LOW OXYGEN CONTENT, CRACK-FREE HEUSLER AND HEUSLER-LIKE ALLOYS & DEPOSITION SOURCES & METHODS OF MAKING SAME
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United States of America Patent
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Issued Date -
Jul 24, 2008
app pub date -
Jan 17, 2008
filing date -
Jan 19, 2007
priority date (Note) -
Abandoned
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Abstract
A method of forming Heusler or Heusler-like alloys of formula X.sub.2YZ or XYZ comprises providing a crucible comprised of at least one metal oxide material thermodynamically stable to molten transition metals; supplying predetermined amounts of constituent elements or master alloy materials of the alloy to the crucible; and melting the constituent elements or master alloy materials under vacuum or a partial pressure of an inert gas to form alloys containing less than about 50 ppm oxygen. Crack-free alloys are formed by casting the alloys in a mold utilizing a multi-stage stress-relieving, heat-assisted casting process. Also disclosed are crack-free Heusler and Heusler-like alloys of formula X.sub.2YZ or XYZ containing less than about 50 ppm oxygen and deposition sources, e.g., sputtering targets, fabricated therefrom.
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