2023 Fiscal Year Research-status Report
Improving joint strength of lightweight magnesium and aluminum clad sheets by forming a Mg-Al-containing high/medium entropy interlayer
| Project/Area Number |
23K04455
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
Bian Mingzhe 国立研究開発法人産業技術総合研究所, 材料・化学領域, 主任研究員 (30848320)
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| Project Period (FY) |
2023-04-01 – 2026-03-31
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| Keywords | Magnesium / Aluminum / High entropy interlayer / Ultrasonic welding / Interface |
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| Outline of Annual Research Achievements |
The objective of this research is to enhance the joint strength of ultrasonically welded Mg/Al joint sheets by forming a ductile Mg-Al-containing high/medium entropy interlayer. In the first year, an attempt was made to evaporate a model high entropy alloy, namely Cantor Co-Cr-Fe-Ni-Mn alloy, onto AZ31 (Mg-3Al-1Zn-0.3Mn in wt%) and A5052 (Al-2.6Mg-0.1Si-0.2Cr-0.3Fe in wt%) alloy sheets under vacuum conditions. However, due to the large differences in the evaporation temperatures of each element, the thermal evaporation approach proved to be difficult. Therefore, a melt spinning method was employed to produce a Cantor alloy foil with a thickness of 20 um. Subsequently, Mg/Cantor/Al joints were successfully produced under various welding conditions.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The thermal evaporation process proved difficult due to the significant differences in the evaporation temperatures of Co, Cr, Fe, Ni, and Mn. Additionally, it appears that Ni and Co reacted with tungsten (W), leading to the breakage of the W basket during the heating process. Fortunately, the applicant found an alternative method, i.e. melt spinning method to produce a Cantor alloy foil.
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| Strategy for Future Research Activity |
Attempts will be made to evaporate single elements such as Zn, Cu, Ag, Ni, Ti, and Zr onto AZ31 and/or A5052 alloy sheets under vacuum conditions. If the thermal evaporation approach proves ineffective, foils will be purchased, and Mg/third element foil/Al joints will be produced under different ultrasonic welding conditions. Tensile shear tests and microstructure characterization work using metallography will commence shortly after the joint sheets are produced.
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