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Deformation Behavior And Internal Stress Of Icosahedral Al-Pd-Mn With Decagonal Phase Lamellae At Elevated Temperatures

Published online by Cambridge University Press:  10 February 2011

H. Hirai ,
T. Tomita ,
F. Yoshida  and
H. Nakashima
H. Hirai
Affiliation:
Kyushu National Industrial Research Institute, Tosu, Saga 841–0052, Japan, hirai@kniri.go.jp
T. Tomita
Affiliation:
Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816–0811, Japan
F. Yoshida
Affiliation:
Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816–0811, Japan
H. Nakashima
Affiliation:
Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816–0811, Japan
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Abstract

Fine decagonal phase lamellae-bearing icosahedral Al-Pd-Mn quasicrystals were tested compressionally at temperatures of 997 to 1073 K and initial strain rate of 3 × 10−5. to I × 10−4 S−1, and stress relaxation tests were performed at various stages of deformation. The results confirmed the thermally activated nature of deformation, and the stress exponent of strain rate was around 4. Internal stress for deformation estimated by Kikuchi's method reached 50 to 90 % of applied stress. The effective stress exponent of strain rate was revealed to be about 1.3. At least a part of high internal stress was attributable to complicated dislocation microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 331
Copyright
Copyright © Materials Research Society 1999

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References

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