Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 66, Issue 10
Displaying 1-4 of 4 articles from this issue
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RESEARCH ARTICLE
  • Preparation of CoTiO3 by corrosion reactions of titanium and cobalt
    Masaki Teramoto, Daichi Sasaki, Osami Seri
    2016 Volume 66 Issue 10 Pages 527-530
    Published: October 30, 2016
    Released on J-STAGE: November 30, 2016
    DOIhttps://doi.org/10.2464/jilm.66.527
    JOURNAL FREE ACCESS
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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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  • Microstructural effect on strength–ductility balance and deformation mode of Ti–4.5Al–2Mo–1.6V–0.5Fe–0.3Si alloy
    Koya Minamino, Hiroaki Matsumoto
    2016 Volume 66 Issue 10 Pages 531-537
    Published: October 30, 2016
    Released on J-STAGE: November 30, 2016
    DOIhttps://doi.org/10.2464/jilm.66.531
    JOURNAL FREE ACCESS
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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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