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The Compression Creep Behavior of Ni3Al-X Single Crystals

Published online by Cambridge University Press:  26 February 2011

Seiji Miura ,
Tohru Hayashi ,
Mitsuhiro Takekawa ,
Yoshinao Mishima  and
Tomoo Suzuki
Seiji Miura
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Tohru Hayashi
Affiliation:
Graduate Student, Department of Materials Science and Engineering, TokyoInstitute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Mitsuhiro Takekawa
Affiliation:
Graduate Student, Department of Materials Science and Engineering, TokyoInstitute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Yoshinao Mishima
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Tomoo Suzuki
Affiliation:
Department of Metallurgical Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan
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Abstract

Compressive creep behavior is investigated in ternary Ni3Al single crystals containing Ti, Si, Hf and Cr with stress axes parallel to the crystallographic orientation near [001]. Then a comparison is made with the results of high temperature compression tests under a constant strain rate for the same orientation where plastic behavior is characterized by a distinct yield drop followed by steadystate deformation. It is found that the deformation mechanism for the two cases is identical, namely octahedral viscous flow being expressed by the state equation of the power-law type with a stress exponent of about 3 to 4. The effect of offstoichiometry on the creep resistance is then examined in Ni3(Al,5 at%Ti) alloys with different Ni concentrations. The results support the observation in the polycrystalline compound where the creep resistance increases with Ni concentration on both sides of stoichiometry exhibiting a discontinuity at stoichiometry. Finally, the apparent activation energy in the power-law type state equation for the steady state creep deformation is estimated for all the ternary alloys examined. They are in general in good agreement with that for diffusion of ternary elements in Ni3Al. However, the relative magnitude of the value can not simply be compared since the activation energy depends on deviations from stoichiometry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 623
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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