A5076123768- Magnesium Alloys: Properties and Applications
- Aluminum Alloys Composites Properties
- Hydrogen Storage and Materials
- Aluminum Alloy Microstructure Properties
- Metal and Thin Film Mechanics
- Corrosion Behavior and Inhibition
- Advanced Welding Techniques Analysis
- Metallic Glasses and Amorphous Alloys
- Microstructure and mechanical properties
- Quasicrystal Structures and Properties
- Catalysts for Methane Reforming
- Material Properties and Applications
- Magnetic Properties of Alloys
- Catalytic Processes in Materials Science
- Advanced ceramic materials synthesis
- Rare-earth and actinide compounds
- Acoustic Wave Resonator Technologies
- Catalysis and Hydrodesulfurization Studies
- Thermodynamic and Structural Properties of Metals and Alloys
- Material Dynamics and Properties
- Intermetallics and Advanced Alloy Properties
- Hybrid Renewable Energy Systems
- MXene and MAX Phase Materials
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
Kumamoto University
2015-2024
The University of Queensland
2015-2022
Materials Science & Engineering
2006-2015
Osaka University
2012
Kumamoto University Hospital
2006
Tohoku University
1997-2002
National Institute for Materials Science
2002
Hokkaido University
2001
We investigated the formation and mechanical properties of Mg97Zn1RE2 alloys with long-period stacking ordered (LPSO) structures by examining RE = Y, La, Ce, Pr, Sm, Nd, Gd, Dy, Ho, Er, Tb, Tm Yb. The LPSO phase developed for Tb Tm. Mg-Zn-RE are either type I, in which forms during solidification: Mg-Zn-Y, Mg-Zn-Dy, Mg-Zn-Ho, Mg-Zn-Er Mg-Zn-Tm, or II, is nonexistent as-cast ingots but precipitates soaking at 773 K: Mg-Zn-Gd Mg-Zn-Tb. criteria REs that form an discussed. phase, were worked...
The compositional dependence of mechanical properties and microstructural change the extruded Mg-Zn-Y alloys has been investigated in effort to develop a high strength alloy with long period ordered (LPO) structure. Mg96Zn2Y2 exhibited yield 390 MPa elongation 5% at room temperature, more than 300 even elevated temperature 473 K. heat-treated ingot metallurgy (I/M) containing very small amounts yttrium zinc are characterized by lamellar phase constructed 2H-Mg 14H-LPO structures. Extrusion...
A series of structural polytypes formed in an Mg-1at.%Zn-2at.%Y alloy has been identified, which are reasonably viewed as long-period stacking derivatives the hcp Mg structure with alternate AB close-packed atomic layers. Atomic-resolution Z-contrast imaging clearly revealed that structures chemical-ordered well stacking-ordered; unique chemical order along direction occurs being synchronized a local faulted AB'C'A, where B' and C' layers commonly enriched by Zn/Y atoms.
The unusual increase in the strength by extrusion is a unique feature of recently developed Mg alloys containing LPSO phase. In this study, we first elucidated detailed mechanisms that induce drastic strengthening. dependencies deformation behavior Mg88Zn4Y7 extruded alloy, which contains ∼86-vol% phase, on temperature, loading orientation, and ratio were examined. It was found yield stress alloy drastically increased extrusion, but magnitude significantly different depending orientation....
The mechanical properties of the Mg-based LPSO-phase are expected to be strongly affected by microstructure due its anisotropic crystal structure. However, fine details have not been sufficiently understood yet. This study first clarified detailed microstructural factors that govern strength examining alloys with microstructures were significantly varied via directional solidification and extrusion processes. Refining is effective for strengthening alloys. yield stress random texture was...
Mg–Zn–Y ternary alloys containing the long-period stacking ordered (LPSO) phase exhibit superior mechanical properties. This is believed to be originating from LPSO acting as strengthening phase. However, we first clarify that properties of matrix Mg solid solution in Mg/LPSO two-phase alloy are significantly different those pure Mg. The yield stress a Mg99.2Zn0.2Y0.6 single crystal (matrix solution) almost same an single-phase alloy. ascribed formation thin stacking-fault-like defects,...
A highly corrosion resistant Mg-Zn-Y-Al alloy featuring an α-Mg/LPSO two-phase multimodal microstructure was developed. The extruded Mg-Zn-Y showed orientation dependent behaviour, the longitudinal section exhibited a higher rate than transverse section. dependence attributed to varying in-plane atomic densities of crystallographic planes on and sections. LPSO phase cathode galvanic occurred in adjacent α-Mg. Al alloying into facilitated formation protective surface film, which decreased...