Materials Transactions Online

Materials Transactions, Vol.60 No.09 (2019) pp.1763-1768
© 2019 The Japan Institute of Metals and Materials

Effects of Fe on Microstructures and Mechanical Properties of Ti-15Nb-25Zr-(0, 2, 4, 8)Fe Alloys Prepared by Spark Plasma Sintering

Qiang Li1, Xufeng Yuan1, Junjie Li2, Pan Wang3, Masaaki Nakai4, Mitsuo Niinomi1, 5, 6, 7, Takayoshi Nakano6, Akihiko Chiba5, Xuyan Liu1 and Deng Pan8, 9

1School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
2International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga, Braga 4715-330, Portugal
3Singapore Institute of Manufacturing Technology, 73 Nanyang Drive, 637662, Singapore
4Department of Mechanical Engineering, Faculty of Science and Engineering, Kindai University, Higashiosaka 577-8502, Japan
5Institute for Materials Research, Tohoku University, Sendai 980-5377, Japan
6Department of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
7Department of Materials Science and Engineering, Graduate School of Science and Technology, Meijo University, Nagoya 468-8502, Japan
8Materials Genome Institute, Shanghai University, Shanghai 200444, China
9Research Center for Advanced Metallic Materials, Yangtze Delta Region Institute of Tsinghua University, 705 Yatai Road, Jiaxing, Zhejiang, China

Biomedical Ti-15Nb-25Zr-(0, 2, 4, 8)Fe (mol%) alloys are prepared by mixing pure element powders and spark plasma sintering (SPS). Specimens with diameters of 20 mm and thicknesses of 3 mm are obtained by sintering at 1000°C for 10 min followed by cooling in the furnace. Some of the specimens are then heat-treated at 900°C for 1 h followed by water quenching. Zr and Fe are dissolved in Ti; however, segregation of Nb is observed in all of the alloys. The β and α′′ phases are observed in the as-sintered and heat-treated specimens owing to the insufficient diffusion of the alloying elements. Fe stabilizes the β phase and provides a solution-strengthening effect. With the increase in the Fe content in the as-sintered specimen, the compressive strength and micro-Vickers hardness are improved in the Ti-15Nb-25Zr-(0, 2, 4)Fe alloys and slightly decreased in Ti-15Nb-25Zr-8Fe. The as-sintered Ti-15Nb-25Zr-4Fe alloy exhibits the maximum compressive strength of 1740 MPa. Although the plasticity is decreased by the Fe addition, a fracture strain of approximately 17% is obtained for Ti-15Nb-25Zr-4Fe, indicating a good plasticity. The heat treatment cannot eliminate the segregation of Nb, but can improve the plasticity and slightly increase the strengths of Ti-15Nb-25Zr-(0, 2, 4)Fe. Moreover, the heat-treated Ti-15Nb-25Zr-8Fe exhibits a high strength of approximately 1780 MPa and fracture strain of approximately 19%. Therefore, good comprehensive mechanical properties, including high strengths, high hardnesses, and good plasticities, can be obtained in Fe-added β-Ti alloys prepared by SPS and subsequent optional short heat treatment.

[doi:10.2320/matertrans.ME201913]

(Received 2019/01/29; Accepted 2019/03/29; Published 2019/08/25)

Keywords: spark plasma sintering, Ti alloy, compression, Fe

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