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通过显微硬度测试、常规拉伸性能测试、透射电镜观察等研究了微量Ge(0.21%)在Al-3.5Cu(质量分数,%)合金中的微合金化作用。结果表明:175℃时效时,由于Ge与空位间有很强的相互作用,Ge的添加抑制了GP区的形成,也使随后析出的θ′′和θ′的密度减少,含Ge合金时效响应速率减小,峰值硬度和强度降低。200℃时效时,由于时效温度很高,有利于空位扩散,从而释放了Ge对空位的钉扎,使含Ge合金中总的可动空位数量增多,有利于过饱和固溶体的分解,因此含Ge合金时效响应速率反而有所加快,硬化、强化效果增大。
The microalloying of Ge (0.21%) in Al-3.5Cu (mass fraction,%) alloy was investigated by microhardness test, conventional tensile test and TEM observation. The results show that due to the strong interaction between Ge and the vacancies at 175 ℃, the addition of Ge suppresses the formation of the GP zone and the subsequent decrease of the θ ’’ and θ ’precipitates. The aging response of Ge-containing alloys Reduced rate, reduced peak hardness and reduced strength. 200 ℃ aging, the aging temperature is high, is conducive to the diffusion of vacancies, thus releasing the pinning of Ge for vacancies, the total number of movable vacancies in Ge-containing alloys is increased, which is conducive to the decomposition of supersaturated solid solution, the Ge Instead, the aging response rate of the alloy has been accelerated, hardening, strengthening effect increases.