Minoru Nishida
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View article: Effect of Atomic Ordering of DO3 Precipitates on Superelasticiy and Functional Fatigue of Iron-Based Shape Memory Alloy FeMnAlNiTi
Effect of Atomic Ordering of DO3 Precipitates on Superelasticiy and Functional Fatigue of Iron-Based Shape Memory Alloy FeMnAlNiTi Open
Iron-based shape memory alloy FeMnAlNiTi that exhibits over 400 °C temperature window of superelasticity and near-zero temperature dependence of transformation stress has garnered significant attention in the scientific community. Presence…
View article: Lattice Parameters of B2 and B19′ Phases in Ti–Ni Alloys Near Transformation Temperatures: Effects of Ni Concentration and Temperature
Lattice Parameters of B2 and B19′ Phases in Ti–Ni Alloys Near Transformation Temperatures: Effects of Ni Concentration and Temperature Open
The Ni concentration and temperature dependence of the lattice parameters of the B2 and B19′ phases in binary Ti–Ni alloys was systematically clarified near the martensitic transformation temperatures, using samples with finely varied Ni c…
View article: Transformation Behaviors and Microstructure Modifications in Hydrogen-Charged Ti–Ni Shape Memory Alloy
Transformation Behaviors and Microstructure Modifications in Hydrogen-Charged Ti–Ni Shape Memory Alloy Open
The effect of hydrogen charging duration on the transformation behavior, microstructural evolution, and dynamic microstructural changes associated with thermoelastic martensitic transformation in Ti–Ni shape memory alloy was investigated. …
View article: Hydrogen-induced phase with martensitic-like characteristics in Ti-Ni shape memory alloys
Hydrogen-induced phase with martensitic-like characteristics in Ti-Ni shape memory alloys Open
It has been reported that functional and mechanical properties of Ti-Ni shape memory alloys could be degraded by hydrogen absorption. Many studies have indicated the formation of a hardened layer on the surface in hydrogen-absorbed Ti-Ni a…
View article: Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite
Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite Open
To quantitatively evaluate the three-dimensional lamellar curvature in pearlitic steel, the crystallographic orientation rotation of ferrite and cementite was analyzed using scanning electron microscopy and electron backscattering diffract…
View article: Feasibility of Roll-Threading Superelastic Cu-Al-Mn SMA Rods
Feasibility of Roll-Threading Superelastic Cu-Al-Mn SMA Rods Open
This paper examines the feasibility of roll-threading superelastic Cu-Al-Mn shape memory allow (SMA) rods. The key idea behind this study was to perform roll-threading between quenching and aging, where cold workability of the material is …
View article: Effect of Ni Concentrations and C/O Ratios on the Stability of Nonmetallic Inclusions in Ni-Rich Ti-Ni Alloys
Effect of Ni Concentrations and C/O Ratios on the Stability of Nonmetallic Inclusions in Ni-Rich Ti-Ni Alloys Open
The effects of Ni concentrations and carbon to oxygen (C/O) ratios on the phase formation during the commercial production process and morphology of nonmetallic inclusions were investigated in Ni-rich Ti-Ni alloys. In the process from cast…
View article: Comparison of <i>In Situ</i> SEM and TEM Observations of Thermoelastic Martensitic Transformation in Ti–Ni Shape Memory Alloy
Comparison of <i>In Situ</i> SEM and TEM Observations of Thermoelastic Martensitic Transformation in Ti–Ni Shape Memory Alloy Open
To quantitatively understand the thin foil effect in in situ observations of the B2 to B19′ transformation in Ti–Ni alloy, the microstructure of the B19′ martensite in thin foil and bulk specimens was compared. The transformation temperatu…
View article: Novel −75°C SEM cooling stage: application for martensitic transformation in steel
Novel −75°C SEM cooling stage: application for martensitic transformation in steel Open
Microstructural changes during the martensitic transformation from face-centred cubic (FCC) to body-centred cubic (BCC) in an Fe-31Ni alloy were observed by scanning electron microscopy (SEM) with a newly developed Peltier stage available …
View article: Effect of Lattice Defects on Tribological Behavior for High Friction Coefficient under TCP Added PAO Lubrication in Nanostructured Steels
Effect of Lattice Defects on Tribological Behavior for High Friction Coefficient under TCP Added PAO Lubrication in Nanostructured Steels Open
The effect of lattice defects on the tribological behavior under tricresyl phosphate (TCP) added poly-α-olefin (PAO) lubrication was investigated in the nanostructured steels produced by heavy plastic deformation processes.In surface-nanos…
View article: Elemental Distribution near the Grain Boundary in a Nd–Fe–B Sintered Magnet Subjected to Grain-Boundary Diffusion with Dy<sub>2</sub>O<sub>3</sub>
