BULK NICKEL-PHOSPHORUS-BORON GLASSES BEARING CHROMIUM AND TANTALUM

• US 20140130945A1
• Filed: 11/15/2013
• Published: 05/15/2014
• Est. Priority Date: 11/15/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Glassimetal Technology Inc.
• Inventors: Na, Jong Hyun, Floyd, Michael, Demetriou, Marios D., Johnson, William L., Garrett, Glenn
• Granted Patent: US 9,556,504 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 bulk-glass forming Ni—Cr—Nb—P—B alloy is provided. The alloy includes Ni_{(100−a−b−c−d)}Cr_aTa_bP_cB_d, where the atomic percent a is between 3 and 11, the atomic percent b is between 1.75 and 4, the atomic percent c is between 14 and 17.5, and the atomic percent d is between 2.5 and 5. The alloy is capable of forming a metallic glass having a lateral dimension of at least 3 mm.

Claims

1. An alloy comprising Ni₍₁₀₀₋

a−

b−

c−

d)Cr_aTa_bP_cB_d wherein the atomic percent a is between 3 and 11, the atomic percent b is between 1.75 and 4, the atomic percent c is between 14 and 17.5, the atomic percent d is between 2.5 and 5, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 3 mm.

2. The alloy of claim 1, wherein b is determined by x+y·

a, and wherein x is between 1.5 and 2 and y is between 0.1 and 0.15.

3. The alloy of claim 2, wherein x is between 1.85 and 1.9, y is between 0.12 and 0.13, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

4. The alloy of claim 1 wherein a is between 6 and 8, b is between 2.5 and 3, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

5. The alloy of claim 1, wherein a is between 8 and 10.5, b is between 2.75 and 3.25, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

6. The alloy of claim 1, wherein a+b is less than 10, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

7. The alloy of claim 1, wherein c is between 16 and 17, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

8. The alloy of claim 1, wherein d is between 3 and 4, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

9. The alloy of claim 1, wherein up to 1 atomic percent of P is substituted by Si.

10. 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.

11. The alloy of claim 1, wherein up to 10 atomic percent of Ni is substituted by Fe, Co, Cu, Pd, Pt, or combinations thereof.

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

13. The alloy of claim 1, wherein the alloy comprises Ni_80.5−

a−

bCr_aTa_bP_16.25B_3.25, wherein the atomic percent a is between 3 and 11, b is determined by x+y·

a, wherein x is between 1.5 and 2, y is between 0.1 and 0.15, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 3 mm.

14. The alloy of claim 12, wherein x is between 1.85 and 1.9, y is between 0.12 and 0.13, and wherein the alloy is capable of forming a metallic glass having a lateral dimension of at least 5 mm.

16. A metallic glass comprising any of the alloys of claim 1.

17. The metallic glass of claim 16, wherein the stress intensity factor at crack initiation of the metallic glass 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 is at least 40 MPa m^1/2.

18. The metallic glass of claim 16, wherein a wire made of the metallic glass having a diameter of 1 mm can undergo macroscopic plastic deformation under bending load without fracturing catastrophically.

15. An alloy comprising a composition selected from a group consisting of Ni_68.5Cr₉Ta₃P_16.5B₃, Ni_68.5Cr₉Ta₃P_16.25B_3.25, Ni_68.5Cr₉Ta₃P₁₆B_3.5, Ni_69.5Cr₈Ta₃P_16.25B_3.25, Ni_67.5Cr₁₀Ta₃P_16.25B_3.25, Ni_68.08Cr_8.94Ta_2.98P_16.67B_3.33, Ni_71.31Cr_6.5Ta_2.69P_16.25B_3.25, Ni_70.75Cr₇Ta_2.75P_16.25B_3.25, Ni_70.19Cr_7.5Ta_2.81P_16.25B_3.25, Ni_67.94Cr_9.5Ta_3.06P_16.25B_3.25, Ni_70.25Cr₇Ta_3.25P_16.25B_3.25, Ni₇₁Cr₇Ta_2.5P_16.25B_3.25, Ni_69.75Cr₈Ta_2.75P_16.25B_3.25, Ni_68.5Cr₉Ta₃P_15.75B_3.25Si_0.5, and Ni_68.5Cr₉Ta₃P_15.25B_3.25Si₁.

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

melting an alloy comprising at least Ni, Cr, Ta, P, and B with a formula Ni<sub>(100−

a−

b−

c−

d)</sub>Cr_aTa_bP_cB_d wherein an atomic percent a is between 3 and 11, an atomic percent b is between 1.75 and 4, an atomic percent c is between 14 and 17.5, an atomic percent d is between 2.5 and 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 alloy is capable of forming a metallic glass having a lateral dimension of at least 3 mm.

20. The method of claim 19, wherein the temperature of the melt prior to quenching is at least 100°

C. above the liquidus temperature of the alloy.