锌铝合金填充金属激光TIG焊AZ31/6061搭接接头的组织与力学性能

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2024-08-01 DOI:10.1016/j.jma.2023.01.009

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引用次数: 0

摘要

设计了一系列 Zn-xAl（x = 0-35 wt.%）合金填充金属，用于通过激光-TIG 混合焊接将 AZ31 Mg 合金与 6061 Al 合金连接在一起。研究了铝含量对填充金属润湿性、微观结构演变和接头强度的影响。结果表明，接头强度随着填充金属中铝含量的增加而提高。当使用 Zn-15Al 填料时，极限断裂载荷达到最大值 1475.3 N/cm，比使用纯 Zn 填料时提高了 28%。这是因为铝元素在填充金属中起到了 "反应抑制剂 "的作用，有助于抑制镁基金属的溶解和镁锌反应。添加适量的铝元素可促进富铝固溶体的沉淀，而不是锌固溶体的沉淀。与锌固溶体相比，MgZn2 IMC 与铝固溶体的晶格失配较低，因此接头强度得到了提高。然而，过量添加铝会形成脆性的 Mg32(Al,Zn)49 三元化合物，导致接头性能下降。

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Microstructure and mechanical performance of AZ31/6061 lap joints welded by laser-TIG hybrid welding with Zn-Al alloy filler metal

A series of Zn-xAl (x = 0‒35 wt.%) alloy filler metals were designed to join AZ31 Mg alloy to 6061 Al alloy by laser-TIG hybrid welding. The effect of Al content on the wettability of filler metals, microstructure evolution and strength of joint was investigated. The results indicated that the strength of joints was improved with the increase of Al content in filler metals. When Zn-15Al filler was used, the ultimate fracture load reached the maximum of 1475.3 N/cm, which was increased by 28% than that with pure Zn filler. The reason is that the Al element acts as a "reaction depressant" in filler metal, which contributes to inhibiting the dissolution of Mg base metal and the Mg-Zn reaction. The addition of appropriate quantity of Al element promoted the precipitation of Al-rich solid solution instead of Zn solid solution. The MgZn₂ IMCs have lower lattice mismatch with Al solid solution than Zn solid solution, thus the strength of joints is improved. However, the excessive addition of Al caused the formation of brittle Mg₃₂(Al,Zn)₄₉ ternary compounds, leading to the deterioration of joint performance.

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.