Bulk nickel-phosphorus-boron glasses bearing manganese, niobium and tantalum

Patent metadata

Field	Value
Publication number	US-9863025-B2
Application number	US-201414458091-A
Country	US
Kind code	B2
Filing date	Aug 12, 2014
Priority date	Aug 16, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present disclosure is directed to Ni—P—B alloys and glasses containing small fractions of Nb and Ta and optionally Mn. Over a specific range, the alloys are capable of forming bulk metallic glasses having critical casting thickness in excess of 1 mm. In one embodiment, compositions with a Mn content of between 3 and 4 atomic percent, Nb content of about 3 atomic percent, B content of about 3 atomic percent, and P content of about 16.5 atomic percent, where the balance in Ni, were capable of forming bulk metallic glass rods with diameters as large as 5 mm or larger. In another embodiment, Ni-based compositions with a Mn content of between 5 and 7 atomic percent, Ta content of between 1 and 2 atomic percent, B content of about 3 atomic percent, and P content of about 16.5 atomic percent, where the balance in Ni, were capable of forming bulk metallic glass rods with diameters as large as 5 mm or larger.

First claim

What is claimed:

1. An alloy capable of forming a metallic glass represented by the following formula (subscripts denote atomic percentages):
Ni (100-a-b-c-d) Mn a X b P c B d   (1)

where:
a is 0.25 to 15
b is between 0.5 and 10
c is between 12 and 21
d is between 1 and 6
wherein X is at least one of Nb and Ta, wherein the alloy has a critical rod diameter of at least 1 mm.

2. The alloy of claim 1 , wherein the sum of c and d is between 18.5 and 20.5.

3. The alloy of claim 1 , wherein the sum of c and d is between 19 and 20.

4. The alloy of claim 1 , wherein X is Nb, a is between 0.25 and 5, b is between 1.5 and 4.5, c is between 15.25 to 17.75, and d is between 1.5 and 4.5.

5. The alloy of claim 1 , wherein X is Nb, a is between 0.5 and 4.5, b is between 2 and 4, c is between 15.5 to 17.5, and d is between 2 and 4, and wherein the critical rod diameter is at least 2 mm.

6. The alloy of claim 1 , wherein X is Nb, a is between 1 and 4, b is between 2 and 4, c is between 16 to 17, and d is between 2.25 and 3.75, and wherein the critical rod diameter is at least 3 mm.

7. The alloy of claim 1 , wherein X is Nb, a is between 2.5 and 3.75, b is between 2.5 and 3.5, c is between 16.25 to 16.75, and d is between 2.5 and 3.5, and wherein the critical rod diameter is at least 4 mm.

8. The alloy of claim 1 , wherein X is Ta, a is between 3 and 9, b is between 0.5 and 4.5, c is between 15.25 to 17.75, and d is between 1.5 and 4.5.

9. The alloy of claim 1 , wherein X is Ta, a is between 4 and 8, b is between 0.5 and 4, c is between 15.5 to 17.5, and d is between 2 and 4, and wherein the critical rod diameter is at least 2 mm.

10. The alloy of claim 1 , wherein X is Ta, a is between 4.25 and 7.75, b is between 0.5 and 3.5, c is between 16 to 17, and d is between 2.25 and 3.75, and wherein the critical rod diameter is at least 3 mm.

11. The alloy of claim 1 , wherein X is Ta, a is between 4.5 and 7.5, b is between 0.5 and 3.25, c is between 16.25 to 16.75, and d is between 2.5 and 3.5, and wherein the critical rod diameter is at least 4 mm.

12. A metallic glass comprising an alloy of claim 1 .

13. The metallic glass of claim 12 , wherein the metallic glass has a notch toughness of at least 60 MPa m 1/2.

14. The metallic glass of claim 12 , wherein the metallic glass has a yield strength of at least 2150 MPa.

15. A method of producing the metallic glass of claim 12 comprising:
melting the alloy into a molten state to form a melt; and
quenching the melt at a cooling rate sufficiently rapid to prevent crystallization of the alloy.

16. The method of claim 15 , further comprising fluxing the melt with a reducing agent prior to quenching.

17. The method of claim 15 , wherein the reducing agent is boron oxide.

18. The method of claim 15 , wherein the melt prior to quenching is heated to at least 1200° C.

Assignees

• Glassimetal Tech Inc
• Apple Inc

Inventors

• Na Jong Hyun
• Duggins Danielle
• Floyd Michael
• Garrett Glenn
• Launey Maximilien
• Demetriou Marios D
• Johnson William L

Classifications

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C1/11

  Making amorphous alloys · CPC title

• C22C1/023

  Alloys based on nickel · CPC title

• C22C45/04

  with nickel or cobalt as the major constituent · CPC title

• C22C19/03

  based on nickel · CPC title