Temperature Memory Effect of  Partial Transformation in TiNi Alloys

Acta Metall Sin

2004, Vol. 40

Issue (9): 915-919 DOI:

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Temperature Memory Effect of Partial Transformation in TiNi Alloys

ZHENG Yanjun; CUI Lishan

Department of Materials Science and Engineering; University of Petroleum; Beijing 102249

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ZHENG Yanjun; CUI Lishan. Temperature Memory Effect of Partial Transformation in TiNi Alloys. Acta Metall Sin, 2004, 40(9): 915-919 .

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Abstract Temperature memory effect of a prestrained TiNi alloy under constraint condition was studied by differential scanning calorimetry (DSC). Results showed that the transformation temperature range of the TiNi alloy can be significantly enlarged upon prestraining and constrained heating, which makes the temperature memory effect operational also in an enlarged temperature window. Furthermore, the temperature memory effect of the prestrained and constrained TiNi alloy is more accurate than that of a TiNi alloy in free conditions. The dislocations at the interface between the parent phase and the remaining martensite, and the self--accommodating process near the interface are thought to be the mechanism for the temperature memory effect.

Key words: TiNi alloy shape memory alloy incomplete transformation

Received: 31 July 2003

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