Healable superplastic amorphous alloy
The present disclosure relates to a healable superplastic amorphous alloy, and specifically, to a healable superplastic amorphous alloy capable of exhibiting superplastic behavior and unique healable behavior by maximizing the complexity of the amorphous structure for an Icosahedral quenched-in nuclei quasi-crystal cluster to be formed in the amorphous matrix through the composition limitation and additive element control of Zr—Cu—Ni—Al alloy.
1 . A healable superplastic amorphous alloy comprising Zr, Cu, Ni, Al and an additive element (X), said healable superplastic amorphous alloy being represented by Formula 1:
Zr a Cu b-c X c Ni d Al f [Formula 1]
where X is a combination of two or more selected from the group consisting of V, Mo, Nb, Ta, Ag, and Hf, b-c is 2 or more and 29 or less, c is 1 or more and 10 or less, d is 2 or more and 29 or less, f is 6 or more and 18 or less, and a is 100−(b+d+f),
wherein:
the Ni and the Zr form a principal cluster;
the additive element and the principal cluster form an icosahedral quenched-in nuclei (IQN) quasi-crystal cluster;
the radius of the additive element is 75% or mor and 105% or less with respect to the atomic radius of the Zr; and
wherein Equation 1 below is satisfied for the X in said Formula 1:
⅓(at. % of Nb)+⅓(at. % of Ta)+⅓(at. % of Mo)+ 1/7(at. % of V)+ 1/7(at. % of Hf)+⅙(at. % of Ag)≥1.0 [Equation 1].
2 . The healable superplastic amorphous alloy of claim 1 , wherein a critical cooling rate of a cooling process of molten metal of the healable superplastic amorphous alloy is 10 0 K/s or more and 10 6 K/s or less.
3 . The healable superplastic amorphous alloy of claim 2 , wherein when the additive element is Zr, the content of the Zr is greater than 68 at. % and less than or equal to 73 at. %, the content of the Ni is 2 at. % or more and 24 at. % or less, the content of the Cu is 2 at. % or more and 24 at. % or less, and the content of the Al is 6 at. % or more and 18 at. % or less.
4 . The healable superplastic amorphous alloy of claim 1 , wherein the content of the Zr is 59 at. % or more and 68 at. % or less, the content of the Ni is 2 at. % or more and 29 at. % or less, the content of the Cu is 2 at. % or more and 29 at. % or less, and the content of the Al is 6 at. % or more and 18 at. % or less.
5 . The healable superplastic amorphous alloy of claim 2 , wherein in the cooling process of the molten metal of the healable superplastic amorphous alloy, the thickness of the molten metal is 10 μm or more and 20 mm or less.
6 . The healable superplastic amorphous alloy of claim 1 , wherein the healable superplastic amorphous alloy is an amorphous structure in bulk form, and wherein in a cooling process of molten metal of the superplastic amorphous alloy, a critical cooling rate is 10 0 K/s or more and 10 3 K/s or less.
7 . The healable superplastic amorphous alloy of claim 6 , wherein when the additive element is Zr, the content of the Zr is greater than 68 at. % and less than or equal to 70 at. %, the content of the Ni is 5 at. % or more and 21 at. % or less, the content of the Cu is 5 at. % or more and 21 at. % or less, and the content of the Al is 6 at. % or more and 18 at. % or less.
8 . The healable superplastic amorphous alloy of claim 6 , wherein the content of the Zr is 59 at. % or more and 68 at. % or less, the content of the Ni is 5 at. % or more and 26 at. % or less, the content of the Cu is 5 at. % or more and 26 at. % or less, and the content of the Al is 6 at. % or more and 18 at. % or less.
9 . The healable superplastic amorphous alloy of claim 8 , wherein the healable superplastic amorphous alloy is represented by Formula 2:
Zr a Cu b-c X′ c Ni d Al f [Formula 2]
where X′ is a combination of two or more selected from the group consisting of V, Mo, Nb, Ta, Ag, and Hf,
b−c is 5 or more and 26 or less,
c is 1 or more and 8 or less,
d is 5 or more and 26 or less,
f is 6 or more and 18 or less, and a is 100−(b+d+f).
10 . The healable superplastic amorphous alloy of claim 9 , wherein Equation 2 below is satisfied for the X′ in said Formula 2:
⅓(at. % of Nb)+⅓(at. % of Ta)+⅓(at. % of Mo)+ 1/7(at. % of V)+ 1/7(at. % of Hf)+⅙(at. % of Ag)≥1.0 [Equation 2].
11 . The healable superplastic amorphous alloy of claim 6 , wherein in the cooling process of the molten metal of the healable superplastic amorphous alloy, the thickness of the molten metal is 1 mm or more and 20 mm or less.
12 . The healable superplastic amorphous alloy of claim 1 , wherein the principal cluster is NiZr 2 .
13 . The healable superplastic amorphous alloy of claim 12 , wherein, in the principal cluster, the Ni and the Zr form a polyhedron, and the Ni is disposed at the center of the polyhedron.
14 . The healable superplastic amorphous alloy of claim 13 , wherein the polyhedron is an icosahedron.
15 . The healable superplastic amorphous alloy of claim 1 , wherein the radius of the additive element may be 0.120 nm or more and 0.169 nm or less.
16 . The healable superplastic amorphous alloy of claim 1 , wherein a plastic deformation region of the healable superplastic amorphous alloy is recovered by application of external energy including one selected from the group consisting of mechanical energy, electrical energy, thermal energy, magnetic energy, and combinations thereof.
17 . The healable superplastic amorphous alloy of claim 16 , wherein the external energy is thermal energy, the thermal energy application is a thermo-cycling process in which an environment of −50° C. or less and an environment of 100° C. or more are alternately performed at intervals of a time period of 20 seconds or more.