Intermetallic Compounds Formation in Dissimilar Friction Stir Welding of Mg/Cu Alloys

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-06-13 DOI:10.1007/s40195-024-01714-z
Xue Li, Qingzhen Zhao, Hao Su, Ji Chen, Chuansong Wu
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Abstract

Joining dissimilar Mg/Cu alloys was still an intractable problem because of the excessive intermetallic compounds (IMCs) and poor mechanical properties using conventional welding methods. In the present study, friction stir welding was employed for the butt joining of dissimilar AZ31B Mg-alloy and T2 pure Cu plates. Defect-free Mg/Cu joints were obtained with Mg-RS and Cu-AS configuration, at a welding speed of 50 mm/min and tool rotating speeds of 325 r/min, 625 r/min and 925 r/min. At the joining interface, both Mg2Cu and MgCu2 IMC phases were observed, with a clear, uniform and continuous IMCs layer composed of two sub-layers, layer-A of Mg + Mg2Cu and layer-B of Mg2Cu + MgCu2. The maximum ultimate tensile strength of the Mg/Cu friction stir welding joint reached 130 MPa at 925 r/min due to enhanced mechanical interlocking between Mg and Cu, as well as sufficient metallurgical bonding at the joining interface with an IMCs layer thickness in the range of 1.0–2.0 μm.

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镁/铜合金异种摩擦搅拌焊接中金属间化合物的形成
由于金属间化合物(IMC)过多和机械性能较差,使用传统焊接方法连接异种镁/铜合金仍然是一个棘手的问题。在本研究中,采用了搅拌摩擦焊对异种 AZ31B 镁合金和 T2 纯铜板进行对接。在焊接速度为 50 mm/min,工具旋转速度为 325 r/min、625 r/min 和 925 r/min 的条件下,通过 Mg-RS 和 Cu-AS 配置获得了无缺陷的 Mg/Cu 接头。在连接界面上,可以观察到 Mg2Cu 和 MgCu2 IMC 相,IMC 层清晰、均匀、连续,由两个子层组成,即 Mg + Mg2Cu 层-A 和 Mg2Cu + MgCu2 层-B。Mg/Cu 搅拌摩擦焊接接头在 925 r/min 时的最大极限拉伸强度达到 130 MPa,这是因为 Mg 和 Cu 之间的机械互锁性得到了增强,并且在 IMCs 层厚度为 1.0-2.0 μm 的连接界面上实现了充分的冶金结合。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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