Cu-Zn-Al-Ce形状记忆合金再结晶退火的研究

Research on Recrystallization of Cu-Zn-Al-Ce Shape Memory Alloy

对Cu-Zn-Al-Ce形状记忆合金再结晶退火规律及其驱动力进行了研究。结果表明:该合金的再结晶转变量分别随退火温度的升高、保温时间的延长和冷轧量的增加而增加;再结晶终了时的晶粒尺寸随冷轧量的增加而减少,随退火温度的升高而增大;再结晶转变的驱动力(即微观应力)随冷轧量的增加而增大,根据试样在不同温度下保温1h退火后α和β相的残余微观应力值,得知α相优先进行再结晶转变。

The recrystallization of cold-rolled Cu-Zn-Al-Ce shape memory allloys has been investigated in this paper. It shows that volume fraction of recrystallization increases with the increase of important factors, such as heating temperature, holding time during heating and cold-rolling down ratio: The recrystallized grain size decreases with increase of cold-rolling down ratio, but it incrases with heating temperature. Propulsive forces in the recrystallization which are microscopic stresses in cold-rolled specimens increase with the increase of cold-rolling down ratio. According to the retained microscopic stresses in a and β phases in specimens which are annealed for one hour at different temperatures, it proves that a phase recrystallization is in advance of β phase, this phenomenon is shown by high temperature microscope as well.