TiNiPd高温形状记忆合金相变温度与相变滞后的研究

 回顾了在 Ti Ni二元系合金基础上发展起来的 Ti Ni-X三元系高温形状记忆合金及 Ni Al系高温形状记忆合金。重点研究了 Ti Ni Pd系合金成分、相变温度和相变滞后的关系。结果表明 :当 Pd的原子百分数大于3 3 %,相变点的增加尤为显著,Pd的原子百分数提高 1 %,将导致合金的相变温度升高 2 0℃,当 Pd的原子百分数为 4 0 %时,Ms点可达 3 79.8℃。温度滞后ΔT随 Pd含量的增加基本不变,只是在 Pd原子百分数达到4 0 %时ΔT略有增加。相变热ΔH随 Pd含量增大呈线性增加,非常明显

PHASE TRANSFORMATION TEMPERATURES AND HYSTERESIS IN TiNiPd HIGH TEMPERATURE SHAPE MEMORY ALLOY

This paper has reviewed NiTi based ternary NiTi X and binary NiAl high temperature shape memory alloys. The emphasis was laid on studying the relation between chemical composition,phase transformation temperatures and transformation hysteresis. It is indicated that the transformation temperatures increased evidently with increasing Pd content, especially when the alloy containing more than 33at% Pd. Every 1at% more Pd content addition led to an effect of about 20℃ increment of transformation temperature. An alloy with 40at% Pd can reach a transformation temperature of 379.8℃. The temperature hysteresis remained nearly constant and the latent heat enlarged linearly with Pd content increment.