在不同温度下对Al-Cu合金试件进行固溶处理, 以改变溶质原子在固溶体中的浓度及析出相在合金中的含量. 对所得到的Al-Cu合金试件进行常应变率拉伸实验, 观察其应力-时间关系曲线. 由拉伸实验现象分析溶质原子及析出相对位错运动的影响, 从而探究Portevin-Le Chatelier(PLC)效应产生的微观机制. 结果表明, 当固溶处理温度由500℃逐步降低, 应力-时间曲线上的锯齿幅值逐渐减小, 并在300℃时达到最小值; 继续降低固溶处理温度至100℃, 锯齿幅值又逐渐增大. 固溶处理温度高于300℃时, 溶质原子对PLC效应的影响强于析出相的影响而起主要作用; 反之, 固溶处理温度低于300℃时, 析出相对PLC效应的影响强于溶质原子的影响而起主要作用.
In this paper the solute concentration in solid solution and precipitated phase content in alloy are altered by solution treatment at different temperature. The influence on dislocation movement is analyzed by test result, and the micro-mechanism of dynamic strain aging (DSA) is discussed. In the test, when solution treatment temperature reduces stepwise from 500℃, the amplitude of the serrated flow decreases until it reaches minimum at 300℃. And the amplitude increases on the contrary when solution treatment temperature reducing unceasingly to 100℃. When solution treatment temperature is higher than 300℃, solute concentration is the key factor of DSA and its increasing leads to the enhancing of DSA. When solution treatment temperature is lower than 300℃, the intensity of DSA is determined by precipitated phase density and enhances with it increasing.
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