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对AZ91镁板进行钨极氩弧焊(TIG)过程中,外加不同频率纵向交流磁场,并在焊后进行固溶时效处理,本文对焊接接头固溶时效处理后的组织性能进行了分析。结果表明,经固溶时效处理后,大量弥散的β-Mg_(17)Al_(12)相从基体α-Mg中析出,其析出数量先随磁场频率增加而增多,之后又减少。从而导致焊接接头的显微硬度、抗拉强度和塑性先增大后减小,而焊接接头的耐电化学腐蚀性先减小后增大。磁场频率为15 Hz时,其接头耐蚀性最差,但接头显微硬度、抗拉强度和塑性最好。
During the TIG process of AZ91 magnesium plate, the longitudinal AC magnetic fields with different frequencies were applied and the solution treatment was performed after aging. The microstructure and properties of the welded joints after solution aging treatment were analyzed in this paper. The results show that a large amount of dispersed β-Mg_ (17) Al_ (12) phase precipitates from matrix α-Mg after solution treatment and aging treatment, and the amount of precipitation increases with increasing magnetic field frequency and then decreases. As a result, the microhardness, tensile strength and plasticity of welded joints first increase and then decrease, while the resistance to chemical corrosion of welded joints first decreases and then increases. When the magnetic field frequency is 15 Hz, the joint corrosion resistance is the worst, but the joint microhardness, tensile strength and plasticity are the best.