Nanostructured Mn-Al permanent magnets and methods of producing same
AssigneeTrustees of Dartmouth College
InventorIan Baker
Life of this patent
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Abstract
Nanostructured Mn—Al, Mn—Al—C permanent magnets are disclosed. The magnets have high coercivities (about 4.8 kOe and 5.2 kOe) and high magnetization values. An intennetallic composition includes a ternary transition metal modified manganese aluminum alloy Mn—Al—Fe, Mn—Al—Ni, or Mn—Al—Co having at least about 80% of a magnetic τ phase and permanent magnetic properties. The alloy may have a saturation magnetization value of at least 96 emu/g with approximately 5% ternary transition metal replacing Al. The alloy may also have a saturation magnetization value of at least 105 emu/g with 10% ternary transition metal replacing Al.
Claims6
An intermetallic composition comprising a ternary transition metal modified manganese aluminum alloy comprising a bulk nanostructured alloy with at least about 80% of a magnetic τ phase and having permanent magnetic properties,
- the bulk alloy having a macroscopic composition of MnXAlYTZ, wherein
- T is a ternary transition metal selected from a group consisting of iron, cobalt and nickel,
- X ranges from 50 atomic % to 60 atomic %,
- X +Y +Z =100 atomic %, and
- Z is an amount less than 10 atomic % sufficient to impart a saturation magnetization of at least 96 emu/g and the τ phase comprises Mn, Al and a ternary transition metal selected from the group consisting of iron, cobalt and nickel.
Dependencies are inferred from the claim text.