Laser fabrication of discontinuously reinforced metal matrix composites
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United States of America Patent
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Apr 21, 2009
Grant Date -
Jan 16, 2003
app pub date -
May 16, 2002
filing date -
Nov 16, 1999
priority date (Note) -
Expired
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Abstract
Disclosed are reinforced metal matrix composites and methods of shaping powder materials to form such composites. Articles of manufacture are formed in layers by a laser fabrication process. In the process, powder is melted and cooled to form successive layers of a discontinuously reinforced metal matrix. The matrix exhibits fine grain structure with enhanced properties over the unreinforced metal, including higher tensile modulus, higher strength, and greater hardness. In some preferred embodiments, an in-situ alloy powder, a powder metallurgy blend, or independently provided powders are reinforced with boron and/or carbon to form the composite.
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