研究石墨烯微片(GNPs)的添加对AZ31镁合金纳米颗粒增强活性钨极氩弧焊(NSA-TIG)焊接接头显微组织及力学性能的影响.结果表明,与活性化焊接(A-TIG)相比,NSA-TIG接头熔合区的 α-Mg晶粒明显细化,且活性剂为TiO2+GNPs的接头融合区的 α-Mg粒径最小.此外,与涂覆TiO2+SiCp活性剂的接头相比,涂覆TiO2+GNPs活性剂接头的熔深并没有明显的变化,但其力学性能(显微硬度和极限拉伸强度)都明显提高.且涂覆GNPs后接头在拉伸时出现了颈缩现象.%The effects of graphene nanoplates (GNPs) on the microstructures and mechanical properties of nanoparticles strengthening activating tungsten inert gas arc welding (NSA-TIG) welded AZ31 magnesium alloy joints were investigated. It was found that compared with those of activating TIG (A-TIG), and obvious refinement ofα-Mg grains was achieved and the finestα-Mg grains of fusion zone of NSA-TIG joints were obtained in the welded joints with TiO2+GNPs flux coating. In addition, the penetrations of joints coated by TiO2+GNPs flux were similar to those coated by the TiO2+SiCp flux. However, the welded joints with TiO2+GNPs flux coating showed better mechanical properties (i.e., ultimate tensile strength and microhardness) than those with TiO2+SiCp flux coating. Moreover, the generation of necking only occurred in the welded joints with TiO2+GNPs flux.
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