US 11,725,263 B2
High temperature oxidation resistant co-based gamma/gamma prime alloys DMREF-Co
Tresa M. Pollock, Santa Barbara, CA (US); Colin A. Stewart, Goleta, CA (US); Sean P. Murray, Goleta, CA (US); and Carlos G. Levi, Santa Barbara, CA (US)
Assigned to THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, Oakland, CA (US)
Filed by The Regents of the University of California, Oakland, CA (US)
Filed on Apr. 4, 2019, as Appl. No. 16/375,687.
Claims priority of provisional application 62/652,614, filed on Apr. 4, 2018.
Prior Publication US 2020/0140978 A1, May 7, 2020
Int. Cl. C22C 30/00 (2006.01); C22F 1/10 (2006.01); F01D 5/28 (2006.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01)
CPC C22C 30/00 (2013.01) [C22F 1/10 (2013.01); F01D 5/28 (2013.01); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); F05D 2220/32 (2013.01); F05D 2300/175 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A composition of matter, comprising:
an alloy of Co, Ni, Al, Ta, and Cr, wherein:
the alloy comprises a solid solution of gamma and gamma prime alloy phases,
the Ni content is at least 25% at. %,
the Al content is at least 10 at. %,
the Cr content is at least 2 at. %,
the Ni:Co ratio is between 0.5 and 1.5, and
further comprising:
a W content in a range of 0 to 2 at. %, and
the Ta content in a range of 2.5-5 at. %, wherein:
the alloy is able to generate a protective aluminum oxide layer upon exposure to air, and
the alloy is characterized by having a γ′ solvus greater than 1100° C. and a solidus of 1343° C. or less.