HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY

Acta Metall Sin

1992, Vol. 28

Issue (1): 6-10 DOI:

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HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY

QIN Guiying;YU Xuejie;JIN Heng;WANG Jingcheng Shanghai Iron and Steel Research Institute

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QIN Guiying;YU Xuejie;JIN Heng;WANG Jingcheng Shanghai Iron and Steel Research Institute. HYSTERESIS OF PHASE TRANSFORMATION TEMPERATURE IN NiTi SHAPE MEMORY ALLOY. Acta Metall Sin, 1992, 28(1): 6-10.

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Abstract The relationship between structure and hysteresis of phase transformation tem-perature in NiTi shape memory alloy has been investigated by means of TEM observation, positron annihilation and electrical resistivity measurement. The sequence of hysteresis for the alloy aged under different regimes was found to be: plate martensite > R phase > tie--like martensite. The reversible displacement of phase boundaries of these transformations is blocked by the coherent stress field around Ti_(11)Ni_(14) phase particles. A linear relationship between Sparameter of positron annihilation and maximum values of temperature hysteresis showed that the mismatch dislocation and elastic stress field established by Ti_(11)Ni_(14) phase precipitation arethe main factor to determine the temperature hysteresis of phase transformation in NiTi shape memory alloy.

Key words: shape memory alloy hysteresis of phase transformation temperature coherent stress field mismatch dislocation

Received: 18 January 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I1/6

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