脉冲磁场固溶处理对A356铝合金组织和性能的影响

Effect of pulsed-magnetic field solution treatment on microstructure and properties of A356 aluminum alloy

将A356铝合金在540℃下的固溶处理过程中施加磁感应强度为33 mT的脉冲磁场,研究脉冲磁场对其显微组织和力学性能的影响。采用电子万能试验机进行拉伸试验,并利用OM、SEM观察A356铝合金的显微组织和断口形貌。结果表明,与传统固溶处理工艺相比,经过脉冲磁场固溶处理后的A356铝合金晶粒细化明显,共晶硅的平均尺寸、平均面积和SDAS值减小,数量增多。A356铝合金在脉冲磁场固溶处理时间为40 min时,与传统固溶工艺下的力学性能并无太大差别,强度略有提升。通过与传统固溶处理工艺对比,脉冲磁场固溶工艺可以在细化晶粒的同时大幅度缩短固溶时间。脉冲磁场固溶时间为40 min时,比传统固溶工艺时间缩短了91.11%,大大提高了生产效率。

A pulsed-magnetic field with a magnetic induction intensity of 33 mT was applied to A356 aluminum alloy during solution treatment at 540 C to study the effect of pulsed-magnetic field on the microstructure and mechanical properties.The tensile test was conducted using an electronic universal testing machine,and the microstructure and fracture morphology of the A356 aluminum alloy were observed using OM and SEM.The results show that compared with traditional solution treatment,the grain refinement phenomenon of the A356 aluminum alloy after pulsed-magnetic field solution treatment is obvious,and the average size,average area,and SDAS value of eutectic silicon decrease,while the quantity increases.When the pulsed-magnetic field solution treatment time of the A356 aluminum alloy is 40 min,there is no significant difference in mechanical properties compared to traditional solution treatment,and the strength is slightly improved.Compared with traditional solution treatment,the pulsed-magnetic field solution treatment can significantly shorten the solution treatment time while refining the grains.When the pulsed-magnetic field solution treatment time is 40 min,the process time is reduced by 91.11%compared with the traditional solution treatment,greatly improving production efficiency.