Bulk nickel-chromium-phosphorus glasses bearing niobium and boron exhibiting high strength and/or high thermal stability of the supercooled liquid

Patent metadata

Field	Value
Publication number	US-10000834-B2
Application number	US-201414540815-A
Country	US
Kind code	B2
Filing date	Nov 13, 2014
Priority date	Feb 25, 2014
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

Ni—Cr—Nb—P—B alloys and metallic glasses are provided, where Nb and B are varied such as to achieve alloys with good glass forming ability that form metallic glasses which may exhibit unexpectedly high strength and/or high thermal stability of the supercooled liquid. Specifically, the alloys of the current disclosure are capable of forming metallic glasses and have critical rod diameters of at least 3 mm, while the metallic glasses exhibit yield strength greater than 2550 MPa and stability of the supercooled liquid of at least 45° C.

First claim

What is claimed is:

1. An alloy capable of forming a metallic glass represented by the following formula (subscripts a, b, c, and d denote atomic percentages):
Ni (100−a−b−c−d) Cr a Nb b P c B d

wherein:
a ranges from 7 to 11, b ranges from 4.5 to 5.5, c ranges from 13 to 16, d ranges from 4.5 to 5.5; and wherein the critical rod diameter of the alloy is at least 3 mm.

2. The alloy according to claim 1 wherein the metallic glass has a yield strength greater than 2550 MPa.

3. The alloy according to claim 1 wherein the metallic glass has Vickers hardness of at least 742 Kgf/mm 2 .

4. The alloy according to claim 1 wherein up to 1 atomic percent of P is substituted by Si, Sn or combinations thereof.

5. A metallic glass comprising an alloy according to claim 1 .

6. An alloy capable of forming a metallic glass represented by the following formula (subscripts a, b, c, and d denote atomic percentages):
Ni (100−a−b−c−d) Cr a Nb b P c B d
wherein a, b, and c are determined according to the following equations:
a=a 1 +a 2 ·d
c=c 1 +c 2 ·d

wherein
b=b 1 ·d, d ranges from 4.5 to 5.5, a 1 ranges from 10.5 to 12.5, a 2 ranges from −1.1 to −0.9, b 1 ranges from 0.9 to 1.1, c 1 ranges from 19 to 20, c 2 ranges from −1.1 to −0.9; or
b=b 1 +b 2 ·d, d ranges from 4.5 to 6.5, a 1 ranges from 6 to 8, a 2 ranges from 0.3 to 0.55, b 1 ranges from 4 to 5, b 2 ranges from −0.55 to −0.3, c 1 ranges from 19 to 20, c 2 ranges from −1.1 to −0.9; and
wherein the critical rod diameter of the alloy is at least 3 mm.

7. The alloy according to claim 6 wherein d ranges from 4.5 to 6.5, a 1 ranges from 6 to 8, a 2 ranges from 0.3 to 0.55, b 1 ranges from 4 to 5, b 2 ranges from −0.55 to −0.3, c 1 ranges from 19 to 20, c 2 ranges from −1.1 to −0.9; wherein the critical rod diameter of the alloy is at least 3 mm, and wherein the thermal stability of the supercooled liquid of the metallic glass, defined as the difference between T x and T g measured at a scan rate of 20° C./min, is at least 45° C.

8. The alloy according to claim 7 wherein up to 1 atomic percent of P is substituted by Si, Sn or combinations thereof.

9. A metallic glass comprising an alloy according to claim 7 .

10. The metallic glass of claim 9 wherein the notch toughness is at least 55 MPa m 1/2 .

11. The metallic glass of claim 10 wherein the notch toughness is at least 70 MPa m 1/2 .

12. The alloy according to claim 6 wherein d ranges from 4.5 to 5.5, a 1 ranges from 6 to 8, a 2 ranges from 0.45 to 0.55, b 1 ranges from 4 to 5, b 2 ranges from −0.55 to −0.45, c 1 ranges from 19 to 20, c 2 ranges from −1.1 to −0.9; wherein critical rod diameter of the alloys is at least 5 mm, and wherein the thermal stability of the supercooled liquid of the metallic glass, defined as the difference between T x and T g measured at a scan rate of 20° C./min, is at least 50° C.

13. An alloy capable of forming a metallic glass having composition selected from a group consisting of Ni 69 Cr 7 Nb 4.5 P 15 B 4.5 , Ni 69 Cr 6.875 Nb 4.675 P 14.875 B 4.675 , Ni 69 Cr 6.75 Nb 4.75 P 14.75 B 4.75 , Ni 69 Cr 6.675 Nb 4.875 P 14.675 B 4.875 , Ni 69 C 6.5 Nb 5 P 14.5 B 5 , Ni 69 Cr 6.375 Nb 5.125 P 14.375 B 5.125 , Ni 69 Cr 6.25 Nb 5.25 P 14.25 B 5.25 , Ni 69 Cr 6.125 Nb 5.375 P 14.125 B 5.375 , Ni 69 Cr 9.5 Nb 2 P 14.5 B 5 , Ni 69 Cr 9.75 Nb 1.75 P 14 B 5.5 , and Ni 69 Cr 10.25 Nb 1.25 P 13 B 6.5 .

Assignees

• Glassimetal Tech Inc
• Apple Inc

Inventors

• Na Jong Hyun
• Launey Maximilien
• Duggins Danielle
• Abarca Oscar
• Demetriou Marios D
• Johnson William L

Classifications

• C22C45/04 Primary

  with nickel or cobalt as the major constituent · CPC title

• C22C1/11

  Making amorphous alloys · CPC title

• C22C1/002

  Chemistry & Metallurgy · mapped topic