β-Phase Instability and Effects on the Physical Properties in Binary Ti-Nb Biomaterial Single Crystals

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  • Wang Pan
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Todai Mitsuharu
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Nakano Takayoshi
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

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  • 生体用 Ti-Nb 二元系合金単結晶における β 相の不安定性とその基礎物性への影響
  • セイタイヨウ Ti-Nb ニゲンケイ ゴウキンタンケッショウ ニ オケル vソウ ノ フアンテイセイ ト ソノ キソ ブッセイ エ ノ エイキョウ
  • ^|^beta;-Phase Instability and Effects on the Physical Properties in Binary Ti-Nb Biomaterial Single Crystals

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Abstract

  The ω-phase transformation and β-phase stability in Ti-xNb (28≤x≤40 at%) single crystals were investigated using electrical resistivity measurements, transmission electron microscopy (TEM) observations, and specific heat measurements. The crystal for x=28 exhibits distinct anomalous negative temperature dependence of the resistivity coefficient and thermal hysteresis accompanied by the presence of the athermal ω-phase and β-phase lattice modulation. Although the crystal for x=30 appears in the β-phase lattice modulation, it does not exhibit a clear negative temperature dependence of the resistivity coefficient or the athermal ω-phase. The crystal of x=30 also shows a relatively high absolute value of resistivity at 15 K among the crystals for 28≤x≤40 and a low Debye temperature in a normal conductive state. The crystal for x=30 that shows the lattice modulation, high resistivity, and low β-phase Debye temperature corresponds to the low stability of the β-phase. Moreover, the stability strongly depends on the Nb content in the binary Ti-Nb crystal.<br>

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