Bulk solidifying amorphous alloys with improved mechanical properties
AssigneeCrucible Intellectual Property, LLC
InventorsWilliam Johnson, Jan Schroers
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Abstract
Bulk solidifying amorphous alloys exhibiting improved processing and mechanical properties and methods of forming these alloys are provided. The bulk solidifying amorphous alloys are composed to have high Poisson's ratio values. Exemplary Pt-based bulk solidifying amorphous alloys having such high Poisson's ratio values are also described. The Pt-based alloys are based on Pt—Ni—Co—Cu—P alloys, and the mechanical properties of one exemplary alloy having a composition of substantially Pt57.5Cu14.7Ni5.3P22.5 are also described.
Claims25
A bulk-solidifying amorphous alloy having the following composition:
- (Pt,Pd)xMyPz
- wherein M is a combination of at least Cu and Ni, having a ratio of Cu to Ni of from about 1 to 4, x is from about 20 to 60 atomic percent, y is from 15 to 60 atomic percent and z is from about 16 to 24 atomic percent, and wherein Pd is optionally included in the alloy;
- wherein the combination of components has a Poisson's ratio of at least 0.38;
- and
- wherein, the alloy exhibiting an elastic strain limit of at least 1.5%, a ductility of more than 10% under compression geometries with aspect ratio more than 2, a bend ductility of more than 3% under bending geometries with a thickness more than 2.0 mm, and a fracture toughness greater than K1C>35 MPa m−1/2.
A bulk solidifying amorphous alloy, wherein the bulk solidifying amorphous alloy has a composition according to the formula:
- ((Pt,Pd)1-xPGMx)a((Cu,Co,Ni)1-yTMy)b((P,Si)1-zXz)c
- where a is in the range of from about 20 to 65 atomic percent, b is in the range of from about 15 to 60 atomic percent, c is in the range of from about 16 to 24 atomic percent;
- where the concentration of Pt is at least 10 atomic percent;
- where Co is in non-zero concentration and the total combine concentration of Ni and Co is at least 2 atomic percent;
- where the concentration of P is at least 10 atomic percent;
- where PGM is selected from the group consisting of Ir, Os, Au, W, Ru, Rh, Ta, Nb and Mo;
- where TM is selected from the group consisting of Fe, Zn, Ag, Mn and V;
- where X is selected from the group consisting of B, Al, Ga, Ge, Sn, Sb and As;
- where x, y and z are atomic fractions, wherein:
- z is less than about 0.3,
- the sum of x, y and z is less than about 0.5,
- when a is less than 35, x is less than about 0.3 and y is less than about 0.1,
- when a is in the range of from about 35 to 50, x is less than about 0.2 and y is less than about 0.2, and
- when a is more than 50, x is less than about 0.1 and y is less than about 0.3;
- and
- wherein the combination of components has a Poisson's ratio of at least 0.38.
Dependencies are inferred from the claim text.