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在外加纵向交流磁场作用下,对AZ91镁合金板进行钨极氩弧焊(TIG),并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,固溶时效后,AZ91镁合金焊接接头组织由基体α-Mg和β-Al12Mg17两相组成,大量β-Mg17Al12相弥散析出。随磁场电流增加,焊接接头晶粒先细小后粗大;磁场电流为1.5 A时,晶粒最为细小,大量β-Mg17Al12相在晶界晶内弥散析出,接头显微硬度、抗拉强度和塑性最好,耐蚀性最差。
Under the action of applied AC magnetic field, the TIG of AZ91 magnesium alloy plate was analyzed, and the microstructure and properties of the welded joint after solution aging treatment were analyzed. The results show that, after solution aging, the microstructure of AZ91 magnesium alloy welded joints consists of two phases, α-Mg and β-Al12Mg17, and a large number of β-Mg17Al12 phases are dispersed precipitates. With the increase of the magnetic field current, the grain size of the welded joint is small and coarse first; when the magnetic field current is 1.5 A, the grain is the most fine and a large amount of β-Mg17Al12 phase is dispersed precipitated in the grain boundary; the microhardness, tensile strength and plasticity Well, the worst corrosion resistance.