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利用透射电镜(TEM),差示扫描量热仪(DSC)等方法对Al-3.5Cu和Al-3.5Cu-0.5In(质量分数,%)合金中θ′相的生成及粗化行为进行对比研究。在175℃时效时In的添加显著地促进了合金的时效响应,时效峰值硬度提高了约200MPa。TEM观察结果显示富铟(In′)粒子在时效早期均匀析出,为θ′相的析出提供了非均匀形核位置;且在θ′相宽面发现了位于其片状顶角的In′粒子;时效后期含In合金中θ′相粗化速率明显小于无In合金。时效前增加6%预变形后两种合金时效响应及效果差别不大,证实T6状态In主要是通过淬火空位团簇,从而促进θ′相析出。
The formation and the roughening behavior of θ ’phase in Al-3.5Cu and Al-3.5Cu-0.5In (mass fraction,%) alloys were investigated by transmission electron microscopy (TEM) and differential scanning calorimeter (DSC) the study. The addition of In at 175 ℃ significantly promoted the aging response of the alloy, the aging peak hardness increased by about 200MPa. The results of TEM observation show that indium-rich (In ’) particles are uniformly precipitated during the early aging period, providing inhomogeneous nucleation sites for the precipitation of the θ’ phase. The In ’particles at their flaky vertices are found on the θ’ ; The aging rate of θ ’phase in In-containing alloys after aging is obviously smaller than that of In-free alloy. Pre-deformation increased by 6% after pre-deformation of the two alloys aging effect and little difference, confirmed T6 state In mainly by quenching the vacancy clusters, thereby promoting θ ’phase precipitation.