Al-Mg-Si-Zr-XEr合金β″相析出动力学研究

发布时间：2018-03-13 20:37

  本文选题：Al-Mg-Si合金　切入点：β″相　出处：《稀有金属材料与工程》2016年11期 　论文类型：期刊论文

【摘要】：通过组织观察、性能检测和差热分析(DSC)试验,研究了不同Er元素含量下Al-Mg-Si-Zr-XEr合金时效硬化曲线、TEM组织、β″相的析出激活能和TTT曲线,并得到对应的β″相析出动力学方程和TTT表达式。结果表明:Er元素的添加促进了β″相的析出,在540℃固溶1 h+180℃时效5 h时,Al-Mg-Si-Zr-0.3Er合金中的β"相细小均匀的弥散析出;随Er元素含量增加,合金硬化速率明显加快,软化速率降低,合金β″相析出激活能降低,分别为96.3、93.6和84.9 k J/mol;析出动力学方程分别为:Y?(Er0.1)=1 exp[ 1.534×10~(13)t~(1.5)exp( 17382.7/T)]、Y_(Er0.2)=1 exp[ 5.865×10~(12)t_(1.5)exp( 16895.3/T)]、Y_(Er0.3)=1 exp[ 2.965×10~(11)t~(1.5)exp( 15324.9/T)];TTT曲线方程分别为:T_(Er0.1)=17382.7/[30.4+1.5lnt lnln(1-Y)~(-1)]、T_(Er0.2)=16895.3/[29.4+1.5lnt-lnln(1 Y)~(-1)]、T_(Er0.3)=15324.9/[26.4+1.5lnt lnln(1 Y)~(-1)]。
[Abstract]:The activation energy of precipitation and TTT curves of Al-Mg-Si-Zr-XEr alloy aged hardening curve and 尾 "phase under different er content were studied by microstructure observation, performance test and differential thermal analysis (DSCC) test. The corresponding 尾 "phase precipitation kinetics equation and TTT expression were obtained. The results showed that the addition of the element of: er promoted the precipitation of 尾" phase, and the 尾 "phase in Al-Mg-Si-Zr-0.3 er alloy was dispersed homogeneously at 540 鈩，

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