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

Published online by Cambridge University Press:  16 February 2015

Zhenghao M. T. Chin ,
Norihiko L. Okamoto  and
Haruyuki Inui
Zhenghao M. T. Chin
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japn
Norihiko L. Okamoto
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japn
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japn
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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.

Keywords

Costrengthdislocations
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy05-37
Copyright
Copyright © Materials Research Society 2015 

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References

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