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本文用直流电阻法研究了分级淬火对Cu-14.84wt％ Zn-7.75wt％Al形状记忆合金热弹性马氏体转变的影响。实验结果表明:中间停留温度T_s低于M_f或高于T_(DO3,s)的分级淬火,将使热弹性马氏体稳定化;T_s位于M_f至M_s或T_(DO3,f)至T_(DO3,s)之间的分级淬火,将使部分热弹性马氏体稳定化;但T_f位于M_s至T_(DO3,f)之间的分级淬火,则可使热弹性马氏体完全避免稳定化。认为热弹性马氏体的稳定化,主要与B_2→DO_3有序转变被淬火抑制,致使随后冷却时刚形成的马氏体不稳定而再有序化有关。
In this paper, DC resistance method was used to study the effect of fractional hardening on the thermoelastic martensitic transformation of Cu-14.84wt% Zn-7.75wt% Al shape memory alloy. The experimental results show that the stepwise quenching of the intermediate residence temperature T_s below M_f or higher than T_ (DO3, s) will stabilize the thermoelastic martensite; T_s is located between M_f to M_s or T_ (DO3, f) to T_ (DO3 , s), will make part of the thermoelastic martensite stabilization; but T_f in M_s to T_ (DO3, f) between the grade quenching, you can completely avoid the thermal elastic martensite stabilization. It is considered that the stabilization of thermoelastic martensite is mainly quenched and quenched with the order transition of B 2 → DO 3, which leads to the instability and subsequent ordering of the newly formed martensite.