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通过改变淬火介质及其温度研究了冷速特性对Cu-Zn-Al形状记忆合金马氏体稳定化的影响。结果表明:不同温度区间的冷速起着不同的作用,高温段冷速通过对淬火空位的数目以及α相的析出的影响而低温段(B2到DO_3转变段)冷速通过对母相有序度变化的影响分别起作用。基于此,文中提出了预防记忆合金马氏体稳定化的新措施——寻求合适的介质,其高温段冷速应低到不引起α相析出,而低温段冷速则应尽可能低以使B2到DO_3转变能充分进行。
The effect of cooling rate on the martensite stabilization of Cu-Zn-Al shape memory alloy was studied by changing the quenching medium and its temperature. The results show that the cooling rates in different temperature ranges play different roles. The cooling rate in high temperature range is determined by the number of quenching vacancies and the precipitation of α phase. The cooling rate in low temperature (B2 to DO_3 transition) The effects of the degree of change work separately. Based on this, a new measure to prevent the martensitic stabilization of memory alloy is proposed in this paper - to find a suitable medium, the cooling rate in the high temperature range should be as low as not causing the α phase precipitation, while the cooling rate in the low temperature range should be as low as possible B2 to DO_3 transition can be fully carried out.