Effect of Aging Temperature and Time on Structure and Properties of A356 Aluminum Alloy under Low Intensity Pulse Magnetic Field
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摘要: 对A356铝合金进行T6热处理,在时效时施加33 mT低强度脉冲磁场,研究了时效温度(175,185 ℃)和时效时间(50,60,70 min)对A356铝合金显微组织和力学性能的影响。结果表明:在脉冲磁场作用下时效后,A356铝合金的二次枝晶间距随时效温度升高或时效时间延长而减小,共晶硅的长径比随时效时间延长先减小后增大;时效温度为185 ℃时共晶硅的直径和长径比较175 ℃时有所增大,但其数量减少;在脉冲磁场作用下时效后,A356铝合金的抗拉强度和屈服强度随时效时间延长或时效温度升高而增大;A356铝合金的热处理工艺可改进为540 ℃固溶60 min+175 ℃时效70 min,时效时施加33 mT脉冲磁场,该工艺处理后铝合金的拉伸性能满足使用要求。Abstract: T6 heat treatment was conducted on A356 aluminum alloy, whose aging process was carried out under 33 mT low intensity pulse magnetic field. The effects of aging temperature (175,185 ℃) and aging time (50, 60, 70 min) on the microstructure and mechanical properties of A356 aluminum alloy were studied. The results show that after aging under pulse magnetic field, the secondary dendrite spacing of A356 aluminum alloy decreased with the increase of aging temperature or aging time, and the aspect ratio of eutectic silicon decreased first and then increased with the increase of aging time. The size and aspect ratio of eutectic silicon at 185 ℃ aging temperature were higher than those at 175 ℃, but the quantity decreased. After aging under pulse magnetic field, the tensile strength and yield strength of A356 aluminum alloy increased with the increase of aging time or aging temperature. The improved heat treatment process for A356 aluminum alloy was solid solution at 540 ℃ for 60 min+aging at 175 ℃ for 70 min, and during aging applying 33 mT pulse magnetic field. Treated by this process, the tensile properties of the aluminum alloy met the reguirements.
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