Development of cold rolled magnesium alloy sheets with high room temperature formability through texture control

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04716
• 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: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: HUANG Xinsheng 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 (80415679)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: マグネシウム合金 / 圧延 / 集合組織 / 成形性

Outline of Final Research Achievements

This study systematically investigated the effect of texture on the cold rollability and room temperature formability of magnesium alloys. As a result of applying texture control to AZ31 alloy, a commonly used magnesium alloy, high-temperature rolled sheets with a weak basal texture significantly improved the critical reduction ratio of cold rolling from 14% to 34% compared to conventionally rolled sheets with a strong basal texture. It was confirmed that randomizing the initial texture not only markedly improved the cold rollability, but also significantly enhanced the room temperature formability because of the weak basal texture achieved after annealing. It was found that this is due to the formation of randomly oriented recrystallized grains within shear bands that are more uniformly introduced in large numbers.

Free Research Field

金属材料工学

Academic Significance and Societal Importance of the Research Achievements

マグネシウム合金の冷間圧延性と室温成形性の向上は実用化に向けて非常に重要な課題である。集合組織制御により、鉄鋼材料やアルミ合金と同様に冷間圧延ができ、しかも優れた室温成形性を示すマグネシウム合金冷間圧延材の創製ができれば、マグネシウム合金板材の需用が飛躍的に拡大することが期待される。本研究では、マグネシウム合金の冷間圧延性と室温成形性に及ぼす集合組織の影響を初めて系統的に調査し、初期集合組織をランダム化することにより、汎用マグネシウム合金の冷間圧延性が顕著に改善するだけでなく、焼鈍後に弱い底面集合組織を示すため、室温成形性も大幅に向上することを明らかにした。