日本金属学会誌

J. Japan Inst. Metals, Vol. 56, No. 7 (1992),
pp. 741-746

Effect of Neutron Irradiation on Deformation Behavior of a Ti-Ni Shape Memory Alloy

Taiji Hoshiya1, Shoji Den2 and Hiroei Ando1

1Oarai Research Establishment, Japan Atomic Energy Research Institute, Oarai, Ibaraki
2Development and Research Laboratory, IRIE KOKEN Co., LTD., Kawagoe

Abstract:

Deformation behavior of Ti-Ni shape memory alloys at temperatures below 673 K and of those irradiated by neutrons and subsequently annealed at 473, 523 and 573 K, has been studied by tensile tests. From experimental results of the high temperature tensile test, work-hardening exponents of the irradiated specimens showed a maximum value near 523 K. It is presumed that the order-disoder transformation under irradiation is involved in this case, since that peak may be due to the strain-hardening associated with the ordering. The unusual tensile properties were restored by annealing at elevated temperatures above 523 K after irradiation. Irradiations at 520 K had almost no influences on those tensile properties. It is suggested that irradiation induced and thermally activated vacancies assist the thermal recovery through enhancement of the ordering processes.


(Received 1991/09/06)

Keywords:

shape memory effect, titanium-nickel alloy, martensitic transformation, post-annealing, work-hardening exponent, disordering, ordering, deformation behavior


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