BULK NICKEL-BASED CHROMIUM AND PHOSPHORUS BEARING METALLIC GLASSES WITH HIGH TOUGHNESS

• US 20140116579A1
• Filed: 10/30/2013
• Published: 05/01/2014
• Est. Priority Date: 10/30/2012
• Status: Active Grant

• Current Assignee: Glassimetal Technology Inc.
• Original Assignee: Glassimetal Technology Inc.
• Inventors: Na, Jong Hyun, Floyd, Michael, Demetriou, Marios D., Johnson, William L., Garrett, Glenn, Launey, Maximilien
• Granted Patent: US 9,863,024 B2
• Time in Patent Office: Days
• US Class Current: 148/555
• CPC Class Codes: C22C 1/11 Making amorphous alloys
• CPC Class Codes: C22C 19/05 with chromium
• CPC Class Codes: C22C 19/058 without Mo and W
• CPC Class Codes: C22C 45/04 with nickel or cobalt as the major constituent

Abstract

A Ni-based bulk metallic glass forming alloy is provided. The alloy includes Ni_{(100-a-b-c-d)}Cr_aNb_bP_cB_d, where an atomic percent of chromium (Cr) a ranges from 3 to 13, an atomic percent of niobium (Nb) b is determined by x−y*a, where x ranges from 3.8 to 4.2 and y ranges from 0.11 to 0.14, an atomic percent of phosphorus (P) c ranges from 16.25 to 17, an atomic percent of boron (B) d ranges from 2.75 to 3.5, and the balance is nickel (Ni), and where the alloy is capable of forming a metallic glass object having a lateral dimension of at least 6 mm, where the metallic glass has a stress intensity factor at crack initiation when measured on a 3 mm diameter rod containing a notch with length between 1 and 2 mm and root radius between 0.1 and 0.15 mm, the stress intensity factor being at least 70 MPa m^1/2.

Claims

1. An alloy, the alloy comprising:

Ni_{(100-a-b-c-d)}Cr_aNb_bP_cB_d

wherein an atomic percent of chromium (Cr) a ranges from 3 to 13, an atomic percent of niobium (Nb) b is determined by x−

y*a, wherein x ranges from 3.8 to 4.2 and y ranges from 0.11 to 0.14, an atomic percent of phosphorus (P) c ranges from 16.25 to 17, an atomic percent of boron (B) d ranges from 2.75 to 3.5, and the balance is nickel (Ni), and wherein the alloy is capable of forming a metallic glass object having a lateral dimension of at least 6 mm, wherein the metallic glass has a stress intensity factor at crack initiation when measured on a 3 mm diameter rod containing a notch with length between 1 and 2 mm and root radius between 0.1 and 0.15 mm, the stress intensity factor being at least 70 MPa m^1/2.

2. The alloy of claim 1, wherein an atomic percent of chromium (Cr) a ranges from 3.5 to 12.5.

3. The alloy of claim 1, wherein the alloy comprises Ni_{77.4375-0.875a}Cr_aNb_{4.0625-0.125a}P_16.5B₃, and the atomic percent of Cr a is between 3 and 13.

4. The alloy of claim 3, wherein the alloy comprises Ni_{77.4375-0.875a}Cr_aNb_{4.0625-0.125a}P_16.5B₃, and the atomic percent of Cr a is between 4 and 13.

5. The alloy of claim 1, wherein the atomic percent of Cr ranges from 4 to 9, and the alloy is capable of forming a metallic glass object having a lateral dimension of at least 9 mm.

6. The alloy of claim 1, wherein up to 1 atomic percent of P is substituted by silicon (Si).

7. The alloy of claim 1, wherein up to 2 atomic percent of Cr is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, or combinations thereof.

8. The alloy of claim 1, wherein up to 2 atomic percent of Ni is substituted by Fe, Co, Mn, W, Mo, Ru, Re, Cu, Pd, Pt, or combinations thereof.

