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中文摘要：
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，观察其应力一时间关系曲线．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．
英文摘要：
The solute concentration and precipitated phase content in Al-Cu alloy were altered by solution treatment at different temperatures. A series of serrated stress-time curves was obtained in tensile tests at a constant strain rate. The influences of solute concentration and precipitated phase content on dislocation movement were analyzed with tensile test results, and the micro-mechanism of Portevin-Le Chatelier （PLC） effect was discussed. When solution treatment temperature is reduced from 500 ℃, the amplitude of serrated flow decreases, and reaches the minimum when solution treatment temperature is reduced to 300 ℃. On the contrary, the amplitude of serrated flow increases with solution treatment temperature decreasing continuously from 300 to 100 ℃. Experimental results show that, when solution treatment temperature is higher than 300 ℃, solute concentration is a governing factor to PLC effect, whereas when solution treatment temperature is lower than 300 ℃, the precipitated phase content affects dominantly PLC effect.
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