Naoki Takata
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View article: Variations in mechanical, electrical, thermal properties, and residual stress of laser powder bed fused Al–Fe binary alloy by annealing
Variations in mechanical, electrical, thermal properties, and residual stress of laser powder bed fused Al–Fe binary alloy by annealing Open
Al–2.5 mass% Fe binary alloys were prepared by laser powder bed fusion (L-PBF), and the effects of annealing below 573 K on the electrical, mechanical, thermal properties, microstructure, and residual stress were investigated. The electric…
View article: Growth mechanisms and mechanical response of 3D superstructured cubic and hexagonal Hf1-xAlxN thin films
Growth mechanisms and mechanical response of 3D superstructured cubic and hexagonal Hf1-xAlxN thin films Open
View article: Application of four-dimensional impedance analysis to elucidating corrosion mechanisms in additively manufactured metals and alloys
Application of four-dimensional impedance analysis to elucidating corrosion mechanisms in additively manufactured metals and alloys Open
View article: Comparative study of thermodynamic calculations with solidification microstructures of Al-Si-Fe and Al-Si-Mn ternary eutectic alloys
Comparative study of thermodynamic calculations with solidification microstructures of Al-Si-Fe and Al-Si-Mn ternary eutectic alloys Open
View article: Controlling unique mechanical properties of aluminum alloys created by laser additive manufacturing
Controlling unique mechanical properties of aluminum alloys created by laser additive manufacturing Open
View article: Preface to the Special Issue “Fundamentals and Application Technologies for Microstructural Control of Hot-dip Galvanized Coatings for Creating New Functionalities”
Preface to the Special Issue “Fundamentals and Application Technologies for Microstructural Control of Hot-dip Galvanized Coatings for Creating New Functionalities” Open
View article: Effect of hydrogen on dynamic precipitation in additively manufactured aluminum alloys: Evidence for HEENT mechanism
Effect of hydrogen on dynamic precipitation in additively manufactured aluminum alloys: Evidence for HEENT mechanism Open
View article: Liquid Phase Sintering of Al Powder Using Al-X (X=Cu, Ca, Mg) Eutectic Alloy Powders: Effect of Alloy Elements and Oxide Film Thickness
Liquid Phase Sintering of Al Powder Using Al-X (X=Cu, Ca, Mg) Eutectic Alloy Powders: Effect of Alloy Elements and Oxide Film Thickness Open
Sinter-based additive manufacturing (AM) requires sintering for the densification of green bodies. Al powder is difficult to sinter due to the dense oxide film on the surface, and it is difficult to apply to sinter-based AM. Liquid phase s…
View article: Stabilization and destabilization of precipitation morphologies of T‐Al6Mg11Zn11 phase by trace element additions
Stabilization and destabilization of precipitation morphologies of T‐Al6Mg11Zn11 phase by trace element additions Open
View article: Tailoring compositional gradient in electrodeposited Ni-Co alloys to achieve strength-ductility synergy and microstructural stability at nanoscale
Tailoring compositional gradient in electrodeposited Ni-Co alloys to achieve strength-ductility synergy and microstructural stability at nanoscale Open
View article: Pressure-less Mg Melt Infiltration into Ti Powder Preform with Various Flow Channel Structures toward the Application to Binder Jetting Additive Manufacturing
Pressure-less Mg Melt Infiltration into Ti Powder Preform with Various Flow Channel Structures toward the Application to Binder Jetting Additive Manufacturing Open
View article: Capillary Performance of Bi-porous Al Fabricated Using Space Holders with Different Sizes
Capillary Performance of Bi-porous Al Fabricated Using Space Holders with Different Sizes Open
View article: Metal-like ductility and high hardness in nitrogen-rich HfN thin films by point defect superstructuring
Metal-like ductility and high hardness in nitrogen-rich HfN thin films by point defect superstructuring Open
The strength of refractory ceramics is much limited by their brittleness. Counterintuitively, we observe simultaneous high hardness and metallic-like ductility in highly overstoichiometric single-crystal HfN 1.22 and HfN 1.33 films grown b…
View article: Inhomogeneous α-Al/Mg2Si two-phase microstructures with chemical fluctuation produced by laser-beam powder bed fusion
Inhomogeneous α-Al/Mg2Si two-phase microstructures with chemical fluctuation produced by laser-beam powder bed fusion Open
This study investigated the additive manufacturing of high-strength Al–Mg–Si ternary alloy with refined α-Al/Mg2Si two-phase microstructures by laser-beam powder bed fusion (PBF-LB). Although PBF-LB processing produced crack-free samples w…
View article: Processability and Microstructural Morphology of γ-Fe/Fe<sub>2</sub>Nb Two-Phase Eutectic Alloy Manufactured by Laser Powder Bed Fusion
Processability and Microstructural Morphology of γ-Fe/Fe<sub>2</sub>Nb Two-Phase Eutectic Alloy Manufactured by Laser Powder Bed Fusion Open
View article: Role of Si Addition in Interfacial Reactions of Steel Sheets Hot-dipped in Zn–55%Al Alloy Melt
Role of Si Addition in Interfacial Reactions of Steel Sheets Hot-dipped in Zn–55%Al Alloy Melt Open
View article: Combined Metal-like Ductility and High Hardness in N-rich HfN Thin Films by Point Defect Superstructuring
Combined Metal-like Ductility and High Hardness in N-rich HfN Thin Films by Point Defect Superstructuring Open
The strength of refractory ceramics is much limited by their brittleness. Counterintuitively, we observe simultaneous high hardness and metallic-like ductility in highly overstoichiometric single-crystal HfN1.22 and HfN1.33…
View article: Formation Behavior of Fe–Zn Intermetallic Layers at the Interface between Fe–Mn and Pure Zn Melt at 460°C
Formation Behavior of Fe–Zn Intermetallic Layers at the Interface between Fe–Mn and Pure Zn Melt at 460°C Open
