Metallic glass composites with controllable work-hardening capacity

Patent metadata

Field	Value
Publication number	US-10895005-B2
Application number	US-201816106232-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Oct 7, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

There are provided metallic glass matrix composites with controllable work-hardening capacity. In more detail, there are provided metallic glass matrix composite with controllable work-hardening capacity capable of having significantly excellent toughness due to a metastable second phase precipitated in-situ in a metallic glass matrix by polymorphic phase transformation during a solidification process without a separate synthetic process, and capable of controlling work-hardening capacity by measuring physical properties of a second phase and adjusting a volume fraction (Vf) of the second phase due to constant correlation between the physical properties (absorbed energy Eta, a phase transformation temperature TMs, or a hardness H2nd) of a metastable B2 second phase precipated in the metallic glass matrix and the absorbed energy (Epa,V) by work-hardening per unit volume fraction of the second phase in the metallic glass matrix.

First claim

What is claimed is:

1. A method for manufacturing a metallic glass composite with controllable work-hardening capacity, the metallic glass composite comprising a metallic glass matrix, and a phase-transformable metastable B2 second phase precipitated in the metallic glass matrix by polymorphic phase transformation, the method comprising:
casting an injected molten metal comprising the metallic glass matrix using arc plasma having output power of about 5 V to about 50 V (output voltage) and about 30 A to about 300 A (output current), and
controlling the work-hardening capacity by adjusting at least one of absorbed energy (E t a ), a phase transformation temperature (T Ms ), or hardness (H 2nd ) to satisfy at least one of the following conditions,
wherein:
absorbed energy (E p a,V ) by work-hardening per unit volume fraction of the phase-transformable metastable B2 second phase in the metallic glass matrix and the absorbed energy (E t a ) of the phase-transformable metastable B2 second phase satisfy the following Equation:
E p a,V =A 0 E t a −B 0

(A 0 =about 5(±0.5)/10 3 , B 0 =about 6(±3)/10 2 )unit: E p a,V (J/cm 3 vol %), E t a (J/cm 3 ),
the absorbed energy (E p a,V ) by work-hardening per unit volume fraction of the phase-transformable metastable B2 second phase in the metallic glass matrix and the martensite-start temperature (T Ms ) of the phase-transformable metastable B2 second phase satisfy the following Equation:
E p a,V =C 0 T Ms −D 0

(C 0 =about 2.6(±0.2)/10 3 , D 0 =about 1.6(±0.2)/10)
unit: E p a,V (J/cm 3 vol %), T Ms (K),
the absorbed energy (E p a,V ) by work-hardening per unit volume fraction of the phase-transformable metastable B2 second phase in the metallic glass matrix and the hardness value (H 2nd ) of the phase-transformable metastable B2 second phase satisfy the following Equation:
E p a,V =E 0 H 2nd +F 0

(E 0 =about −5(±0.5)/10 3 , F 0 =about 2.7(±0.5)
unit: E p a,V (J/cm 3 vol %), H 2nd (HV), or
the hardness value (H 2nd ) of the phase-transformable metastable B2 second phase and the martensite-start temperature (T Ms ) thereof satisfy the following Equation:
H 2nd =about 469.6±10−0.33±0.1 T Ms

unit: H 2nd (HV), T Ms (K).

2. The method of claim 1 , wherein:
the metallic glass matrix comprises about 35 at % to about 58 at % of Ti, about 35 at % to about 50 at % of Cu, about 4.5 at % to about 12 at % of Ni, and about 0.5 at % to about 5 at % of Si.

3. The method of claim 2 , wherein:
the metallic glass matrix further comprises one or more elements selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Al and Sn in a range of about 1 at % to about 15 at %.

4. The method of claim 1 , further comprising:
controlling a volume fraction of the phase-transformable metastable B2 second phase in the metallic glass matrix through a suction casting process.

5. The method of claim 1 , wherein:
the casting the injected molten metal comprises introducing a molten metal into a mold by a pressure of about 0 torr to about 600 torr.

6. The method of claim 1 , wherein:
the casting the injected molten metal comprises adjusting cooling capacity in a range of about 10 1 K/s to about 10 4 K/s.

7. A method for manufacturing a metallic glass composite with controllable work-hardening capacity, the metallic glass composite comprising a metallic glass matrix, and a phase-transformable metastable B2 second phase precipitated in the metallic glass matrix by polymorphic phase transformation, the method comprising:
casting an injected molten metal comprising the metallic glass matrix using arc plasma having output power of about 5 V to about 50 V (output voltage) and about 30 A to about 300 A (output current),
controlling the work-hardening capacity by adjusting at least one of absorbed energy (E t a ), a phase transformation temperature (T Ms ), or hardness (H 2nd ), and
controlling a volume fraction of the phase-transformable metastable B2 second phase in the metallic glass matrix through a suction casting process.

Assignees

• Seoul Nat Univ R&Db Foundation

Inventors

• Park Eun Soo
• RYU Wookha
• Oh Hyun Seok
• Kim Jinwoo
• Kim So Yeon

Classifications

• C22C1/11

  Making amorphous alloys · CPC title

• C22C45/001

  with Cu as the major constituent · CPC title

• C22C45/10 Primary

  with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium {or Hf} as the major constituent · CPC title

• C22C1/002

  Chemistry & Metallurgy · mapped topic