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对 Cu-25.83 Zn-3.96Al(wt-%)形状记忆合金在分级淬火时发生的 B_2→DO_3,有序转变过程进行了初步的动力学和热力学分析。结果表明在一定温度下,有序度 S 随分级等温时间的增加几乎呈线性地上升,满足 S=101T·exp(—Q/RT)·t(?)关系,Q 为 DO_3有序过程的激活能,约为12.6kcal/mol(53kJ/mol)。形状回复温度 T(?)则随等温时间增加而降低,并与 S 有以下关系:T:=A+BS~2/1+CS~2,由实验数据回归,可得 T(?)(K)=348(1+106S~2/1+122.8S~2
Preliminary kinetic and thermodynamic analysis of the B_2 → DO_3, ordered transformation process of Cu-25.83 Zn-3.96Al (wt-%) shape memory alloy during quenching was carried out. The results show that at a certain temperature, the ordering degree S increases almost linearly with the increase of the classification isothermal time, which satisfies the relationship of S = 101T · exp (-Q / RT) · t Can, about 12.6 kcal / mol (53kJ / mol). The shape recovery temperature T (?) Decreases with increasing isothermal time and has the following relation with S: T = A + BS ~ 2/1 + CS ~ 2. ) = 348 (1 + 106S ~ 2/1 + 122.8S ~ 2