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以汽车车身用6061-T4铝合金为研究对象,利用显微硬度测试、拉伸试验和透射电子显微镜(TEM),研究温变形对汽车车身用6061铝合金自然时效及烤漆硬化的影响.结果表明:温变形后的6061铝合金不会发生明显的自然时效效应,放置8d的自然时效过程中硬度值保持稳定;对温变形样品分别立即和停放8d后,实施模拟烤漆(180℃人工时效30mm)温变形后立即进行烤漆,其硬化能力与放置8d后再进行烤漆样品的无明显差异.合金烤漆后的硬度与温变形温度有关,在160~230℃范围内,随着温变形温度上升,硬度上升;而经250℃拉伸后,烤漆硬度出现下降, 230℃为最适宜温度,此条件下成形后的6061铝合金经烤漆过程后,硬度最高值可达到114HV.

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