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用添加微量Cr、Ce的方法制备了Al-0.6Mg-0.9Si-0.1Cr-0.2Ce合金,对该合金的固溶时效热处理工艺进行了研究,分析了预时效对时效硬化效果的影响。结果表明,Al-Mg-Si-Cr-Ce合金适宜的固溶处理制度为540℃保温1 h;预时效可有效缩短Al-Mg-SiCr-Ce合金自然时效时间,且可提高合金人工时效及模拟烘烤后的硬度。经自然时效+模拟烘烤及预时效+自然时效+模拟烘烤后,合金硬度分别达54.0、57.0 HRB,是人工时效处理硬度的97.1%、96.9%,模拟烘烤可代替人工时效。
Al-0.6Mg-0.9Si-0.1Cr-0.2Ce alloy was prepared by adding a small amount of Cr and Ce. The heat-treatment and aging treatment of the alloy were studied. The effect of pre-aging on the aging hardening effect was analyzed. The results show that the proper solution treatment of Al-Mg-Si-Cr-Ce alloy is 540 ℃ for 1 h. Pre-aging can effectively shorten the natural aging time of Al-Mg-SiCr-Ce alloy, Simulate the hardness after baking. After the natural aging + simulated baking and pre-aging + natural aging + simulated baking, the hardness of the alloy reached 54.0 and 57.0 HRB respectively, which is 97.1% and 96.9% of the artificial aging treatment hardness. Simulated baking can replace artificial aging.