High effective strengthening of metallic implants made of metals with self-tunable elastic modulus by partial deformation

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13825
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Kindai University (2016); Tohoku University (2015)
• Principal Investigator: NAKAI Masaaki 近畿大学, 理工学部, 准教授 (20431603)
• Co-Investigator(Renkei-kenkyūsha): SOYAMA Hitoshi 東北大学, 大学院工学研究科, 教授 (90211995) ; ISHIMOTO Takuya 大阪大学, 大学院工学研究科, 准教授 (50508835)
• Research Collaborator: NARITA Kengo
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 生体材料 / チタン合金 / 変形誘起相変態 / オメガ相 / 疲労特性 / 表面硬化処理

Outline of Final Research Achievements

The metals with self-tunable elastic modulus exhibit low elastic moduli before deformation, and their elastic moduli increase during deformation by deformation-induced phase transformation. In this study, we tried to achieve both low elastic modulus and high durability using these metals deformed partially at the position where high strength is required. In order to deform only at the surface of the metals, peening treatment was employed. As the results, the durability of the metals was increased significantly by the peening treatment in comparison with that of the other metals without deformation-induced phase transformation. According to the microstructure observation, deformation-induced ω phase was observed only near the surface of the specimens after the peening treatment. Therefore, it is possible to increase the durability without increase in elastic modulus by partial deformation for these metals.

Free Research Field

材料工学