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Erschienen in: Journal of Materials Engineering and Performance 6/2022

14.03.2022 | Technical Article

Microstructure, Mechanical Properties, and Cytotoxicity of β-Type Ti-Nb-Cr Alloys Designed by Electron Parameter

verfasst von: Qiang Li, Fei Li, Junjie Li, Zhi Gao, Ke Zhang, Mitsuo Niinomi, Takayoshi Nakano

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 6/2022

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Abstract

A series of β-type Ti-(24-2x)Nb-xCr (at%) (x=0, 1, 2, 3, 4, 5) alloys were designed by using Cr to replace Nb with a fixing average valence electron number (valence electron/atom ratio, e/a ratio) of 4.24. The alloys were prepared by arc melting and then subjected to homogenization, cold rolling and solution treatment. The phases and microstructures were analyzed by x-ray diffraction and optical microscopy. The mechanical properties were measured by tensile tests. The cytotoxicity was evaluated by detecting the proliferation of MC3T3-E1 cells after several days' culture. With the increase of Cr content, the β stability of the studied Ti-Nb-Cr alloys is gradually increased. Stress-induced martensite transformation is found in Ti-24Nb and Ti-22Nb-1Cr and suppressed by more Cr addition. Nonlinear deformation and twinning appear in all the alloys indicating that the β phases are all metastable. The 0.2 % proof stress increases with increase of Cr owing the enhanced β stability and solid solution strengthening effect due to Cr addition. Obvious dynamic reinforcement during deformation is found in Ti-22Nb-1Cr leading to higher tensile strength than those of Ti-24Nb and Ti-20Nb-2Cr. The tensile strength continuous increases with Cr content increasing from 2 to 5 %. Cytotoxicity is not found in Ti-24Nb and Ti-16Nb-4Cr by observing the growth of mice pre-osteoblast line MC3T3-E1. Ti-16Nb-4Cr shows good comprehensive mechanical properties and non-cytotoxicity, and is a potential candidate for biomaterials.

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Metadaten
Titel
Microstructure, Mechanical Properties, and Cytotoxicity of β-Type Ti-Nb-Cr Alloys Designed by Electron Parameter
verfasst von
Qiang Li
Fei Li
Junjie Li
Zhi Gao
Ke Zhang
Mitsuo Niinomi
Takayoshi Nakano
Publikationsdatum
14.03.2022
Verlag
Springer US
Erschienen in
Journal of Materials Engineering and Performance / Ausgabe 6/2022
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-022-06586-x

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