Bulk nickel-based chromium and phosphorus bearing metallic glasses with high toughness

Patent metadata

Field	Value
Publication number	US-9863024-B2
Application number	US-201314067521-A
Country	US
Kind code	B2
Filing date	Oct 30, 2013
Priority date	Oct 30, 2012
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A Ni-based bulk metallic glass forming alloy is provided. The alloy includes Ni (100-a-b-c-d) Cr a Nb b P c B 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 .

First claim

What is claimed is:

1. An alloy capable of forming a metallic glass, the alloy comprising:
Ni (100-a-b-c-d) Cr a Nb b P c B d

wherein an atomic percent of chromium (Cr) a ranges from 4 to 9, 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 has a critical rod diameter of at least 9 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 the alloy comprises Ni 77.4375-0.875a Cr a Nb 4.0625-0.125a P 16.5 B 3 , and the atomic percent of Cr a is from 4 to 9.

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

4. 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.

5. 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.

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

7. The alloy of claim 1 , wherein the alloy comprises composition Ni 71.4 Cr 5.52 Nb 3.38 P 16.67 B 3.03 that has a critical rod diameter of at least 10 mm.

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

9. 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 a Nb b P c B d wherein an atomic percent of chromium (Cr) a ranges from 4 to 9, 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), wherein the alloy has a critical rod diameter of at least 9 mm, 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 .

10. The method of claim 9 , further comprising fluxing the molten alloy prior to quenching by using a reducing agent.

11. The method of claim 9 , 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.

12. The method of claim 9 , the step of melting the alloy comprising melting the alloy at a temperature of at least 1100° C.

13. The method of claim 9 , wherein the alloy is selected from a group consisting of compositions Ni 72.5 Cr 4.5 Nb 3.5 P 16.5 B 3 , Ni 71.4 Cr 5.52 Nb 3.38 P 16.17 B 3.03 Si 0.5 , and Ni 70.5 Cr 6.78 Nb 3.22 P 16.5 B 3 .

14. The method of claim 13 , wherein the alloy comprises Ni 71.4 Cr 5.52 Nb 3.38 P 16.67 B 3.03 and has a critical rod diameter of at least 10 mm.

Assignees

• Glassimetal Tech Inc
• Apple Inc

Inventors

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

Classifications

• C22C19/058

  without Mo and W · CPC title

• C22C45/04 Primary

  with nickel or cobalt as the major constituent · CPC title

• C22C19/05

  with chromium · CPC title

• C22C1/11

  Making amorphous alloys · CPC title

• C22C1/002

  Chemistry & Metallurgy · mapped topic