Elemental Distribution near the Grain Boundary in a Nd–Fe–B Sintered Magnet Subjected to Grain-Boundary Diffusion with Dy<sub>2</sub>O<sub>3</sub> Open
We have investigated the microstructure in a Nd–Fe–B sintered magnet subjected to the grain-boundary diffusion (GBD) process with Dy2O3. It was found that thin (Nd,Dy)2Fe14B shells with a thickness of at least 10 nm and an average Dy conce…
View article: Isothermal Martensitic Transformations in an Aged Ni-Rich Ti–Ni Alloy Containing Coherent Ti<sub>3</sub>Ni<sub>4</sub> Particles
Isothermal Martensitic Transformations in an Aged Ni-Rich Ti–Ni Alloy Containing Coherent Ti<sub>3</sub>Ni<sub>4</sub> Particles Open
The time dependence nature of B2 (ordered cubic) to R (trigonal) and R to B19′ (monoclinic) martensitic transformations in an aged Ni-rich Ti–Ni alloy was investigated by electrical resistivity measurements. Both B2 to R and R to B19′ tran…
View article: Microstructural Characterization of Martensite with Long Period Stacking Order Structure in Hf–Co–Pd Alloy
Microstructural Characterization of Martensite with Long Period Stacking Order Structure in Hf–Co–Pd Alloy Open
Microstructural characterization of martensite with long period stacking order (LPSO) structure in a Hf–Co–Pd alloy was investigated by transmission electron microscopy (TEM) and high-angle annular dark-field scanning transmission electron…
View article: Effect of Nonmetallic Inclusions on Fatigue Properties of Superelastic Ti-Ni Fine Wire
Effect of Nonmetallic Inclusions on Fatigue Properties of Superelastic Ti-Ni Fine Wire Open
This study investigated the effects of the types and length of nonmetallic inclusions on fatigue properties in rotating bending fatigue testing of Ti-Ni alloy fine wire. It was fabricated to include titanium carbides Ti(C,O) and titanium o…
View article: Microstructure and Martensitic Transformation Behavior in Thermal Cycled Equiatomic CuZr Shape Memory Alloy
Microstructure and Martensitic Transformation Behavior in Thermal Cycled Equiatomic CuZr Shape Memory Alloy Open
Equiatomic CuZr alloy undergoes a martensitic transformation from the B2 parent phase to martensitic phases (P21/m and Cm) below 150 °C. We clarified the effect of the thermal cycling on the morphology and crystallography of martensite in …
View article: Microstructure and Martensitic Transformation Behavior in Thermal Cycled Equiatomic Cuzr Shape Memory Alloy
Microstructure and Martensitic Transformation Behavior in Thermal Cycled Equiatomic Cuzr Shape Memory Alloy Open
Equiatomic CuZr alloy undergoes a martensitic transformation from the B2 parent phase to martensitic phases (P21/m and Cm) below 150 °C. We clarified the effect of the thermal cycling on the morphology and crystallography of martensite…
View article: Long-period Stacking Ordered Structure of Martensite in Zr-Co Based Alloys
Long-period Stacking Ordered Structure of Martensite in Zr-Co Based Alloys Open
HAADF STEM (high angle annular dark field scanning transmission electron microscopy), LPSO (long period stacking ordered struc- ture), Zr Co based alloy TEM specimen preparation: Electropolishing in an electrolyte solution consisting …
View article: Characterization of Antiphase Boundary-Like Structure of B33 Martensite in Zr–Co–Pd Alloy
Characterization of Antiphase Boundary-Like Structure of B33 Martensite in Zr–Co–Pd Alloy Open
The antiphase boundary (APB)-like structure of B33 martensite in a Zr–Co–Pd alloy was investigated by means of conventional transmission electron microscopy and high-angle annular dark-field scanning transmission electron microscopy. The A…
View article: Phase Diagram of near Equiatomic Zr-Pd Alloy
Phase Diagram of near Equiatomic Zr-Pd Alloy Open
The exact eutectoid and peritectoid temperatures in near equiatomic Zr-Pd compositions have been determined by using the diffusion couple method and microstructure analysis. The crystal structure of Zr13Pd12 compound were estimated to be o…
View article: Rolling Contact Fatigue Behavior in Surface Nanostructured Steels
Rolling Contact Fatigue Behavior in Surface Nanostructured Steels Open
Surface nanostructured S45C, Si+B added S45C (S45C(Si+B)) and SCM440H steels were prepared by surface nanostructured wearing (SNW) and subsequent induction heating and quenching (IHQ). The Vickers hardness values at the top surface of thes…
View article: Influence of Desorption Recombination Temperatures on Microstructure and Coercivity of HDDR-Processed Anisotropic Nd-Fe-B Magnet Powders
Influence of Desorption Recombination Temperatures on Microstructure and Coercivity of HDDR-Processed Anisotropic Nd-Fe-B Magnet Powders Open
In the hydrogenation-decomposition-desorption-recombination (HDDR) processed Nd-Fe-Co-B-Al-Ga-Zr magnet powders, influence of the desorption-recombination (DR) temperatures on the microstructures was investigated by high-resolution scannin…