軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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66 巻, 10 号
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研究論文
  • チタンとコバルトの腐食反応を用いたCoTiO3の合成
    寺本 勝輝, 佐々木 大地, 世利 修美
    2016 年 66 巻 10 号 p. 527-530
    発行日: 2016/10/30
    公開日: 2016/11/30
    DOIhttps://doi.org/10.2464/jilm.66.527
    ジャーナル フリー
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    Attempt has been made to obtain cobalt titanate (CoTiO3) by application of the corrosion synthesis. Solution with cobalt ions which has been obtained by dissolution of metallic cobalt in a mixture of hydrogen peroxide and citric acid solution was poured into the prepared solution with peroxotitanate ions which has been obtained by dissolution of metallic titanium in a mixture of hydrogen peroxide, ammonia and citric acid solutions. When the mixed solution above has been well-stirred and dried for a period 86.4 ks at a temperature of 373 K, then greenish oxide powder was obtained. The powder was calcinated for the period of 3.6 ks at temperatures of 873 K, 1073 K, 1273 K, and 1473 K. The calcinated powder was investigated by the XRD analysis and then identified as CoTiO3.

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  • Ti–4.5Al–2Mo–1.6V–0.5Fe–0.3Si合金の強度–延性バランスに及ぼす組織因子と変形機構
    南埜 皓哉, 松本 洋明
    2016 年 66 巻 10 号 p. 531-537
    発行日: 2016/10/30
    公開日: 2016/11/30
    DOIhttps://doi.org/10.2464/jilm.66.531
    ジャーナル フリー
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    The effects of difference in morphology, grain size and β fraction on tensile properties in Ti–4.5Al–2Mo–1.6 V–0.5Fe–0.3Si (Ti-9) alloy were quantitatively examined. Excellent balance of strength and ductility is exhibited in the bimodal morphology. Refinement of α-grain size results in simultaneous increase in strength and ductility. Herein, the Hall–Petch coefficients in the equiaxed morphology and bimodal morphology exhibit similar value of approximately 230 MPa/(µm−1/2), implying that the similar Hall–Petch effect is acted for both morphologies. During deformation, twinning in the α phase does not activate. On the other hand, according to the experimental results on strength and the Schmid law, we can speculate that 〈c+a〉 dislocation slip activates easier than the case in the Ti–6Al–4V alloy. In Ti-9 alloy, it is supposed that suppression of planar-dislocation-motion (under deformation) due to the decrease in Al content and the accommodation of strain incompatibility at α/β interface contribute to improve the ductility.

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