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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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汽车板用Al—0.6Mg—0.9Si—0.2Cu合金时效析出动力学研究
DOI: 10.3724/SP.J.1037.2013.00330, PP. 1604-1610
Keywords: Al-Mg-Si-Cu合金,汽车板,自然时效,预时效,动力学
Abstract:
采用差示扫描量热法(DSC)和硬度测量方法对汽车用Al—0.6Mg—0.9Si—0.2Cu(质量分数,%)合金不同状态析出动力学进行了研究.结果表明,T4态合金升温到100—-150℃时,DSC曲线出现低温析出峰,而T4P态合金无此低温析出峰;经过T4P处理的合金其β″相析出峰位向低温移动.利用A—J—M方法计算合金不同相析出动力学参数,结果表明,T4和T4P态合金GP区溶解激活能分别为66和119kJ/mol,β″相析出激活能分别为114和60kJ/mol;T4态合金的溶解和析出动力学方程分别为YGP=1-exp[-1.3×107texp(-7977/T)],Yβ″=1-exp[-4.7×1022t2exp(-27484/T)];T4P态合金的溶解和析出动力学方程分别为YGP=1-exp[-2.4×1013texp(-14345/T)],Yβ″=1-exp[-2.9×1011t2exp(-14392/T)].此外,在185℃时效过程中,随着时效时间的延长,T4和T4P态合金的硬度均先不断增加达到峰值后趋于平缓,但是T4态合金经20min时效处理后出现硬度下降,而T4P态合金无此现象,利用GP区回溶和β″相析出动力学对此变化规律进行了很好的解释.
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