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Portevin-Le Chatelier(PLC)效应作为广泛存在于各种合金材料中的重要塑性失稳现象一直受到研究者的广泛关注。本文对镁原子质量百分含量分别为2.5%和5%的两种铝合金-国标LF2和LF5铝合金进行宏观拉伸实验和透射电子显微镜观察实验。通过宏观和微观实验结果的对比分析表明,由于LF5合金中作为溶质的Mg原子的含量相对于LF2合金成倍增加导致析出相颗粒数量也成倍增加,进而引起PLC效应在强度和加工硬化时间的倍增,这些对应关系表明Al-Mg合金中析出相颗粒是产生并影响PLC效应的重要因素。实验结果显示虽然析出相颗粒数量在多方面影响PLC效应,但是对其飞行时间的影响却微乎其微。
The Portevin-Le Chatelier (PLC) effect, as an important plastic instability widely found in various alloy materials, has drawn the attention of researchers. In this paper, macroscopic tensile tests and transmission electron microscopy observations of two kinds of aluminum alloy, GB2 LF5 and LF5, with 2.5% and 5% magnesium atomic percent respectively were carried out. Through the macroscopic and microscopic experimental results of the comparative analysis shows that, due to LF5 alloy as a solute Mg atom content relative to the LF2 alloy doubled lead to the number of precipitated particles also increased exponentially, and then cause the PLC effect in the strength and work hardening time Multiplied. These corresponding relationships indicate that precipitation of phase particles in Al-Mg alloy is an important factor that produces and affects PLC effect. The experimental results show that although the number of precipitated phase particles affects the PLC effect in many ways, the impact on the flight time is negligible.