用提拉法生长的Ni50.3Mn24.5Ga25.2单晶样品,在真空中进行多种形式的热处理.通过测量交流磁化率曲线,研究了退火和淬火对Ni50.3Mn24.5Ga25.2单晶预马氏体和马氏体相变温度的影响.实验表明退火会明显降低预马氏体相变的温度,而对马氏体相变影响较小.还发现在1023K以下,预马氏体相变会随淬火温度的升高而逐步变得明显,而在1023K以上,则呈相反的趋势.另外,实验还表明,经过高温淬火后的样品,再次通过一定的退火处理,样品将恢复明显的预马氏体相变征候.分析表明,热处理是通过改变晶体的内应力来影响预马氏体相变征候的.
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