United States of America As Represented by the Administrator of Nasa

Timothy M Smith

Robert W Carter

Christopher A Kantzos

Michael J Kulis

An additive manufacturing powdered composite material includes metal particles coated with a coating of ceramic particles. The metal particles may include a ternary NiCoCr alloy, with select additions of minor amounts of other elements. The ceramic particles may include yttrium oxide or other oxides. The composite material is suitable for additive manufacturing (AM) into a component for high temperature (>1000° C.) applications. The AM component includes a metal matrix formed from the alloy, with the ceramic particles dispersed in the matrix.

Additively manufactured oxide dispersion strengthened medium entropy alloys for high temperature applications

A local phase transformation strengthened nickel-base superalloy includes at least 8.0 wt % eta phase formers; at least 7.0 wt % of chi phase formers; less than 12 wt % chromium; at least 18 wt % cobalt; and aluminum. A ratio of eta phase formers:aluminum is (3.2-3.4):1. The eta phase formers can include titanium, tantalum, hafnium, and niobium. The chi phase formers include tungsten and molybdenum. When the superalloy is subjected to elevated temperatures, these levels of components promote eta and chi phase formation along superlattice stacking faults, thereby resulting in a local phase transformation at the stacking faults, which strengthens the superalloy and inhibits creep deformation.

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Cleveland, OH, United States of America

Timothy M Smith