Alloy with metallic glass and quasi-crystalline properties
First Claim
1. An alloy exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature.
2 Assignments
0 Petitions
Accused Products
Abstract
An alloy is described that is capable of forming a metallic glass at moderate cooling rates and exhibits large plastic flow at ambient temperature. Preferably, the alloy has a composition of (Zr, Hf)a TabTicCudNieAlf, where the composition ranges (in atomic percent) are 45≦a≦70, 3≦b≦7.5, 0≦c≦4, 3≦b+c≦10, 10≦d≦30, 0≦e≦20, 10≦d+e≦35, and 5≦f≦15. The alloy may be cast into a bulk solid with disordered atomic-scale structure, i.e., a metallic glass, by a variety of techniques including copper mold die casting and planar flow casting. The as-cast amorphous solid has good ductility while retaining all of the characteristic features of known metallic glasses, including a distinct glass transition, a supercooled liquid region, and an absence of long-range atomic order. The alloy may be used to form a composite structure including quasi-crystals embedded in an amorphous matrix. Such a composite quasi-crystalline structure has much higher mechanical strength than a crystalline structure.
-
Citations
27 Claims
- 1. An alloy exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature.
- 9. A metallic glass having a thickness of at least one millimeter in its smallest dimension and exhibiting a plastic stain to failure in compression of greater than 1.5 percent and up to about 7 percent at room temperature.
-
16. A method of forming a metallic glass exhibiting a plastic strain to failure in compression of more than about 1.5 percent at room temperature, the method comprising:
-
providing an alloy having a composition of (Zr, Hf)a TabTicCudNieAlf, wherein the composition ranges in atomic percent are 45≦
a≦
70, 3≦
b≦
7.5, 0≦
c≦
4, 3≦
b+c≦
10, 10≦
d≦
30, 0≦
e≦
20, 10≦
d+e≦
35, and 5≦
f≦
15;
casting the alloy into an amorphous solid;
annealing the solid; and
cooling the solid at a rate of between about 1 K/s and about 1000 K/s.
-
-
22. A method of forming a metallic glass exhibiting a plastic strain to failure in compression of more than about 1.5 percent at ambient temperature, the method comprising:
-
providing an alloy having a composition of ZraTabTicCudNieAlf, wherein the composition ranges in atomic percent are 45≦
a≦
70, 2≦
b≦
7, 2≦
c≦
7, 4≦
b+c≦
25, 10≦
d≦
25, 5≦
e≦
15, and 5≦
f≦
15;
casting the alloy into an amorphous solid;
annealing the solid; and
cooling the solid at a rate of between about 1 K/s and about 1000 K/s. - View Dependent Claims (23, 24, 25, 26, 27)
-
Specification