Microscopic study of Suzuki effect on high temperature deformation behaviors of Mg-RE alloys

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K05075
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Akita University
• Principal Investigator: Saito Kaichi 秋田大学, 理工学研究科, 教授 (10302259)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: Mg-Y-Zn合金 / 過飽和固溶体 / 高温変形 / Suzuki効果 / TEM/STEM / EBSD

Outline of Final Research Achievements

High-temperature plastic deformation behavior and the resulting microstructures of magnesium (Mg)-based supersaturated solid-solution alloys containing zinc (Zn) and/or yttrium (Y) have been thoroughly examined in a comparative study by means of various electron microscopy combined with microanalytical techniques. Mg-Y-Zn ternary solid-solution alloys yield remarkably higher levels of flow stresses capable of withstanding high temperatures than binary counterparts. This study demonstrates that the Suzuki effect is measurably activated in Mg-based solid-solution alloys, especially when those containing an adequate amount of combined solutes of Y and Zn, e.g. 0.6~1at%Y and 0.3~0.5at%Zn, are plastically-deformed at a temperature of 300 degrees and at a strain rate of 1.0 × 10-3 s-1.

Free Research Field

材料物理学

Academic Significance and Societal Importance of the Research Achievements

Mgは軽量性や比強度，資源上にメリットをもつにとどまらず，リサイクル性や生体安全性に優れる点も含め，持続可能社会推進に適う戦略的金属といえる。特に自動車部品へのMg合金の採用は，その膨大な市場規模や市場安定性からみて，今後のMg需要の拡大を牽引する最大の産業分野である。本研究が追究する成果は，鋳造用Mg合金を対象に耐熱性という高付加価値を生み出し，マルチマテリアル化の進展をはじめ，マグネシウム材料の用途拡大に貢献する可能性を秘めている。