Development of low-Young’s modulus Ti–Nb-based alloys with Cr addition

Qiang Li, Guanghao Ma, Junjie Li, Mitsuo Niinomi, Masaaki Nakai, Yuichro Koizumi, Dai Xiu Wei, Tomoyuki Kakeshita, Takayoshi Nakano, Akihiko Chiba, Xuyan Liu, Kai Zhou, Deng Pan

研究成果: Article査読

19 被引用数 (Scopus)


Different amounts of Cr were added to a metastable β-type Ti–22Nb (at.%) alloy to obtain desirable mechanical properties, including a low Young’s modulus, high strength, and good plasticity. The mechanical properties and microstructural changes were investigated. Cr has a high ability to stabilize the β phase, as well as suppress both α″ martensite and ω phase transformations during quenching and the stress-induced α″ martensite transformation during tension. Solid solution strengthening is scarcely achieved by Cr addition. The changes in mechanical properties can be attributed to the different β stabilities. The Ti–22Nb–(0,1)Cr alloys have metastable β phases and exhibit double yielding phenomena, indicating a stress-induced α″ martensite transformation. The Ti–22Nb–(2,3)Cr alloys with stable β phases exhibit distinct work hardening caused by a {332}β<113>β twinning, which also occurs in the Ti–22Nb–(0,1)Cr alloys, but not in the Ti–22Nb–4Cr alloy. Low Young’s moduli of approximately 60 GPa are obtained for the Ti–22Nb–(1,2)Cr alloys. The Ti–22Nb–2Cr alloy exhibits desirable properties for biomedical applications, including an ultimate tensile strength of approximately 600 MPa and elongation of approximately 20%.

ジャーナルJournal of Materials Science
出版ステータスPublished - 2019 6月 15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学


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