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Effect of Interstitial Carbon Atoms on Phase Stability and Mechanical Properties of E21 (L12) Ni3AlC1-x Single Crystals

Published online by Cambridge University Press:  25 January 2013

Yoshisato Kimura ,
Masato Kawakita ,
Hiroyasu Yuyama  and
Yaw-Wang Chai
Yoshisato Kimura
Affiliation:
Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, 4259-J3-19 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
Masato Kawakita
Affiliation:
Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, 4259-J3-19 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
Hiroyasu Yuyama
Affiliation:
Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, 4259-J3-19 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
Yaw-Wang Chai
Affiliation:
Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Department of Materials Science and Engineering, 4259-J3-19 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
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Abstract

Single crystals of E21 (L12) Ni3AlC1-x were prepared by the unidirectional solidification using the optical floating zone melting method to determine their mechanical properties. Particularly the effects of interstitial carbon atoms on mechanical properties were evaluated by compression tests at room temperature. Operative slip system of E21 Ni3AlC is {111}<011> type which is the same as that of L12 Ni3Al. Strength of Ni3AlC single crystals increases with carbon concentration due to the solid solution effect, though the stress relief of yielding behavior is enhanced at the intermediate carbon content at around 3at%. A large gap appears in the carbon concentration dependence of critical resolved shear stress (as well as yield stress) at almost the same carbon content. This discontinuity in strengthening is attributed to the interaction between multiple solute carbon atoms and mobile dislocations.

Keywords

crystal growthstrengthphase equilibria
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 243 - 248
Copyright
Copyright © Materials Research Society 2013 

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References

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