冷热循环对Ni─Ti形状记忆合金马氏体相变及形状记忆效应的影响

The Effect of Cool-Thermal Cycling on M Transformation and ShapeMemory Effect for NITI Alloy

通过电阻及回复特性的测定，研究了在冷热循环条件下ＮｉＴｉ形状记忆合金记忆效应的稳定性问题。实验结果表明：对不同的ＮｉＴｉ合金固溶处理后，冷热循环对其形状记忆效应均产生影响。但时该合金在再结晶温度下时效处理或退火，冷热循环对其相变温度几乎均不产生影响。同时对产生以上规律的内在机制进行了初步探讨。

The effect of cool-thermal cycling on the transformation temperature and the shape memory efect was investigaed systematically in NiTi alloys which were subjected to various types of thermo0mechanical treatment.In solution-treated specimens with various Ni Contents,the transformation temperatures were found to change with thermal cycling.However,in aged Ni-richspecimens and those annealed at a temperature lower than the recrystallization temperature after cold working,they were found nearly to be constant even aftercool-thermal cycling,Besides, several general rules governing the effect of coolthermal cycling on the shape memory effect were formulated.Based on the above results,the effect of cool-thermal cycling on the transformation temperature and the shape memory effect was charified,and the comples problems concerning with the shapememory effect will be thrown light on by the conckusion drawr in the paper.