直流电流对Al-1%Si合金时效过程加速效应的研究  

Study on Acceleration Effect of Direct Current on Aging Process of Al-1%Si Alloy

作　　者：孟庆文 颜家维 祝国珍 沈耀[1] MENG Qingwen;YAN Jiawei;ZHU Guozhen;SHEN Yao(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《热加工工艺》2021年第2期150-154,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51671132)。

摘　　要：通过对比传统炉热时效和直流电流时效对固溶Al-1%Si合金微观组织及力学性能的影响,揭示了直流电流对Al-1%Si合金时效过程的加速效应。结果表明,炉热时效以及直流电流时效处理均可促进第二相颗粒析出,提升Al-1%Si合金的力学性能,抗拉强度峰值均接近125 MPa。但直流电流时效可在更短时间内(3 min)达到强度峰值,其原因是电流具有的焦耳热效应以及非热效应,不仅能大大提升原子扩散速度而且可以提升第二相颗粒的形核率以及长大速率,从而有助于第二相颗粒快速弥散析出。By comparing the effects of thermal aging and DC current aging on the microstructure and mechanical properties of solid solution Al-1%Si alloy, the acceleration effect of DC current on the aging process of Al-1%Si alloy was revealed. The results show that, both hot aging and DC current aging can promote the precipitation of the second phase particles and improve the mechanical properties of Al-1%Si alloy. The peak tensile strength is close to 125 MPa. However,direct current aging can reach the peak intensity in a shorter time(3 min). The reason is that the Joule thermal effect and non-thermal effect of current can not only greatly increase the atomic diffusion rate, but also increase the nucleation rate and growth rate of the second phase particles, which is helpful to the rapid dispersion and precipitation of the second phase particles.

关 键 词：AL-1%SI合金 直流电流 时效处理 加速效应 

分 类 号：TG156.7[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]