Ryosuke Kainuma
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View article: Shape memory alloys for cryogenic actuators
Shape memory alloys for cryogenic actuators Open
Actuators are widely used in various mechanical products. However, there have been no actuators that can exhibit high actuation stresses and strains at cryogenic temperatures. Although shape memory alloys (SMAs) are attractive candidates f…
View article: Magnetic properties and microstructures of HDDR-treated (Nd,Ce)–Fe–B magnet powders
Magnetic properties and microstructures of HDDR-treated (Nd,Ce)–Fe–B magnet powders Open
In recent years, to reduce manufacturing costs and decrease the rare-earth supply/demand imbalance in the Nd–Fe–B magnet market, (Nd,Ce)–Fe–B magnets, in which Nd is replaced by Ce, have gained significant attention. In this study, we inve…
View article: A lightweight shape-memory alloy with superior temperature-fluctuation resistance
A lightweight shape-memory alloy with superior temperature-fluctuation resistance Open
In advanced applications such as aerospace and space exploration, materials must balance lightness, functionality and extreme thermal fluctuation resistance 1,2 . Shape-memory alloys show promise with strength, toughness and substantial st…
View article: A Review on the Magnetovolume Effect of the Full Heusler Alloys Ni2MnZ (Z = In, Sn, Sb)
A Review on the Magnetovolume Effect of the Full Heusler Alloys Ni2MnZ (Z = In, Sn, Sb) Open
The full Heusler alloys Ni2MnZ (Z = In, Sn, Sb) exhibit ferromagnetic properties with a Curie temperature (TC) above room temperature. The magnetic properties of Ni2MnZ (Z = In, Sn, Sb) were studied through a combination of experiments and…
View article: A super-elastic alloy hallux valgus brace – a novel orthotic device
A super-elastic alloy hallux valgus brace – a novel orthotic device Open
Objective: Evaluate the efficacy of a new orthotic-made super-elastic alloy brace to correct hallux valgus (HV) deformity.Methods: Five female patients diagnosed with HV deformity wore the newly developed orthotic daily for six weeks. The …
View article: An efficient experimental approach for high-throughput discovery of novel Ti-based shape-memory alloys
An efficient experimental approach for high-throughput discovery of novel Ti-based shape-memory alloys Open
β-Ti shape-memory alloys, that show shape-memory effect or superelasticity owing to thermoelastic martensitic transformation, have potential for various applications. Herein, we propose an experimental approach for the efficient and high-t…
View article: Magnetic properties, phase diagram and low-temperature specific heat of Ni50Mn50-xSbx alloys
Magnetic properties, phase diagram and low-temperature specific heat of Ni50Mn50-xSbx alloys Open
This study examines the magnetic properties and temperature-composition phase diagram of the Ni50Mn50-xSbx alloys. The addition of Sb into the antiferromagnetic Ni50Mn50 alloy introduces ferromagnetic interaction, resulting in a sudden dec…
View article: Experimental Determination of Phase Equilibria in the Mn-Zn Binary System
Experimental Determination of Phase Equilibria in the Mn-Zn Binary System Open
Phase equilibria in the Mn-Zn binary system were experimentally determined by chemical composition examination, crystal structure determination, and thermal analysis. Major changes were detected for the β , ε , and δ phases. The β -B2 sing…
View article: Relationship between Hydrogen Pressure and Temperature for Recombination Reactions in the HDDR Processing of Ce–Fe–B Alloys
Relationship between Hydrogen Pressure and Temperature for Recombination Reactions in the HDDR Processing of Ce–Fe–B Alloys Open
In recent years, to reduce manufacturing costs and alleviate the rare-earth supply/demand imbalance in the Nd–Fe–B magnet market, researchers have actively pursued the development of (Nd,Ce)–Fe–B magnets, in which Nd is replaced by Ce. In …
View article: Pd<sub>2</sub>MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss
Pd<sub>2</sub>MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss Open
Metamagnetic shape memory alloys (MMSMAs) are attractive functional materials owing to their unique properties such as magnetostrain, magnetoresistance, and the magnetocaloric effect caused by magnetic‐field‐induced transitions. However, t…
View article: Recrystallization Behavior of IF Steel at the Interface of Aluminum Junction
Recrystallization Behavior of IF Steel at the Interface of Aluminum Junction Open
Two cold-rolled IF steel sheets sandwiching an aluminum sheet were heat-treated at 650°C, and the recrystallization behavior in the interfacial region between the IF steel and pure aluminum was observed and analyzed. The tongue-like struct…
View article: Flexible and Tough Superelastic Co–Cr Alloys for Biomedical Applications
Flexible and Tough Superelastic Co–Cr Alloys for Biomedical Applications Open
The demand for biomaterials has been increasing along with the increase in the population of elderly people worldwide. The mechanical properties and high wear resistance of metallic biomaterials make them well‐suited for use as substitutes…
View article: Demonstration of Principle of Low-temperature Thermal Power Generation Using Combination of Magnetic Phase Transformation Alloy and Magnetostrictive Vibrational Power Generator
Demonstration of Principle of Low-temperature Thermal Power Generation Using Combination of Magnetic Phase Transformation Alloy and Magnetostrictive Vibrational Power Generator Open
Ni-Co-Mn-Sn metamagnetic shape memory alloys are known to show drastic change of magnetization upon martensitic transformation. For a selected composition, a steep magnetization change occurs slightly above room temperature. In this paper,…
View article: Atomic Order Along the Half‐ to Full‐Heusler Transition in Ni<sub>1+<i>x</i></sub>MnSb
Atomic Order Along the Half‐ to Full‐Heusler Transition in Ni<sub>1+<i>x</i></sub>MnSb Open
Structural voids are a defining feature of the half‐Heusler structure. Using temperature‐dependent neutron diffraction, complemented by room‐temperature X‐ray diffraction and high‐resolution neutron diffraction as well as calorimetry and m…
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: Soft X-ray absorption spectroscopy and magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy
Soft X-ray absorption spectroscopy and magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy Open
In this study, X-ray absorption spectroscopy (XAS) experiments for Ni45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under high magnetic fields up to 12 T using a pulsed magnet. Field-induced reverse transformation to aust…
View article: X-ray magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy.
X-ray magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy. Open
In this study, X-ray absorption spectroscopy (XAS) experiments for Ni45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under high magnetic fields up to 12 T using a pulsed magnet. Field-induced reverse transformation to aust…
View article: Recrystallization behaviour of IF steel at the interface of Al junction
Recrystallization behaviour of IF steel at the interface of Al junction Open
The recrystallization behavior of an IF steel was investigated at the interface with aluminum junction, using cold-rolled IF steel sheets with high recrystallization temperature. In the region surrounded by the tongue-like η phase, recryst…