Development of Widmanstatten type heat resistant Magnesium alloys with over 400 MPa for automobile engine cylinder

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K21912
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Ando Daisuke 東北大学, 工学研究科, 准教授 (50615820)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Keywords: マグネシウム / スカンジウム / 相変態 / 耐熱材料 / エンジンシリンダー / ウィッドマンシュテッテン

Outline of Final Research Achievements

In this study, an automotive engine cylinder with improved fuel efficiency comparable to a 1000 kgf reduction in vehicle weight was achieved by creating a 400 MPa-grade Wiedmannstetten-type Mg heat-resistant alloy. At the same time, the mechanism of high-temperature strength improvement by using phase transformation, which is the first attempt in Mg-based alloys, was investigated. As a result, an alloy with good ductility at 300°C and a maximum tensile strength of 430 MPa was created, and by adding elements, an alloy that can withstand prolonged heat treatment at 300°C was developed.

Free Research Field

材料組織学

Academic Significance and Societal Importance of the Research Achievements

この研究成果により、300℃下でも400MPａ超級の引張強度を持つ材料を創製できた。しかしながら、自動車用途に使用するにはスカンジウムは高価な添加元素である。そこで、航空宇宙産業での使用を念頭に今後の発展研究を続けていく。航空宇宙産業で使用することで、大幅な軽量化が望め、打ち上げコストや燃費向上に役立つと考えている。