title: Fabrication of low-cost beta-type Ti-Mn alloys for biomedical applications by metal injection molding process and their mechanical properties.
abstract: Titanium and its alloys are suitable for biomedical applications owing to their good mechanical properties and biocompatibility. Beta-type Ti-Mn alloys (8-17 mass% Mn) were fabricated by metal injection molding (MIM) as a potential low cost material for use in biomedical applications. The microstructures and mechanical properties of the alloys were evaluated. For up to 13 mass% Mn, the tensile strength (1162-938MPa) and hardness (308-294HV) of the MIM fabricated alloys are comparable to those of Ti-Mn alloys fabricated by cold crucible levitation melting. Ti-9Mn exhibits the best balance of ultimate tensile strength (1046MPa) and elongation (4.7%) among the tested alloys, and has a Young's modulus of 89GPa. The observed low elongation of the alloys is attributed to the combined effects of high oxygen content, with the presence of interconnected pores and titanium carbides, the formation of which is due to carbon pickup during the debinding process. The elongation and tensile strength of the alloys decrease with increasing Mn content. The Ti-Mn alloys show good compressive properties, with Ti-17Mn showing a compressive 0.2% proof stress of 1034MPa, and a compressive strain of 50%.
authors.affiliation: Department of Metallurgy, Materials Science and Materials Processing, Tohoku University, 6-6 Aoba, Aramaki, Aoba-Ku, Sendai, Miyagi 980-8579, Japan. Electronic address: pedro@imr.tohoku.ac.jp.
authors.forename: Pedro Fernandes
authors.initials: PF
authors.lastname: Santos
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan. Electronic address: niinomi@imr.tohoku.ac.jp.
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Niinomi
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
authors.forename: Huihong
authors.initials: H
authors.lastname: Liu
authors.affiliation: Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Cho
authors.affiliation: Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Nakai
authors.affiliation: Hamamatsu Technical Support Center Industrial Research Institute of Shizuoka Prefecture, 1-3-3 Shinmiyakoda, Kita-ku, Hamamatsu, Shizuoka 431-2103, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Itoh
authors.affiliation: Graduate School of Engineering, Tohoku University, 6-6-02 Aza Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Narushima
authors.affiliation: Faculty of Chemistry, Materials and Bioengineering, Kansai University, Suita, Osaka 564-8680, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ikeda
mesh_terms: D000497:Alloys; D019245:Compressive Strength; D055119:Elastic Modulus; D006244:Hardness; D008345:Manganese; D008422:Materials Testing; D011474:Prosthesis Design; D013718:Tensile Strength; D014025:Titanium
chemical_list: D000497:Alloys; D008345:Manganese; D014025:Titanium
keywords: Low-cost Ti alloy; Mechanical properties; Metal injection molding; Ti–Mn alloys; β phase