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OALib Journal期刊
ISSN: 2333-9721
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预变形对汽车用Al-Mg-Si-Cu合金析出行为的影响
DOI: 10.11900/0412.1961.2014.00348, PP. 289-297
Keywords: Al-Mg-Si-Cu合金,汽车板,预时效,预变形,动力学
Abstract:
采用力学性能测试、DSC及TEM研究了预变形对Al-Mg-Si-Cu合金析出行为的影响.结果表明,在慢速率升温过程中,预时效态合金GP区溶解速率均随预变形量的增加而降低,利用Avrami-Johnson-Mehl方法求得经0,5%和15%预变形后合金的GP区溶解激活能分别为137.1,189.5和141.3kJ/mol;若合金经不同预变形后直接进行185℃,20min烤漆硬化,预变形可有效促进沉淀相析出,提高烤漆硬化增量,最高达160MPa,不过预变形量大于10%时合金烤漆硬化增幅减缓;此外,经预变形处理后烤漆态合金的GP区溶解速率在一定温度下均较低,但高于某一温度后,相应的GP区溶解速率均高于未经预变形处理,最终获得的ln[(dY/dT)φ/f(Y)]-1/T曲线甚至会出现高激活能向低激活能转化现象;不过随预变形量增加,β相析出激活能不断降低,析出速率不断增加.
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