View article: Enhancing Capillary Pressure of Porous Aluminum Wicks by Controlling Bi-Porous Structure Using Different-Sized NaCl Space Holders
Enhancing Capillary Pressure of Porous Aluminum Wicks by Controlling Bi-Porous Structure Using Different-Sized NaCl Space Holders Open
Capillary pressure and permeability of porous media are important for heat transfer devices, including loop heat pipes. In general, smaller pore sizes enhance capillary pressure but decrease permeability. Introducing a bi-porous structure …
View article: Fe/polymer joining via Fe/TiB2 composite structures via in-situ laser-induced reaction of Fe-Ti-B system: Effect of powder composition
Fe/polymer joining via Fe/TiB2 composite structures via in-situ laser-induced reaction of Fe-Ti-B system: Effect of powder composition Open
Achieving strong direct joining between steel and polymers through mechanical interlocking is crucial for developing multi-material structures, particularly in the automotive and aerospace industries. This study synthesized micro-scale str…
View article: Variation in microstructural features of melt-pool structure in laser powder bed fused Al–Fe–Cu alloy at elevated temperatures
Variation in microstructural features of melt-pool structure in laser powder bed fused Al–Fe–Cu alloy at elevated temperatures Open
The present study was undertaken to understand the effect of annealing on the microstructural features of the melt-pool structure and the associated multiscale mechanical properties of the Al–2.5%Fe–2%Cu alloy manufactured by laser powder …
View article: Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion
Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion Open
This study reports an anomalous temperature-dependent tensile behavior of laser-beam powder bed fusion (PBF-LB) processed Cu–Cr–Zr alloy. The yield strength of the alloy initially decreases as the temperature increases to 200±5 MPa and the…
View article: Pressure-less melt infiltration characteristics of Mg melt into Ti powder preforms with various pore structures: Toward the application to the binder jetting additive manufacturing
Pressure-less melt infiltration characteristics of Mg melt into Ti powder preforms with various pore structures: Toward the application to the binder jetting additive manufacturing Open
Binder jetting (BJT) additive manufacturing enables the fabrication of complex-shaped metallic parts but requires sintering as post-processing to obtain dense parts. The sintering inevitably causes the shrinkage from green body to dense pr…
View article: Effect of heat treatments on inhomogeneous deformation of the melt-pool structure of Al–Si alloy manufactured via laser powder bed fusion
Effect of heat treatments on inhomogeneous deformation of the melt-pool structure of Al–Si alloy manufactured via laser powder bed fusion Open
Laser powder bed fusion (L-PBF) is an additive manufacturing technology widely applied to the manufacture of metallic parts. The L-PBF processed aluminum-silicon (Al–Si) cast-type alloy components exhibit an anisotropic tensile ductility. …
View article: Formation Behavior of Fe–Zn Intermetallic Layers at the Interface between Fe–Mn and Pure Zn Melt at 460°C
Formation Behavior of Fe–Zn Intermetallic Layers at the Interface between Fe–Mn and Pure Zn Melt at 460°C Open
The effect of Mn on the alloying reaction during hot-dip galvanization was investigated. The microstructure of the Fe–Zn intermetallic layers consisted of ζ, δ, and Γ phases for both pure Fe and Fe–2Mn (wt.%) alloy. The intermetallic layer…
View article: Utilization of Computation/Data Sciences for High Functionality of Lattice Structures Created by Metal Additive Manufacturing Technologies
Utilization of Computation/Data Sciences for High Functionality of Lattice Structures Created by Metal Additive Manufacturing Technologies Open
View article: Thermal stability of refined Al6(Fe, Mn) phase formed in laser powder bed fusion process
Thermal stability of refined Al6(Fe, Mn) phase formed in laser powder bed fusion process Open
The addition of Mn in Al–Fe alloys stabilizes the Al6Fe metastable phase (orthorhombic structure, oC28) owing to the partial occupation of Fe sublattice sites by Mn atoms (formation of Al6(Fe, Mn) phase), thereby achieving superior high-te…
View article: Introducing Hatch Spacing into Deposited Energy Density toward Efficient Optimization of Laser Powder Bed Fusion Process Parameters
Introducing Hatch Spacing into Deposited Energy Density toward Efficient Optimization of Laser Powder Bed Fusion Process Parameters Open
The optimization of processing parameters is indispensable for the laser powder bed fusion (L-PBF) process. The deposited energy density (DED) is one of the process indexes for the L-PBF process and has a simplified formula of P·v-0.5, whe…
View article: Effect of Cr content on thermally activated deformation in single-crystal micropillars of Fe–Cr binary alloys
Effect of Cr content on thermally activated deformation in single-crystal micropillars of Fe–Cr binary alloys Open
This study identifies the role of solute Cr in the thermal activation process in the plastic deformation of α-(Fe, Cr) ferrite (BCC solid solutions) using micropillar compression tests for micron-sized single-crystals fabricated on various…
View article: Four-dimensional electrochemical impedance spectroscopy: Role of microstructure on corrosion behaviour of Al-Si alloys additive-manufactured by laser powder bed fusion
Four-dimensional electrochemical impedance spectroscopy: Role of microstructure on corrosion behaviour of Al-Si alloys additive-manufactured by laser powder bed fusion Open
Four-dimensional (4D) electrochemical impedance spectroscopy was applied to clarify the role of microstructures on the corrosion behaviour of Al-Si alloys additively manufactured by laser powder bed fusion in the immersion of NaCl solution…