采用示差扫描量热法(DSC),研究2E12铝合金在190 ℃时效过程中施加强电场(±9 kV/cm)对合金析出的动力学的影响,并探讨电场影响合金时效过程的微观机理.结果表明:时效时施加强电场促进了合金中Ⅰ型S相向Ⅱ型S相的转变,使得析出峰提前;未施加电场的合金样品具有更高的过饱和度、析出焓、析出相体积分数及析出速率;强电场作用降低合金中空位与溶质原子之间的结合能,进而降低S相析出激活能.根据DSC结果对S相析出激活能进行Kissinger方法和普适积分法计算发现,时效过程中施加电场与未施加电场相比,S相激活能分别降低7.9～12.7 kJ/mol和6.8～22.6 kJ/mol.
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