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制备了CuZn和CuZnCrZr两种合金 ,用Gleeble 1 50 0测定它们在恒温和恒速下的稳态变形抗力 ,绘制成lnσ—ln ε和lnσ— 1 /T关系曲线 ,从而确定合金的变形激活能Q和应力指数n ,并观察了热变形组织。结果表明 :在Cu1 3Zn合金中加入 0 .1 %Zr和 0 .1 %Cr,对合金的动态再结晶有强烈抑制作用 ,合金在 650～ 82 0℃之间热变形为不完全动态再结晶组织 ,而Cu1 3Zn合金在 750～ 82 0℃之间为完全动态再结晶组织。与此相对应 ,CuZn合金热变形激活能在 650～ 70 0℃温度段为 367kJ/mol,在 750～ 82 0℃温度段为 2 52kJ/mol;而CuZnZrCr合金始终保持为 366kJ/mol。
The CuZn and CuZnCrZr alloys were prepared and their steady-state deformation resistance at constant temperature and constant velocity was measured by Gleeble 1 50 0, and the curves of lnσ-ln ε and lnσ-1 / T were plotted to determine the alloy’s deformation activation energy Q and stress index n, and the thermal deformation of the organization was observed. The results show that the addition of 0.1% Zr and 0.1% Cr to Cu1 3Zn alloy strongly inhibits the dynamic recrystallization of the alloy. The alloy is thermally deformed to an incompletely dynamic recrystallization at 650 ~ 82 0 ℃ , While the Cu1 3Zn alloy is fully dynamic recrystallized at 750 ~ 82 0 ℃. Correspondingly, the thermal deformation activation energy of CuZn alloy is 367kJ / mol at 650-70O0C and 525kJ / mol at 750-820C, while the CuZnZrCr alloy is always at 366kJ / mol.