US 10,895,005 B2Granted

Metallic glass composites with controllable work-hardening capacity

AssigneeSeoul National University R&Db Foundation

InventorsEun Soo Park, Wookha Ryu, Hyun Seok Oh, Jinwoo Kim, So Yeon Kim

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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.

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 (Eta), a phase transformation temperature (TMs), or hardness (H2nd) to satisfy at least one of the following conditions,
wherein:
absorbed energy (Epa,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 (Eta) of the phase-transformable metastable B2 second phase satisfy the following Equation:
Epa,V=A0Eta−B0
(A0=about 5(±0.5)/103, B0=about 6(±3)/102)unit:
Epa,V(J/cm3vol %), Eta(J/cm3),
the absorbed energy (Epa,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 (TMs) of the phase-transformable metastable B2 second phase satisfy the following Equation:
Epa,V=C0TMs−D0
(C0=about 2.6(±0.2)/103, D0=about 1.6(±0.2)/10)
unit:
Epa,V(J/cm3vol %), TMs(K),
the absorbed energy (Epa,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 (H2nd) of the phase-transformable metastable B2 second phase satisfy the following Equation:
Epa,V=E0H2nd+F0
(E0=about −5(±0.5)/103, F0=about 2.7(±0.5)
unit:
Epa,V(J/cm3vol %), H2nd(HV), or
the hardness value (H2nd) of the phase-transformable metastable B2 second phase and the martensite-start temperature (TMs) thereof satisfy the following Equation:
H2nd=about 469.6±10−0.33±0.1TMs
unit:
H2nd(HV), TMs(K).

18 more elements

Facts

Application

16/106,232Filed 21 Aug 2018 · continuation

Priority

KR 10-2015-01412407 Oct 2015

Published

US 2019/0062884 A128 Feb 2019

Granted

19 Jan 2021

Term ends

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Classification4 codes

C22C 45/10
Amorphous alloys: with molybdenum, tungsten, niobium, tantalum, titanium, or zirconium or Hf as the major constituent
C22C 1/11
Making non-ferrous alloys: making amorphous alloys
C22C 45/001
Amorphous alloys: with Cu as the major constituent
C22C
Alloys

Abstract

Claims7