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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical Properties, Corrosion Behavior, and Microstructures of a MIG-Welded 7020 Al Alloy
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Mechanical Properties, Corrosion Behavior, and Microstructures of a MIG-Welded 7020 Al Alloy

机译：MIG焊接7020铝合金的力学性能，腐蚀行为和显微组织

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摘要

7020 aluminum alloy plates were welded by metal inert gas welding method, with the ER5183 welding wire containing Zr and ER5356 welding wire without Zr, respectively. The mechanical properties, corrosion behavior, and microstructures of these two welded joints were investigated. The tensile strength and ductilities of the joints are inferior to those of base alloy, and the lowest hardness is obtained in the welded zone, while the heat-affected zones are more sensitive to corrosion than the base metal and welded zones. The base metal shows a deformed subgrains microstructure, and the heat-affected zones still remain in elongated shape, where the soften zones form as a result of eta' (MgZn2) coarsening. Two welded zones are mainly characterized by as-cast structure; however, grains are refined and a zone of equiaxed grains forms along the bonding boundary due to the Zr addition into ER5183 Al alloy. Accordingly, the mechanical properties and corrosion resistance in this zone of the joint with ER5183 exhibit better than those of the joint with ER5356.
机译：用金属惰性气体保护焊方法焊接7020铝合金板，分别使用含Zr的ER5183焊丝和不含Zr的ER5356焊丝。研究了这两个焊接接头的机械性能，腐蚀行为和微观结构。接头的抗拉强度和延展性低于母材，在焊接区获得的硬度最低，而热影响区比母材和焊接区对腐蚀更敏感。贱金属显示出变形的亚晶粒微观结构，热影响区仍保持细长形状，其中软化区由于eta'（MgZn2）粗化而形成。两个焊接区的主要特征是铸态结构。但是，由于在ER5183铝合金中添加了Zr，晶粒细化并且沿键合边界形成等轴晶粒区。因此，与ER5183的接头在该区域的机械性能和耐腐蚀性优于与ER5356的接头。

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