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铝合金等非铁金属常以析出金属间化合物之方式达成强化。但若析出的处理时间过长， 其硬度反而会逐渐降低，此为何种现……

铝合金等非铁金属常以析出金属间化合物之方式达成强化。但若析出的处理时间过长， 其硬度反而会逐渐降低，此为何种现象？ （ ） A. 固溶处理 B. 过时效 C. 热膨胀 D. 欠时效

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