2021 Fiscal Year Annual Research Report
Development of precipitation-hardenable magnesium sheet alloys with strong and rapid age-hardening response
| Project/Area Number |
20K15067
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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, 研究員 (30848320)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Magnesium alloys / Age-hardening response / Precipitate / Atomic radius / Mixing enthalpy |
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| Outline of Annual Research Achievements |
In this year, age-hardening response of Mg-Li-Al and Mg-In-Gd alloys has been evaluated. The Mg-Al-Li alloys are a combination of undersized elements (Al=1.43 angstrom and Li=1.52 angstrom), while Mg-In-Gd alloys are a combination of oversized elements (In=1.63 angstrom and Gd=1.80 angstrom). A newly developed Mg-8Li-5Al (wt.%) alloy has a high hardness value of 90.2 HV in a T4-treated condition, and shows a peak hardness value of 98.5 HV after artificial aging at 50 oC for only 2 h. A Mg-4.4In-6Gd (wt.%) alloy shows a rather low hardness value of 46.9 HV in a T4-treated condition, but has rapid age-hardening response. To be specific, this alloy could reach a peak hardness value of 51.9 HV after artificial aging at 170 oC for only 2 h.
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