PartagerUn nouvel alliage métallique pour le froid magnétique ? (en anglais)
Un nouvel alliage de métal sans terres rares pourrait conduire à des systèmes de froid magnétique commercialement viables. (en anglais)
A new metal alloy which does not use rare-earth elements could lead to commercially viable magnetic refrigeration systems.
Researchers at the Rochester Institute of Technology have studied a promising new metal alloy that could be used as a magnetocaloric material for magnetic cooling. This study, published in Scientific Reports, led to an iron-based high entropy alloy as a component of next-generation magnetic refrigeration.
The alloy is a cheaper, more eco-friendly and readily available alternative to metals made from expensive rare-earth elements. The NiFeCoCrPdx family is said to exhibit a second order magnetic phase transition whose critical temperature is tunable from 100K to well above room temperature. A near 40% enhancement of the refrigerating capacity is said to be achievable.
Though rare-earth materials tend to exhibit higher entropy changes, they can suffer from cracking and fatigue, which severely limits their useful lifetime. The so-called high entropy alloys (HEAs) are a class of emergent transition metal alloys that hold great potential for advanced manufacturing, and which may impact magnetocalorics. They are said to offer supply chain and cost stability, as well as superior mechanical properties such as ductility, corrosion resistance, machinability, all of which ease manufacturing and bolster product longevity.
Fe1Co1Ni1Cr1Pdx is an example of an HEA system with tunable magnetic properties.
Researchers at the Rochester Institute of Technology have studied a promising new metal alloy that could be used as a magnetocaloric material for magnetic cooling. This study, published in Scientific Reports, led to an iron-based high entropy alloy as a component of next-generation magnetic refrigeration.
The alloy is a cheaper, more eco-friendly and readily available alternative to metals made from expensive rare-earth elements. The NiFeCoCrPdx family is said to exhibit a second order magnetic phase transition whose critical temperature is tunable from 100K to well above room temperature. A near 40% enhancement of the refrigerating capacity is said to be achievable.
Though rare-earth materials tend to exhibit higher entropy changes, they can suffer from cracking and fatigue, which severely limits their useful lifetime. The so-called high entropy alloys (HEAs) are a class of emergent transition metal alloys that hold great potential for advanced manufacturing, and which may impact magnetocalorics. They are said to offer supply chain and cost stability, as well as superior mechanical properties such as ductility, corrosion resistance, machinability, all of which ease manufacturing and bolster product longevity.
Fe1Co1Ni1Cr1Pdx is an example of an HEA system with tunable magnetic properties.