|
1. A powder composition for additive manufacturing or welding, wherein said powder composition comprises metal-containing microparticles and from about 0.01 vol % to about 3 vol % nanoparticles, wherein said nanoparticles are selected from metals, intermetallic alloys, or hydrides thereof, wherein said nanoparticles are compositionally different than said microparticles, wherein said nanoparticles are smaller than said microparticles in at least one dimension, wherein said nanoparticles are characterized by a largest dimension from about 50 nanometers to about 5000 nanometers, wherein said nanoparticles are chemically bonded onto surfaces of said microparticles to form a continuous coating or an intermittent coating, wherein at least 10% of total surface area of said microparticles is covered by said nanoparticles, wherein said microparticles comprise (i) nickel and (ii) aluminum and/or titanium, wherein the sum of aluminum weight percentage and one-half of titanium weight percentage is at least 3 on a nanoparticle-free basis, and wherein said powder composition contains, on a nanoparticle-free basis, about 40 wt % to about 80 wt % Ni, 0 to about 10 wt % Al, and 0 to about 10 wt % Ti.
|
