Multi-stage reversible transformation types and their evolving processes of Ti-Ni base shape memory alloys

Acta Metall Sin

2007, Vol. 43

Issue (4): 353-357 DOI:

Research Articles

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Multi-stage reversible transformation types and their evolving processes of Ti-Ni base shape memory alloys

Zhi-rong HE

陕西理工学院材料科学与工程学院

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Zhi-rong HE. Multi-stage reversible transformation types and their evolving processes of Ti-Ni base shape memory alloys. Acta Metall Sin, 2007, 43(4): 353-357 .

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Abstract The multi-stage reversible transformation types and their evolving processes of Ti-Ni base shape memory alloys (SMAs) under various heat treatment processes have been investigated by differential scanning calorimetry (DSC) with partial thermal cycling method. The Ti-Ni base SMAs show many kinds of multi-stage reversible transformation types after various heat treatment processes. If expresses transformation type with peak numbers of cooling transformation / peak numbers of heating transformation on DSC curves, the 2/1, 2/2 and 3/2 type transformations occur upon cooling and heating in 350-550℃ annealed alloys; the 1/1 type transformation occurs when the annealed temperature is high than 600℃; the 3/2 and 3/3 type transformations occur in 300℃ aged alloys; the 2/2 type transformation occurs in 400℃ aged alloys; the 2/1 type transformation occurs in 500℃ aged alloys. The multi-stage reversible transformation is a gradually changing process. When partial thermal cycling was carried out within the temperature range of cooling transformation, the transformation temperature of reverse transformation decreases with decreasing thermal cycling start temperature.

Key words: Ti-Ni alloy shape memory alloy superelasticity alloy transformation

Received: 01 August 2006

ZTFLH:

TG113.25

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2007/V43/I4/353

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