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Anomalous Temperature Dependence of Yield Stress and Work Hardening Coefficient of B2-Stabilized NiTi Alloys

Published online by Cambridge University Press:  15 February 2011

Hideki Hosoda ,
Yoshinao Mishima  and
Tomoo Suzuki
Hideki Hosoda
Affiliation:
Now with Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980, Japan.
Yoshinao Mishima
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, Japan.
Tomoo Suzuki
Affiliation:
Prof. Emeritus, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan.
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Abstract

Yield stress and work hardening coefficient of B2-stabilized NiTi alloys are investigated using compression tests. Compositions of NiTi alloys are based on Ni-49moJ.%Ti, to which Cr, Co and Al are chosen as ternary elements which reduce martensitic transformation temperatures of the B2 phase. Mechanical tests are carried out in liquid nitrogen at 77K, air at room temperature (R.T.) and in an argon atmosphere between 473K and 873K. Only at 77K, some alloys show characteristic stress-strain curves which indicate stress induced martensitic transformation (SIMT), but the others do not. Work hardening coefficient is found to be between 2 and 1 lGPa in all the test temperature range. The values are extremely high compared with Young's modulus of B2 NiTi. Yield stress and work hardening coefficient increase with test temperature between R.T. and about 650K in most alloys. The anomalous temperature dependence of mechanical properties is not related to SIMT but to precipitation hardening and/or anomalous dislocation motion similar to B2-type CoTi. Solution hardening by adding ternary elements is evaluated to be small for Cr and Co additions, and large for Al addition, depending on difference in atomic size of the ternary element with respect to Ni or Ti.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 635
Copyright
Copyright © Materials Research Society 1997

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References

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