摘要
用示差扫描量热仪(DSC)和部分热循环分析法研究了350—800℃退火态和300—500℃时效态Ti-(50．2—50．8)Ni(原子分数,%)形状记忆合金多阶段可逆相变的类型及其演化过程．结果表明,这些合金发生R和马氏体两种可逆相变,相变可以一阶段完成,也可以多阶段完成．时效态合金的相变比退火态复杂,时效温度越低相变越复杂．若用DSC曲线上冷却相变峰数/加热相变峰数表示相变类型,则退火态和时效态合金冷却/加热时可以发生1/1,2/1,2/2,3/2和3/3等类型的相变．给出了各类相变发生的热处理工艺．多阶段可逆相变是一个渐变过程,在冷却相变峰的温度区间进行部分热循环时,随冷却停止(加热开始)温度降低,逆相变峰温度降低．
The multi-stage reversible transformation types and their evolving processes of 350-- 800℃ annealed and 300--500 ℃ aged Ti-（50.2--50.8）Ni （atomic fraction, %） shape memory alloys were investigated by the partial thermal cycling method in differential scanning calorimetry （DSC）. The results show that two kinds of the reversible transformations, R and martensite, occured in these alloys, and each transformation can complete in one-stage, and also in multi-stage. The transformation of aged alloy is more complicated than that of annealed alloy. The lower the aging temperature, the more complicated the transformation. If the transformation type is expressed with the ratios of peak numbers of cooling and heating transformations on DSC curves, the 1/1, 2/1, 2/2, 3/2 and 3/3- type transformations occured upon cooling and heating in the annealed and aged alloys, and the heat treatment processes for each transformation type to take place were given out. The multi-stage reversible transformation is a gradually changing process. When partial thermal cycling was carried out within the temperature range of cooling transformation peak, the transformation temperature of reverse transformation peak decreases with decreasing the cooling stop temperature or heating start temperature.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期353-357,共5页
Acta Metallurgica Sinica
基金
陕西省自然科学基金项目2005E121
陕西理工学院科研基金项目SLGQD0403资助
