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Effects of Alloying Elements on the Temperature Dependence of Yield Stress in L12-Co3(Al,W)

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Abstract

The effects of alloying elements (Ni/Ta) on the temperature dependence of yield stress in Co3(Al,W) with the L12 structure have been investigated through compression tests of nearly single-phase polycrystalline alloys in the temperature range between room temperature to 1,473K. Compared with a ternary Co3(Al,W), a Ni/Ta-added Co3(Al,W) alloy exhibits a higher γ’ solvus temperature and lower onset temperature of the yield stress anomaly (positive temperature dependence of yield stress), suggesting that the CSF energy is increased by Ni/Ta addition. As a consequence, the high-temperature strength in Co3(Al,W) is considerably enhanced.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Kyoto University, 606-8501, Sakyo-ku, Kyoto, Japan

    Zhenghao M. T. Chin, Norihiko L. Okamoto & Haruyuki Inui

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  1. Zhenghao M. T. Chin
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  2. Norihiko L. Okamoto
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  3. Haruyuki Inui
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Chin, Z., Okamoto, N. & Inui, H. Effects of Alloying Elements on the Temperature Dependence of Yield Stress in L12-Co3(Al,W). MRS Online Proceedings Library 1760, 25–30 (2014). https://doi.org/10.1557/opl.2015.161

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