Microstructures and Mechanical Behaviors of Ti-30Nb-1Fe-χHf Alloys

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Effects of iron (1 mass%) and hafnium (1—7 mass%) on the microstructure and mechanical properties of Ti-30Nb base alloys were investigated in this study. Experimental results indicate that the addition of 1 mass% Fe to the Ti-30Nb alloy transforms the original α + β + ω structure into a single β phase structure. Accompanying the structure change, both the tensile strength and 0.2% proof stress were reduced by some 15%, while the elastic modulus was reduced from 80 GPa to 68 GPa. Regarding the effect of Hf, precipitation of sporadic ω phase in the otherwise complete β phase structure can be detected when hafnium is added. An addition of just 1 mass% Hf to the Ti-30Nb-1Fe alloy increases the tensile strength and 0.2% proof stress by 32% and 27%, respectively, while slightly decreasing the elastic modulus by some 10%. The Ti-30Nb-1Fe-1Hf alloy has relatively high strength (∼914 MPa T.S.), reasonable ductility (∼10% El), and an elastic modulus of around 62 GPa. Consequently, the ratio of 0.2% proof stress to elastic modulus increases moderately. The ratio of 0.2% proof stress to elastic modulus of Ti-30Nb-1Fe-1Hf was found to be 1.39 × 10<SUP>−2</SUP>, which was around 1.8 times higher than Ti-6Al-4V (0.78 × 10<SUP>−2</SUP>), and around 3.5 times higher than c.p.Ti (0.4 × 10<SUP>−2</SUP>). Hafnium content exceeding 1 mass% gives no further improvement in the ratio of 0.2% proof stress to elastic modulus. From the results obtained here, Ti-30Nb-1Fe-1Hf alloy has excellent potential for orthopedic implant applications.

収録刊行物

  • Materials transactions

    Materials transactions 45(7), 2449-2455, 2004-07-20

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10013337895
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    13459678
  • NDL 記事登録ID
    7016298
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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