TY - JOUR
T1 - Improvement of microstructure, mechanical and corrosion properties of biomedical Ti-Mn alloys by Mo addition
AU - Fernandes Santos, Pedro
AU - Niinomi, Mitsuo
AU - Liu, Huihong
AU - Cho, Ken
AU - Nakai, Masaaki
AU - Trenggono, Adhitya
AU - Champagne, Sébastien
AU - Hermawan, Hendra
AU - Narushima, Takayuki
N1 - Funding Information:
This study was supported in part by a Grant-in-Aid for Scientific Research (A) No. 24246111 , a Grant-in-Aid for Young Scientists (B) No. 25820367 from the Japan Society for the Promotion of Science (JSPS), the Inter-University Cooperative Research Program “Innovation Research for Biosis-Abiosis Intelligent Interface” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, the Innovative Structural Materials Association (ISMA), Japan, and ICC-IMR of Tohoku University, Japan .
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/11/15
Y1 - 2016/11/15
N2 - In previous studies, Ti-Mn alloys showed promising performance for biomedical applications, but their elongation required improvement. In this study, Mo was added to Ti-Mn alloys to promote mechanical twinning and improve their ductility. Four alloys for biomedical applications were designed and fabricated by cold crucible levitation melting: Ti-5Mn-3Mo (TMM-53), Ti-5Mn-4Mo (TMM-54), Ti-6Mn-3Mo (TMM-63), and Ti-6Mn-4Mo (TMM-64). The microstructure, mechanical properties, tensile deformation mechanisms, and electrochemical corrosion properties of the alloys were evaluated. Their hardness ranges from 336 to 373 HV. Their Young's modulus ranges from 89 to 100 GPa. Both hardness and Young's modulus tend to decrease with decreasing amount of athermal ω phase, which is caused by increasing alloying elements contents. Mo addition improves the elongation of TMM-53 and TMM-54 by promoting twinning. Conversely, it increases the tensile strength of TMM-63 and TMM-64. Particularly, TMM-54 shows an elongation of 34% with an ultimate tensile strength (UTS) of 935 MPa. TMM-63 shows an elongation of 14% and a UTS of 1220 MPa, associated to the formation of deformation-induced ω phase. Moreover, Mo addition decreases the corrosion rate of the Ti-Mn alloys to a level comparable to that of commercially-pure Ti.
AB - In previous studies, Ti-Mn alloys showed promising performance for biomedical applications, but their elongation required improvement. In this study, Mo was added to Ti-Mn alloys to promote mechanical twinning and improve their ductility. Four alloys for biomedical applications were designed and fabricated by cold crucible levitation melting: Ti-5Mn-3Mo (TMM-53), Ti-5Mn-4Mo (TMM-54), Ti-6Mn-3Mo (TMM-63), and Ti-6Mn-4Mo (TMM-64). The microstructure, mechanical properties, tensile deformation mechanisms, and electrochemical corrosion properties of the alloys were evaluated. Their hardness ranges from 336 to 373 HV. Their Young's modulus ranges from 89 to 100 GPa. Both hardness and Young's modulus tend to decrease with decreasing amount of athermal ω phase, which is caused by increasing alloying elements contents. Mo addition improves the elongation of TMM-53 and TMM-54 by promoting twinning. Conversely, it increases the tensile strength of TMM-63 and TMM-64. Particularly, TMM-54 shows an elongation of 34% with an ultimate tensile strength (UTS) of 935 MPa. TMM-63 shows an elongation of 14% and a UTS of 1220 MPa, associated to the formation of deformation-induced ω phase. Moreover, Mo addition decreases the corrosion rate of the Ti-Mn alloys to a level comparable to that of commercially-pure Ti.
KW - Deformation mechanisms
KW - Electrochemical corrosion
KW - Mechanical properties
KW - Ti-Mn-Mo alloys
KW - β phase
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U2 - 10.1016/j.matdes.2016.07.115
DO - 10.1016/j.matdes.2016.07.115
M3 - Article
AN - SCOPUS:84981164551
SN - 0264-1275
VL - 110
SP - 414
EP - 424
JO - Materials and Design
JF - Materials and Design
ER -