Exploitation of deformation mechanisms for industrial usage in thin product forms
View Patent ↗The present disclosure relates to a glass forming alloy. The glass forming alloy may include 43.0 atomic percent to 68.0 atomic percent iron, 10.0 atomic percent to 19.0 atomic percent boron, 13.0 atomic percent to 17.0 atomic percent nickel, 2.5 atomic percent to 21.0 atomic percent cobalt, optionally 0.1 atomic percent to 6.0 atomic percent carbon, and optionally 0.3 atomic percent to 3.5 atomic percent silicon. Furthermore, the glass forming alloy includes between 5% to 95% by volume one or more spinodal glass matrix microconstituents which include one or more semi-crystalline or crystalline phases at a length scale less than 50 nm in a glass matrix. In addition, the glass forming alloy is capable of blunting shear bands through localized deformation induced changes under tension.
1. A method of forming spinodal microconstituents in a glass forming alloy comprising:
melting alloy constituents consisting of 43.0 atomic percent to 68.0 atomic percent iron, 10.0 atomic percent to 19.0 atomic percent boron, 13.0 atomic percent to 17.0 atomic percent nickel, 2.5 atomic percent to 21.0 atomic percent cobalt, optionally one or more of the following 0.1 atomic percent to 6.0 atomic percent carbon, 0.3 atomic percent to 3.5 atomic percent silicon, 1 atomic percent to 8 atomic percent titanium, 1 atomic percent to 8 atomic percent molybdenum, 1 atomic percent to 8 atomic percent copper, 1 atomic percent to 8 atomic percent cerium, and 2 atomic percent to 16 atomic percent aluminum to form an alloy having a critical cooling rate for metallic glass formation of <100,000 K/s; and
forming and cooling said alloy, at a rate of 10 2 K/s to 10 6 K/s wherein upon cooling the glass forming alloy includes between 5% to 95% by volume spinodal microconstituents comprising one or more semi-crystalline or crystalline phases at a length scale less than 50 nm in a glass matrix effectively blunting shear bands through localized deformation induced changes under tension and wherein said alloy exhibits a tensile elongation of greater than 1% and up to 7%.
2. The method of claim 1 , wherein said alloy constituents consist of 43.0 atomic percent to 68.0 atomic percent iron, 12.0 atomic percent to 19.0 atomic percent boron, 15.0 atomic percent to 17.0 atomic percent nickel, 2.5 atomic percent to 21.0 atomic percent cobalt, optionally 0.1 atomic percent to 6.0 atomic percent carbon, and optionally 0.4 atomic percent to 3.5 atomic percent silicon.
3. The method of claim 1 , wherein said alloy constituents consist of 52.0 atomic percent to 63.0 atomic percent iron, 10.0 atomic percent to 13.0 atomic percent boron, 13.0 atomic percent to 17.0 atomic percent nickel, 2.5 atomic percent to 3.0 atomic percent cobalt, 0.1 atomic percent to 5.0 atomic percent carbon, 0.3 atomic percent to 0.5 atomic percent silicon, and one or more of the following: 1 atomic percent to 8 atomic percent titanium, 1 atomic percent to 8 atomic percent molybdenum, 1 atomic percent to 8 atomic percent copper, 1 atomic percent to 8 atomic percent cerium, and 2 atomic percent to 16 atomic percent aluminum.
4. The method of claim 1 wherein said alloy exhibits a thickness of 2000 μm or less.
5. The method of claim 1 wherein said alloy exhibits a thickness of 250 μm or less.
6. The method of claim 1 wherein said alloy is formed into sheet, foil, ribbon, fiber, powder, or wire upon cooling.
7. The method of claim 1 wherein said alloy is at least formed and cooled in a process including the Taylor-Ulitovsky wire making process, chill block melt-spinning process, planar flow casting process, and twin roll casting.