High-strength and high-ductility BCC Mg alloys with synergistic effect of TRIP and TWIP

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H01691
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26010:Metallic material properties-related
• Research Institution: Tohoku University
• Principal Investigator: Ando Daisuke 東北大学, 工学研究科, 准教授 (50615820)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: マグネシウム / スカンジウム / 相変態 / マルテンサイト / 超弾性 / TRIP / TWIP

Outline of Final Research Achievements

Binary Mg-Sc alloys and ternary Mg-Sc-X alloys were investigated using prediction of the transition of phase stability and main deformation mechanism at the d-orbital level method. However, we were not able to create a deformation twinning dominant alloy. On the other hand, we have succeeded in creating binary Mg-Sc alloys and ternary Mg-Sc-X alloys that exhibit the TRIP effect due to deformation-induced martensitic transformation. In particular, the alloy with RE (rare earth) element selected as X has the highest strength and ductility balance compared with any of the previously reported Mg-based alloys.

Free Research Field

材料組織学

Academic Significance and Societal Importance of the Research Achievements

マグネシウム合金はその軽量さからモバイル電子機器の筐体に用いられている。本研究では、マグネシウム合金の使用用途を広げるために、その強度・延性バランスを向上させる試みを、過去にマグネシウム基では報告例がない（結晶）相変態を用いて実現することを試みた。この成果により、高強度・高延性なMg合金を創製することができ、この合金は航空宇宙産業や医療用途向けの材料として期待できる。