Ti_(50)Ni_(40)Cu_(10)合金的相变潜热及相变热滞  

Transformation Latent Heats and Hysteresis of Ti_(50)Ni_(40)Cu_(10) Shape Memory Alloy

作　　者：骆苏华[1] 李亚东[2] 

机构地区：[1]苏州大学物理系,江苏苏州215006 [2]苏州大学材料工程学院,江苏苏州215006

出　　处：《材料科学与工程》2003年第1期83-86,共4页Materials Science and Engineering

摘　　要：本文采用示差扫描量热仪 (DSC)系统分析了Ti50 Ni40 Cu1 0 (at.%)合金的马氏体相变潜热 (ΔHB2→B1 9)和逆马氏体相变潜热 (ΔHB1 9→B2 )、相变热滞 (ΔT)与固溶温度、退火温度和相变热循环间的关系。结果表明 :相变潜热随着固溶化温度的升高而明显降低、随着退火温度的升高则略微降低。相变热滞、逆马氏体相变温度在热循环初期迅速降低 ,当热循环次数超过 2次时则均保持不变 ;逆马氏体相变潜热 (ΔHB1 9→B2 和ΔHB1 9′→B1 9)随着热循环次数 (n <4)的增加有所升高 ,特别是ΔHB1 9′→B1 9约增加 5 8%,而热循环次数对马氏体相变温度和潜热ΔHB2→B1 9则无明显影响。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(n<4),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.

关 键 词：Ti50Ni40Cu10合金 相变潜热 相变热滞 热处理工艺 相变热循环 钛镍铜合金 形状记忆合金 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TG156.9[金属学及工艺—合金]