Nanostructured Mn-Al Permanent Magnets And Method of Producing Same
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Mar 20, 2012
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Jul 2, 2010
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A bulky consolidated nanostructured manganese aluminum alloy includes at least about 80% of a magnetic τ phase and having a macroscopic composition of MnXAlYDoZ, where Do is a dopant, X ranges from 52-58 atomic percent, Y ranges from 42-48 atomic percent, and Z ranges from 0 to 3 atomic percent. A method for producing a bulky nanocrystalline solid of formula MnxAlyDoz is provided. The method includes melting a mixture of metals to form a substantially homogenous solution, casting the solution to form ingots, measuring compositions of the ingots; crushing the ingots to form crushed powders, and milling the crushed powders to form nanocrystalline powders. The method further includes verifying the presence of τ phase and determining the amount of the τ phase, and simultaneously consolidating the nanocrystalline powders into a bulky nanocrystalline solid and undergoing phase transformation from ε phase to at least 80% τ phase.
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