BULK NICKEL-PHOSPHORUS-BORON GLASSES BEARING MOLYBDENUM

• US 20140096873A1
• Filed: 10/08/2013
• Published: 04/10/2014
• Est. Priority Date: 10/08/2012
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Glassimetal Technology Inc.
• Inventors: Na, Jong Hyun, Floyd, Michael, Garrett, Glenn, Demetriou, Marios D., Johnson, William L.
• Application Number:
  US14/048,894
• Publication Number:
  US 20140096873A1
• Time in Patent Office: Days
• US Class Current: 148/555
• CPC Class Codes: C22C 1/11 Making amorphous alloys
• CPC Class Codes: C22C 19/03 based on nickel
• CPC Class Codes: C22C 45/04 with nickel or cobalt as the major constituent

Abstract

The disclosure provides Ni—Mo—P—B, Ni—Mo—Nb—P—B, and Ni—Mo—Nb—Mn—P—B alloys capable of forming metallic glass objects. The metallic glass objects can have lateral dimensions in excess of 1 mm and as large as 3 mm or larger. The disclosure also provides methods for forming the metallic glasses.

Claims

1. An alloy comprising:

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

wherein subscripts a, b, c, and d, denote atomic percents for Mo, Nb, P, and B, respectively, wherein a is between 2 and 12, b is up to 8, c is between 14 and 19, d is between 1 and 4, and the balance is nickel (Ni), and wherein the alloy is capable of forming an object comprising a metallic glass.

2. The alloy of claim 1, wherein a combined atomic percent of Mo and niobium is between 7 and 9.

3. The alloy of claim 1, wherein the atomic percent of Mo is between 3 and 5, and the atomic percent of Nb is between 3 and 5.

4. The alloy of claim 1, wherein a combined atomic percent of P and B is between 18.5 and 20.5.

5. The alloy of claim 1, wherein the atomic percent of P is between 16 and 17, and the atomic percent of B is between 2.75 and 3.75.

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

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

8. The alloy of claim 1, wherein the alloy is selected from a group consisting of Ni_72.8Mo₄Nb₄P_16.08B_3.12, Ni_72.3Mo₈P_16.5B_3.2, Ni_72.3Mo₄Nb₄P_16.5B_3.2, Ni_72.3Mo_3.5Nb_4.5P_16.5B_3.2, Ni_72.3Mo₄Nb₄P_16.2B_3.5, Ni_72.3Mo₃Nb₅P_16.5B_3.2, Ni_72.3Mo_4.5Nb_3.5P_16.5B_3.2, Ni_72.3Mo₅Nb₃P_16.5B_3.2, Ni_72.3Mo₄Nb₄P_17.2B_2.5, and Ni_72.3Mo₄Nb₄P_16.7B₃.

9. The alloy of claim 1, wherein the alloy is capable of forming an object comprising a metallic glass having a lateral dimension of at least 1 mm.

10. An alloy comprising:

Ni_{(100-a-b-c-d-e)}Mo_aNb_bMn_cP_dB_e,

wherein subscripts a, b, c, d, and e denote atomic percents for Mo, Nb, Mn, P and B, respectively, a is between 1 and 5, b is between 3 and 5, c is up to 2, d is between 16 and 17, and e is between 2.75 and 3.75, wherein the alloy is capable of forming an object comprising a metallic glass having a lateral dimension of at least 1.5 mm.

11. The alloy of claim 10, wherein a combined atomic percent of Mo and Mn is between 3 and 5, wherein the atomic percent of manganese is between 0.5 and 1.5, and wherein the alloy is capable of forming an object comprising a metallic glass having a lateral dimension of at least 2 mm.

12. The alloy of claim 11, wherein the combined atomic percent of Mo and Mn is between 3.5 and 4.5, wherein the atomic percent of Mn is between 0.75 and 1.25, and wherein the alloy is capable of forming an object comprising a metallic glass having a lateral dimension of at least 2.5 mm.

13. The alloy of claim 10, wherein the alloy is selected from a group consisting of Ni_72.3Mo_3.5Nb₄Mn_0.5P_16.5B_3.2, Ni_72.3Mo₃Nb₄Mn₁P_16.5B_3.2, and Ni_72.3Mo_2.5Nb₄Mn_1.5P_16.5B_3.2.

14. The alloy of claim 10, wherein up to 1 atomic percent of P is substituted by Si.

15. The alloy of claim 10, wherein up to 2 atomic percent of Ni is substituted by Fe, Co, W, Ru, Re, Cu, Pd, Pt, or combinations thereof.

16. A metallic glass comprising the alloy of claim 10.

17. The metallic glass of claim 16, wherein the stress intensity at crack initiation when measured on a 2 mm diameter rod containing a notch with length between 0.75 and 1.25 mm and root radius between 0.1 and 0.15 mm is at least 60 MPa m^1/2.

18. The metallic glass of claims 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.

19. A method of producing the metallic glass of claim 16, the method comprising:

melting the alloy; and

quenching the molten alloy at a cooling rate sufficiently rapid to prevent crystallization of the alloy.

20. The method of claim 19, further comprising fluxing the molten alloy prior to quenching by using a reducing agent.