Medium entropy alloys and methods of preparing the same
Abstract
An embodiment of the present invention provides a medium entropy alloy including an Al-rich FCC phase, a Zn-rich HCP phase, and an intermetallic compound, wherein the Al-rich FCC phase, the Zn-rich HCP phase, and the intermetallic compound include Al, Zn, and Cu, and the intermetallic compound satisfies the following equation 1. 1 9 3 ≤ ( A × B ) / C ≤ 2 4 0 [ Equation 1 ] (In Equation 1, A represents the atom % of Al in the intermetallic compound, B represents the atom % of Cu in the intermetallic compound, and C represents the atom % of Zn in the intermetallic compound.)
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A medium entropy alloy comprising:
an Al-rich FCC phase, a Zn-rich HCP phase and an intermetallic compound, the Al-rich FCC phase, the Zn-rich HCP phase and the intermetallic compound comprise Al, Zn and Cu, and the intermetallic compound satisfies the following equation 1:
1
9
3
≤
(
A
×
B
)
/
C
≤
2
4
0
[
Equation
1
]
(In Equation 1, A represents the atom % of Al in the intermetallic compound, B represents the atom % of Cu in the intermetallic compound, and C represents the atom % of Zn in the intermetallic compound.)
2 . The medium entropy alloy of claim 1 , wherein:
the medium entropy alloy satisfies the following equation:
0.14
≤
(
a
first
peak
×
a
fourth
peak
)
/
a
fifth
peak
≤
0.33
[
Equation
2
]
(In Equation 2, the first peak is the peak intensity when 2θ is 36±5°, the fourth peak is the peak intensity when 2θ is 65±5°, and the fifth peak is the peak intensity when 2θ is 78±5°, in the X-ray diffraction analysis (XRD) spectrum.)
3 . The medium entropy alloy of claim 1 , wherein:
with atom % as reference, the ratio of Zn to Al is 0.8 to 1.2.
4 . The medium entropy alloy of claim 1 , wherein:
with atom % as reference, the ratio of Cu to Al is 0.2 to 1.0.
5 . The medium entropy alloy of claim 1 , wherein:
the medium entropy alloy comprises Al: 33.3 to 45.0%, Zn: 33.3 to 45.0%, Cu: 10 to 33.3% and other impurities in atom %.
6 . The medium entropy alloy of claim 1 , wherein:
the medium entropy alloy comprises a triple phase, wherein, the triple phase includes a first phase with Al as a primary component; a second phase with Zn as a primary component; and a third phase with Al-based intermetallic compounds and Cu-rich.
7 . The medium entropy alloy of claim 6 , wherein:
the first phase includes Al-rich FCC phase.
8 . The medium entropy alloy of claim 6 , wherein:
the second phase includes a Zn-rich HCP phase.
9 . The medium entropy alloy of claim 6 , wherein:
a composition of the first phase, based on the entire mole number of the first phase as a reference, includes Al: 45 to 60%, Zn: 35 to 50%, Cu: 5 to 10% and impurity of the balance in atom %.
10 . The medium entropy alloy of claim 6 , wherein:
a composition of the second phase,, based on the entire mole number of the second phase as a reference, includes Al: 5 to 20%, Zn: 65 to 80%, Cu: 10 to 25% and impurity of the balance in atom %.
11 . The medium entropy alloy of claim 6 , wherein:
a composition of the third phase, based on the entire mole number of the third phase as a reference, includes Al: 40 to 55%, Zn: 5 to 20%, Cu: 35 to 50% in atom %, and inevitable impurity.
12 . The medium entropy alloy of claim 6 , wherein:
the Al based intermetallic compound includes AlCu and Al 2 Cu.
13 . The medium entropy alloy of claim 1 , wherein:
a yield strength of the medium entropy alloy at room temperature 298K is 350 to 380 MPa.
14 . The medium entropy alloy of claim 1 , wherein:
a tensile strength of the medium entropy alloy at room temperature 298K is 405 to 470 Mpa.
15 . The medium entropy alloy of claim 1 , wherein:
an elongation of the medium entropy alloy at room temperature 298K is 1.2 to 5.0%.
16 . The medium entropy alloy of claim 1 , wherein:
the Al and Zn satisfy the following Equation 3.
[
Al
]
=
[
Zn
]
[
Equation
3
]
(Here, [X] means atom % of X)
17 . A method of manufacturing a medium entropy alloy, comprising:
manufacturing an ingot by casting a mixed powder containing Al, Zn, and Cu; quenching the ingot; processing the quenched ingot with severe plastic deformation (SPD); and post-heat treatment for 2 to 50 minutes.
18 . The method of claim 17 , wherein:
the severe plastic deformation process includes the High-Pressure Torsion (HPT) process or Equal Channel Angular Pressing (ECAP) process.
19 . The method of claim 18 , wherein:
a load applied during the High-Pressure Torsion (HPT) process is 38 to 50 tons; and 5 an overall rotation speed is 5 to 40 times.
20 . The method of claim 17 , wherein:
the heat treatment temperature of the post heat treatment step is 250 to 350° C.Join the waitlist — get patent alerts
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