This study discusses the effects of the addition of Sc and Zr on the microstructure, and mechanical and corrosion properties of an electron beam welded 5083-H15 alloy. The results show that the addition of Sc and Zr to a 5083 alloy exerted a remarkable effect on grain refinement resulting in an enhancement of the mechanical properties. Moreover, the addition of Sc and Zr prompted precipitation of Al₃ (Sc, Zr) precipitate in the heat-affected zone during the electron beam welding, thereby hindering the movement of dislocations and inhibiting recrystallization, effectively improving the tensile strength, joint efficiency, and hardness of the welded joint. Combined additions of Sc and Zr to a 5083 alloy led to a remarkable enhancement in the resistance to intergranular corrosion at the weld joints as determined via nitric acid mass loss tests for a reduction from 9.72 to 3.61 mg/cm². The main reason for the improvement in corrosion resistance is the addition of Sc and Zr. Recrystallization at the welded joint was inhibited by the formation of the Al₃ (Sc, Zr) phase during the electron beam welding which acted to suppress the formation of the β phase along the grain boundaries in the welded zone.

中文翻译：

---

含Zr和Sc的5083-H15合金的电子束焊接行为

这项研究讨论了Sc和Zr的添加对电子束焊接5083-H15合金的组织，力学性能和腐蚀性能的影响。结果表明，向5083合金中添加Sc和Zr对晶粒细化具有显着影响，从而提高了机械性能。此外，添加Sc和Zr促使Al ₃析出（Sc，Zr）在电子束焊接过程中在热影响区析出，从而阻碍了位错的移动并抑制了再结晶，有效地提高了焊接接头的抗拉强度，接头效率和硬度。将Sc和Zr组合添加到5083合金中，可以显着提高焊接接头的抗晶间腐蚀能力，这是通过硝酸质量损失试验确定的，从9.72降至3.61 mg / cm ²。改善耐腐蚀性的主要原因是添加了Sc和Zr。Al ₃的形成抑制了焊接接头的再结晶 电子束焊接过程中的（Sc，Zr）相起到了抑制沿焊接区晶界形成β相的作用。