摘要
对含Ti 50.8%的NiTi形状记忆合金在300℃、400℃、500℃保温不同时间进行时效处理,然后通过差示扫描量热仪DSC对其相变温度点进行测定,发现经时效处理调节后,Af最大可下降20～30℃左右,而Ms变化不大.通过不同时效温度和保温时间的DSC曲线比较,得出热处理对其相变温度点的影响规律,即在300～500℃时效处理时,保温时间越短,Af降低越明显,在相同保温时间时,保温温度越低,Af降低越明显.
50.8 % Ti-Ni shape memory alloys are heat treated at different temperatures for different times and the temperature of transformation is measured with DSC. The Af of NiTi shape memory alloys decreased around 20℃ to 30℃ and the Ms of the alloys changed little through heat treatment. The influence of heat treatment on the phase transformation of NiTi shape memory alloys is discussed by comparing the DSC curves. It is indicated that when aged at 300℃ - 500℃, the shorter the holding time, the lower the Af,in the same time,the lower holding temperature leads lower Af.
出处
《材料开发与应用》
CAS
2007年第2期5-7,共3页
Development and Application of Materials
关键词
NITI形状记忆合金
热处理
相变温度
NiTi shape memory alloy
Heat treatment
Transformation temperature
