系统地研究了Ni49Ti51-xZrx合金冷轧板的相变温度及记忆性能.随着Zr含量的增加,Ni49Ti51-xZk合金铸锭相变温度Af升高,在15％Zr(原子分数)时达到228℃,Mf先降低后升高.Ni49 Ti51-xZL合金板材的硬度随冷轧变形量增加而增加,随退火温度升高而降低.对于Ni49Ti51xZrx合金25％冷轧变形量板材,随退火温度升高,锆的原子分数低于5％时合金板材的Af先降低再升高,Ni49Ti41 Zr10、Ni49Ti36Zr15合金板材Af持续升高.随退火温度升高,冷轧板材记忆恢复应变先升高后降低,在500℃时具有最高值,双程可恢复应变升高;随Zr含量增加,可恢复应变降低,双程记忆恢复应变减小.
Transformation temperature and shape memory property of Ni49Ti51-xZrx cold-rolled plate under different annealing temperature were systematically analyzed.The phase transformation temperature Af of Ni49 Ti51 x Zrx alloys ingot increases with increasing Zr content,reaching 228 ℃ at 15 ％ Zr content(atom fraction).The Mf transformation temperature first increases and then decreases with the increasing of Zr content.The hardness of Ni49 Ti51-x Zrx alloys plate shifts to higher value with lager cold-rolled deformation and decreases gradually with increasing annealing temperature.For 25 ％ cold-rolled reduction plate of Ni49 Ti51-x Zrx alloys,with the increasing of annealing temperature,Af first increases and then decreases for the alloys of Zr content lower than 5％ (atom fraction),while that continuously increases for the Ni49Ti41Zr10 and Ni49Ti36Zr15 alloys,and the recovery strain of Ni49Ti51-x Zrx alloys first increases and then decreases reaching the highest value at 500 ℃.The recovery strain increases and twoway memory recovery strain decreases with the increasing of Zr content.
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