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AssigneeIowa State University Research Foundation, Inc.
InventorsHenrique Neves Bez, Anis Biswas, Arjun K. Pathak, Yaroslav Mudryk, Nikolai A. Zarkevich, Viktor Balema, Vitalij K Pecharsky
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A method is provided of making a magnetocaloric alloy composition comprising Ni, Co, Mn, and Ti, which preferably includes certain beneficial substitutional elements, by melting the composition and rapidly solidifying the melted composition at a cooling rate of at least 100 K/second (Kelvin/second) to improve a magnetocaloric property of the composition. The rapidly solidified composition can be heat treated to homogenize the composition and annealed to tune the magneto-structural transition for use in a regenerator.
A method of making a magnetocaloric alloy composition comprising Ni, Co, Mn, and Ti alloy represented by Ni50-xCoxMn35Ti15 where x=10 to 15 comprising melting the alloy to provide an alloy melt and rapidly solidifying the alloy melt at a cooling rate of at least 100 K/second (Kelvin/second) to yield a rapidly solidified alloy having a B2 crystal structure and exhibiting a magneto-structural transition between a ferromagnetic phase and an antiferromagnetic phase that produces, as-rapidly solidified, a magnetocaloric entropy change at about room temperature in a magnetic field of 1.5 T to 2 T that is greater than that of a same alloy that is not rapidly solidified.
Dependencies are inferred from the claim text.