Title: Transformation Latent Heats and Hysteresis of Ti_(50)Ni_(40)Cu_(10) Shape Memory Alloy
Abstract: In this paper, Ti 50Ni 40Cu 10(at.%) alloy was prepared and the transformation latent heats and hysteresis under different heat treatment processes and thermal cycling times were investigated systematically by differential scanning calorimeter(DSC). It was found that the martensitic transformation latent heat(ΔH B2→19) and the reverse martensitic transformation latent heat(ΔH B19→B2) decreased significantly with increasing solution temperatures, and they decreased slightly with increasing annealing temperatures. The transformation hysteresis and reverse martensitic transformation temperatures decreased abruptly during the initial thermal cycling process and then remained constant with further thermal cycling times. The reverse transformation latent heats (ΔH B19→B2 and ΔH B19′→B2) increased with increasing thermal cycling times(n4),especially ΔH B19′→B19 increased about by 58%, while the martensitic transformation temperatures and martensitic transformation latent heat(ΔH B2→B19 remains almost constant whatever the thermal cycling times.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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