9. The alloy of claim 1, wherein up to 1.5 atomic % of Nb is substituted by Ta, V, or combinations thereof.

10. The alloy of claim 1, wherein the alloy comprises composition Ni_71.4Cr_5.52Nb_3.38P_16.67B_3.03 that is capable of forming a metallic glass bulk object having a lateral dimension of at least 10 mm.

11. A metallic glass comprising the alloy of claim 1.

12. An alloy comprising compositions selected from a group consisting of Ni_73.375Cr_3.5Nb_3.625P_16.5B₃, Ni_72.5Cr_4.5Nb_3.5P_16.5B₃, Ni_71.5Cr_5.64Nb_3.36P_16.5B₃, Ni_71.4Cr_5.64Nb_3.46P_16.5B₃, Ni_71.4Cr_5.52Nb_3.38P_16.67B_3.03, N_71.4Cr_5.52Nb_3.38P_16.17B_3.03Si_0.5, Ni_70.5Cr_6.78Nb_3.22P_16.5B₃, Ni_68.5Cr₉Nb₃P_16.5B₃, Ni_67.25Cr_10.5Nb_2.75P_16.5B₃, and Ni_65.5Cr_12.5Nb_2.5P_16.5B₃.

13. A method for processing an alloy to form a metallic glass, the method comprising:

melting an alloy comprising at least Ni, Cr, Nb, P, and B with a formula Ni_{(100-a-b-c-d)}Cr_aNb_bP_cB_d wherein an atomic percent of chromium (Cr) a ranges from 3 to 13, an atomic percent of niobium (Nb) b is determined by x−

y*a, wherein x ranges from 3.8 to 4.2 and y ranges from 0.11 to 0.14, an atomic percent of phosphorus (P) c ranges from 16.25 to 17, an atomic percent of boron (B) d ranges from 2.75 to 3.5, and the balance is nickel (Ni), into a molten state; and

quenching the molten alloy at a cooling rate sufficiently rapid to prevent crystallization of the alloy to form the metallic glass, wherein the metallic glass has a stress intensity factor at crack initiation when measured on a 3 mm diameter rod containing a notch with length ranging from 1 to 2 mm and root radius ranging from 0.1 to 0.15 mm, the stress intensity factor being at least 70 MPa m^1/2.

14. The method of claim 13, further comprising fluxing the molten alloy prior to quenching by using a reducing agent.

15. The method of claim 13, the step of melting the alloy comprising melting the alloy at a temperature of at least 100°

C. above the liquidus temperature of the alloy.

16. The method of claim 13, the step of melting the alloy comprising melting the alloy at a temperature of at least 1100°

C.

17. The method of claim 13, wherein the alloy is selected from a group consisting of compositions Ni_73.375Cr_3.5Nb_3.625P_16.5B₃, Ni_72.5Cr_4.5Nb_3.5P_16.5B₃, Ni_71.5Cr_5.64Nb_3.36P_16.5B₃, Ni_71.4Cr_5.64Nb_3.46P_16.5B₃, Ni_71.4Cr_5.52Nb_3.38P_16.67B_3.03, Ni_71.4Cr_5.52Nb_3.38P_16.17B_3.03Si_0.5, Ni_70.5Cr_6.78Nb_3.22P_16.5B₃, Ni_68.5Cr₉Nb₃P_16.5B₃, Ni_67.25Cr_10.5Nb_2.75P_16.5B₃, and Ni_65.5Cr_12.5Nb_2.5P_16.5B₃.

18. The method of claim 13, wherein the alloy is capable of forming a metallic glass object having a lateral dimension of at least 6 mm.

19. The method of claim 13, wherein the alloy comprises Ni_{77.4375-0.875a}Cr_aNb_{4.0625-0.125a}P_16.5B₃, and atomic percent of Cr ranges from 3 to 13.

20. The method of claim 13, wherein the alloy comprises Ni_71.4Cr_5.52Nb_3.38P_16.67B_3.03 and is capable of forming a metallic glass object having a lateral dimension of at least 10 mm.