Microstructure Modification of Bio-degradable Magnesium Alloy aiming at the optimization of surface property and corrosion performance

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K03868
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: ZHU JIANG 東京工業大学, 工学院, 助教 (70509330)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 塑性加工 / 組織制御 / バニシング加工 / 表面処理 / 生体吸収材料

Outline of Final Research Achievements

Magnesium-based alloys are considered ideal materials for implants in orthopedic treatment. However, a major issue for actual　application is that the corrosion speed of Mg alloys　is too high in aggressive environments.　In this research, burnishing process, which is a mechanical surface finishing process, is proposed　to improve the corrosion resistance of Mg alloys by　changing its surface properties. The influence of the　burnishing parameters on the surface propertied, such as surface roughness, hardness, residual stress, grain size and grain orientation, was investigated. After that, the corrosion resistance performance of the processed specimens was　investigated. It was confirmed that the proposed method is effective to improve the corrosion resistance of biodegradable magnesium alloy, and the mechanism of corrosion resistance enhancement of the proposed method was clarified.

Free Research Field

生産工学，材料工学

Academic Significance and Societal Importance of the Research Achievements

生体吸収マグネシウム合金は非常に魅力的なインプラント材料であり，ドイツ・ハノーバー大学のグループが中心として研究が開始され，近年米国，英国，および中国にも数多くの研究がなされている．一方，医療分野の市場が大きい日本では，マグネシウム合金の医療応用の研究が限られており，多くのインプラント製品は欧米から輸入されているのが現状である．本研究では，マグネシウム合金の医療用デバイス材料としての実用化を進めるための基盤技術であり，日本の高度なものづくり技術および加工技術と融合することにより，マグネシウム合金を用いた医療用デバイスの実用化が期待される．