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采用中间添加铝粉的电场辅助扩散技术成功连接AZ31B镁合金。通过OM、SEM、XRD以及剪切实验等方法对比分析焊态和焊后自然时效处理状态下接头焊缝区的显微组织、元素分布、相组成和力学性能,探讨自然时效对镁合金电场辅助扩散焊接头组织和性能的影响规律。结果表明:在焊缝区形成一层与母材基体呈波浪状结合界面的镁-铝共晶反应层,反应产物主要由α-Mg、Al12Mg17和Al3Mg2金属间化合物组成;焊缝区显微硬度明显高于母材;经自然时效处理后接头的抗剪强度最大达60.3 MPa,比焊态下接头的最大抗剪强度(35 MPa)提高约72.3%。
AZ31B magnesium alloy was successfully connected by electric field assisted diffusion technology with aluminum powder added in the middle. The microstructure, elemental distribution, phase composition and mechanical properties of weld zone under natural and post-weld natural aging conditions were analyzed by means of OM, SEM, XRD and shear tests. The effects of natural aging on the electric field of magnesium alloy The influence law of the structure and property of diffusion welding joint. The results show that a layer of magnesium-aluminum eutectic reaction layer is formed in the weld zone with a wave-like interface with the base metal matrix. The reaction product mainly consists of α-Mg, Al12Mg17 and Al3Mg2 intermetallic compounds. The microhardness Which is obviously higher than that of the base metal. The shearing strength of the joint after natural aging is up to 60.3 MPa, which is about 72.3% higher than the maximum shear strength (35 MPa) of the welded joints.