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<p>The influence of temperature and chemical composition of intermediate layers on the formation of welded joints structure made of AMg2 aluminum and MA2‑1 magnesium alloys is investigated. A&#xa0;diffusion zone with a&#xa0;thickness of approx. 80 μm is formed between magnesium and aluminum alloys with a&#xa0;microhardness of 2160 MPa in the central part, where the cracking occurs during the thermodeformation welding cycle at <i>T</i> = 400 °C. Nickel or titanium foil 30 μm thick was used as a&#xa0;barrier layer to reduce the intensity of diffusion processes at the interface and prevent the formation of brittle intermetallic phases between the alloys. Intermetallic layers are not formed in the magnesium-aluminum joints obtained using a&#xa0;titanium foil layer. Mechanical bending and tensile tests showed that the strongest magnesium-aluminum joints (σ<sub>UTS</sub> = 138–142 MPa) were obtained when using titanium layers.</p>

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Investigation of the microstructure of aluminum and magnesium joints during diffusion welding

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • L. V. Petrushynets,
  • V. Ye. Fedorchuk,
  • L. V. Mikhailov,
  • Iu. V. Falchenko,
  • O. O. Novomlynets,
  • S. O. Voronin

摘要

The influence of temperature and chemical composition of intermediate layers on the formation of welded joints structure made of AMg2 aluminum and MA2‑1 magnesium alloys is investigated. A diffusion zone with a thickness of approx. 80 μm is formed between magnesium and aluminum alloys with a microhardness of 2160 MPa in the central part, where the cracking occurs during the thermodeformation welding cycle at T = 400 °C. Nickel or titanium foil 30 μm thick was used as a barrier layer to reduce the intensity of diffusion processes at the interface and prevent the formation of brittle intermetallic phases between the alloys. Intermetallic layers are not formed in the magnesium-aluminum joints obtained using a titanium foil layer. Mechanical bending and tensile tests showed that the strongest magnesium-aluminum joints (σUTS = 138–142 MPa) were obtained when using titanium layers.