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Somekawa, Hidetoshi*; Basha, D. A.*; Singh, A.*; Tsuru, Tomohito; Watanabe, Hiroyuki*
Philosophical Magazine Letters, 100(10), p.494 - 505, 2020/10
Times Cited Count：10 Percentile：52.47(Materials Science, Multidisciplinary)The damping capacity in the vicinity of {10
2} twin boundaries was measured before and after annealing by nano-dynamic mechanical analysis. The subsequent annealing process led to a lower damping capacity in all magnesium binary alloys, which was in contrast to the results in pure magnesium. This is on account of the segregation of solute atoms in incoherent twin boundaries. The alloying elements, which have the characteristic of a low segregation energy for twin boundaries, effectively prevents the damping capacity degradation.
-martensite as an intermediate phase during the strain-induced transformation of SUS304 stainless steelHatano, Masaharu*; Kubota, Yoshiki*; Shobu, Takahisa; Mori, Shigeo*
Philosophical Magazine Letters, 96(6), p.220 - 227, 2016/06
Times Cited Count：8 Percentile：35.25(Materials Science, Multidisciplinary)We have investigated the formation process of 
'-martensite from the 
-phase induced by external strain using 
synchrotron diffraction experiments, combined with Lorentz transmission electron microscopy (TEM) and high-resolution TEM observations. It is clearly demonstrated that -martensite with hexagonal symmetry appears as an intermediate structure during the plastic deformation of SUS304 stainless steel. In addition to stacking faults and dislocations, interfaces between the twin structures presumably play a key role in the formation of -martensite.
Iguchi, Yusuke*; Mashimo, Tsutomu*; Ono, Masao; Okayasu, Satoru
Philosophical Magazine Letters, 90(7), p.513 - 518, 2010/07
Times Cited Count：4 Percentile：29.14(Materials Science, Multidisciplinary)We performed an ultracentrifuge experiment on Bi-Sb alloy. Deformation twins with misorientations of about 90 
were observed in the low-gravitational region where grain refinement had not occurred. The twins were thicker than the conventional deformation twins and their thickness was proportional to the gravitational field. We found that the minimum gravitational field required for grain refinement was 1.7
10 
G at 240 C for periods 
10 h.
Abe, Yosuke; Jitsukawa, Shiro
Philosophical Magazine Letters, 89(9), p.535 - 543, 2009/09
Times Cited Count：5 Percentile：36.24(Materials Science, Multidisciplinary)The self-guided molecular dynamics (SGMD) method which can enhance the conformational sampling efficiency in MD simulations, was applied in investigating the phase transformation of Cu precipitate in -iron that took place during thermal ageing. It was shown that the SGMD method can accelerate calculating the bcc to 9R structure transformation of a small precipitate (even 4.0 nm in size), enabling the transformation without introducing any excess vacancies. The size dependence of the transformation also agreed with that seen in previous experimental studies.
Yamashita, Shinichiro; Otsuka, Satoshi; Akasaka, Naoaki; Ukai, Shigeharu; Onuki, Somei
Philosophical Magazine Letters, 84(8), p.525 - 529, 2004/00
Times Cited Count：110 Percentile：95.97(Materials Science, Multidisciplinary)Oxide dispersion strengthened (ODS) ferritic steel including nano-scale oxide particles was produced by mechanical alloying, and its complex oxide particles comprised of titanium and yttrium (Ti-Y complex oxide) were characterized by high resolution trans,ission electron microscope (HRTEM) and X-ray nano-analyses. The crystal structure and interfacial coherency between the ferritic matrix and the major Ti-Y complex oxide were a cubic Y
TiO
and incoherent, respectively. From HRTEM and X-ray nano-analyses plus the extremely limited literature data on the ODS ferritic steels, it was considered that the most stable complex oxide in the ODS ferritic steel was a cubic YTiO and that the cubic YTiO formed due to a spontaneous reaction between ultra-fine ceramics with a low solubility limit in metals
