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Influence of Deformation Speed on Fatigue and Tensile Properties of a Ti-Ni-Cu Shape Memory Alloy

Published online by Cambridge University Press:  15 February 2011

Y Kishi ,
Z. Yajima ,
K Shimizu  and
M. Asai
Y Kishi
Affiliation:
AMS R & D Center, Kanazawa Institute of Technology, 3-1 Yatsukaho, Matto, Ishikawa 924-0838, JAPAN, [email protected]
Z. Yajima
Affiliation:
AMS R & D Center, Kanazawa Institute of Technology, 3-1 Yatsukaho, Matto, Ishikawa 924-0838, JAPAN, [email protected]
K Shimizu
Affiliation:
AMS R & D Center, Kanazawa Institute of Technology, 3-1 Yatsukaho, Matto, Ishikawa 924-0838, JAPAN, [email protected]
M. Asai
Affiliation:
Materials Research Center, The Furukawa Electric Co., LTD., 2-4-3 Okano, Nishi-ku, Yokohama 220-0073, JAPAN
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Abstract

The mechanical fatigue life and tensile property of a Ti-41at.%Ni-8.5at.%Cu alloy, which was solution-treated after some thermo-mechanical treatments, were investigated at 370±1 K as a function of deformation speed. The tensile properties were also investigated at 295±1 K as a function of deformation speed. The B2→B19 martensitic transformation start temperature, Ms, of the alloy was determined to be 338 K by a differential scanning calorimetry, while that of the as-rolled alloy could not be determined. Two types of fatigue tests were carried out by using plate-shaped specimens of 3.5 mm width and 1.5 mm thickness with sinusoidal waveform stresses of 20 Hz and 0.5 Hz frequencies being applied respectively. The fatigue life obtained from the 20 Hz tests was superior to that from the 0.5 Hz tests, the former being about 2 times longer than the latter at the same stress level. Tensile tests were performed at three tensilem speeds of 8.3 × 106, 8.3 × 10−5 and 8.3 × 10−3 m/s. In all the stress - strain curves obtained, an apparent yielding was observed after the liner elastic deformation. The apparent yielding is due to the occurrence of martensitic transformation. The critical stress for inducing martensite and tensile fracture stress increased with increasing tensile speed. Therefore, it is clear that fatigue and tensile properties of Ti-Ni-Cu shape memory alloys are strongly affected by not only test temperature but also deformation speed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 604: Symposium LL – Materials for Smart Systems III , 1999 , 123
Copyright
Copyright © Materials Research Society 2000

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References

1. Miyazaki, S., Materia, Japan Institute of Metals, 36(1997), 293.Google Scholar
2. Otsuka, K. and Shimizu, K., International Metals Reviews, 31(1986), 93.10.1179/imtr.1986.31.1.93Google Scholar
3. Kishi, Y, Yajima, Z., Shimizu, K. and Asai, M., Proc. of PTM'99, (1999), in press.Google Scholar
4. Melton, K. N. and Mercier, O., Acta Metallurgica, 27(1979), 137.10.1016/0001-6160(79)90065-8Google Scholar
5. Honma, T., Shape Memory Alloys, edited by Funakubo, H., Sangyo-tosho, Tokyo, Japan, (1985).Google Scholar
6. ICDD card No. 44–0114Google Scholar
7. ICDD card No. 27–0344Google Scholar
8. Shugo, Y., Hasegawa, H. and Honma, T., Bull. Res. Inst. Mineral Dress. Metall., Tohoku Univ., 37(1981), 79.Google Scholar
9. Nam, T. H., Saburi, T. and Shimizu, K., Materials Transactions, Japan Institute of Metals, 31(1990), 959.Google Scholar
10. Saburi, T., Takagi, T., Nenno, S. and Koshino, K., Proc. of the MRS International Meeting on Advanced Materials, 9(1989), 147.Google Scholar
11. Tada, H., Paris, P. and Irwin, G., The Stress Analysis of Cracks Handbook (Del Research Corporation, USA).Google Scholar
12. Annual Book of ASTM Standards, E647-91, (1991).Google Scholar