Author
Yukichi Umakoshi
Other affiliations: Kyushu University, National Institute for Materials Science
Bio: Yukichi Umakoshi is an academic researcher from Osaka University. The author has contributed to research in topics: Slip (materials science) & Amorphous metal. The author has an hindex of 39, co-authored 388 publications receiving 7552 citations. Previous affiliations of Yukichi Umakoshi include Kyushu University & National Institute for Materials Science.
Papers published on a yearly basis
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519 citations
TL;DR: In this article, the microstructure and mechanical properties of Mg97Zn1Y2 extruded alloy, composed of a Mg matrix phase and a long-period stacking ordered phase, were investigated using compression tests at room temperature.
502 citations
TL;DR: In this paper, the plastic deformation behavior of Mg12ZnY with an 18R LPSO-structure was investigated using directionally solidified crystals, and the (0001) 2 ¯ 0> basal slip was identified to be the dominant operative deformation mode in Mg 12Znys, whose critical resolved shear stress (CRSS) was estimated to be 10-30 MPa.
391 citations
TL;DR: It was concluded that the microscale measurement of biological Ap texture is one of the useful new methods for evaluating mechanical function and stress distribution in vivo in calcified tissues.
302 citations
TL;DR: In this article, the D022-type structure of Al3Ti has been deformed under compression at 25-860°C and at temperatures above 620°C, good compression ductility is observed.
Abstract: Polycrystalline specimens of the intermetallic compound Al3Ti with the D022-type structure have been deformed under compression at 25–860°C. At temperatures below 620°C, specimens fracture with very small fracture strain since extremely localized deformation occurs and cracks are initiated in intensely deformed regions almost at yielding. At temperatures above 620°C, good compression ductility is observed. Yield stress starts decreasing rapidly with increasing temperature at around 330°C and becomes less temperature dependent above 630°C. The major mode of deformation of Al3Ti is twinning of the type (111)[112] which does not disturb the D022 symmetry of the lattice. However, at high temperatures, the four (111)[112]-type twinning systems are augmented by slip of the types [110], [100] and [010]. This would supply an explanation for the good compression ductility observed at temperatures above 620°C. Suggestions are made for further experimental work on alloying additions which may improve the du...
192 citations
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TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These
9,929 citations
TL;DR: This review comprehensively covers literature reports which have investigated specifically the effect of dissolution products of silicate bioactive glasses and glass-ceramics in relation to osteogenesis and angiogenesis and focuses on the ion release kinetics of the materials and the specific effect of the released ionic dissolution products on human cell behaviour.
2,056 citations
TL;DR: In this paper, the complexity and variety of fundamental phenomena in this material system with a focus on phase transformations and mechanical behaviour are discussed. And the challenges that lie ahead in achieving these goals are delineated.
1,797 citations
TL;DR: The development of new metallic alloys for biomedical applications is described in this paper, which includes β-type titanium alloys with a self-tunable modulus, which has been proposed for the construction of removable implants.
1,154 citations
TL;DR: In this paper, a review of the role played by biological calcium phosphates in bone regeneration is presented, where the synthesis procedures to obtain in the laboratory calcium deficient carbonate nanoapatite both in bulk and thin film forms, as well as the characterization methods applied to these materials are described.
1,014 citations