摘要
对Fe-27Mn-6Si-5Cr(%,质量分数)形状记忆合金热拉丝经不同温度退火,观察其显微组织.发现700°C时再结晶刚结束,此时晶粒最细小;低于700°C退火,试样内存在变形晶粒;800°C退火再结晶,呈现晶粒粗大.采用膨胀法和四端电阻法研究退火温度对试样热诱发ε-马氏体Ms的影响.Ms随退火温度的升高而升高,到700°C达到最高,800°C以上Ms复又降低,这可能与700°C退火后变形结构的消除、再结晶晶粒十分细小和层错单一取向形成有关.
It is found from the SEM microstructure analysis under different annealing temperature that the recrystallization temperature of the hot drawing wire of Fe 27Mn 6Si 5Cr shape memory alloy is about 700℃. Deformation grains are existed in the specimens when the annealing temperature is below 700℃; while above 700℃, the grains become coarse. In this study, the thermal dilation method and resistivity method are used to investigate the effect of annealing temperature on the thermal induced ε martensitic transformation point M s. The results show that M s rises with the increasing of the annealing temperature and reaches the highest point at 700℃, then decreases above 700℃. The phenomenon may be due to the elimination of the deformed structure, the small recrystallization grain size and the formation of the stacking faults along a single orientation.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
1998年第2期88-90,共3页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金
关键词
铁基
形状记忆合金
退火
显微组织
相变点
Fe based shape memory alloy
thermal induced ε martensitic transformation point
annealing