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制备Ti50 Ni4 0 Cu1 0 合金 ,并采用示差扫描量热仪 (DSC)系统分析Ti50 Ni4 0 Cu1 0 合金在不同热处理条件下 ,马氏体相变规律与相变热循环间的关系。结果表明 ,马氏体相变潜热ΔHB2→B1 9和逆马氏体相变潜热ΔHB1 9→B2 随固溶温度的升高而明显降低 ,随退火温度的升高略微降低。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)随热循环次数 (n <4)的增加有所升高 ,特别是ΔHB1 9’→B1 9增加约 48%。而热循环次数对马氏体相变温度和潜热ΔHB2→B1 9的影响则不明显
The Ti50Ni4 0 Cu1 0 alloy was prepared and the relationship between martensite transformation and phase transformation thermal cycle of Ti50 Ni4 0 Cu1 0 alloy under different heat treatment conditions was analyzed by differential scanning calorimetry (DSC). The results show that the latent heat of martensite ΔHB2 → B1 9 and the latent heat of reverse martensite ΔHB1 9 → B2 decrease obviously with the increase of solution temperature, and decrease slightly with the increase of annealing temperature. Phase transition hysteresis, inverse martensitic transformation temperature decreased rapidly in the early thermal cycles, when the number of thermal cycles more than 2 times are unchanged. The reverse martensitic transformation latent heat (ΔHB1 9 → B2 and ΔHB1 9 ’→ B1 9) increased with the number of thermal cycles (n <4), especially about 48% of ΔHB1 9’ → B1 9. The number of thermal cycles on martensitic transformation temperature and latent heat ΔHB2 → B1 9 is not obvious