. T BD and its strain rate sensitivity inTi-47Al-2Mn-2Nb-0.8TiB2 alloy were compared withthose in Ti-47Al-2Mn-2Nb alloy. It is found that theminor addition of 1.0 at% boron reduces T BD by more than100 K and that T BD in both alloys shows a positivesensitivity to the strain rate. But the B-doped alloy has a lower BDTactivation energy (256 kJ/mol) than that of B-free alloy(324 kJ/mol). The effect of boron on T BD and its strain ratesensitivity is attributed to the reduction in the grain size.

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Authors and Affiliations

  1. Open Laboratory of Education Ministry of China for High-Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, People's Republic of China

    Yu Wang

  2. Open Laboratory of Education Ministry of China for High-Temperature Materials and Tests, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200030, People's Republic of China

    Dongliang Lin

  3. Materials & Mechanics Engineering, United Technologies–Pratt & Whitney, East Hartford, Connecticut, 06108, USA

    Chi C. Law

Authors
  1. Yu Wang
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  2. Dongliang Lin
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  3. Chi C. Law
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Wang, Y., Lin, D. & Law, C.C. The effect of boron addition on brittle-to-ductile transition temperature and its strain rate sensitivity in gamma titanium aluminide. Journal of Materials Science 35, 3083–3087 (2000). https://doi.org/10.1023/A:1004886801436

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  • DOI: https://doi.org/10.1023/A:1004886801436

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