Ternary and multi-nary iron-based bulk glassy alloys and nanocrystalline alloys
First Claim
1. A soft magnetic bulk amorphous alloys represented by the formula (FeaM′
-
a′
)(XbX′
b′
)(ZcZ′
c′
), wherein Fe is an iron, X is the other metallic element, and Z is one metalloid or non-metallic element; and
M′
, X′
, Z′
represent the partial substitution element for Fe, X and Z, respectively;
a, a′
, b, b′
, c, and c′
represent the atomic percentage of Fe, M′
, X, X′
, Z, and Z′
, respectively, and a+a′
+b+b′
+c+c′
=100%;
characterized in that;
1) X is selected from one of the metallic elements with atomic radius at least 130% that of Fe;
Z is selected from one of the metalloid or non-metallic elements with an atomic radius at most 86% that of Fe; and
the composition range lies in 35%<
a+a′
<
89%, 1%<
b+b′
<
20%, and 10%<
c+c′
<
45%;
2) Fe, and X, Z selected by the aforementioned rule should possess eutectic point with each other, wherein the Fe—
X eutectic is at Fe-rich terminal of the Fe—
X binary phase diagram; and
3) the substitution elements M′
, X′ and
Z′
are for the adjustment of properties, and their selection is not limited by the rules stated above, with their substitution amount, in atomic percent, 0.1<
a′
, b′
, c′
<
40.
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Accused Products
Abstract
Disclosed in this invention is a family of ternary and multi-nary iron-based new compositions of bulk metallic glasses which possess promising soft magnetic properties, and the composition selection rules that lead to the design of such new compositions. The embodiment alloys are represented by the formula MaXbZc, where M represents at least one of ferromagnetic elements such as iron and may partly be replaced by some other substitute elements; X is an element or combinations of elements selected from those with atomic radius at least 130% that of iron and in the mean time is able to form an M-rich eutectic; and Z is an element or combinations of elements selected from semi-metallic or non-metallic elements with atomic radius smaller than 86% that of iron and in the meantime is able to form an M-Z eutectic; a, b, c are the atomic percentage of M, X, Z, respectively, and a+b+c=100%. When 1%<b<15% and 10%<c<39%, the alloys show a bulk glass forming ability to cast amorphous ribbons/sheets at least 0.1 mm in thickness. When 3%<b<10% and 18%<c<30%, the alloys show a bulk glass forming ability to cast amorphous rods at least 1 mm in diameter. The amorphous phase of these as-cast sheets/rods is at least 95% by volume. This invention also discloses the existence of nano-crystalline phase outside of the outer regime of the bulk glass forming region mentioned above.
64 Citations
20 Claims
-
1. A soft magnetic bulk amorphous alloys represented by the formula (FeaM′
-
a′
)(XbX′
b′
)(ZcZ′
c′
), wherein Fe is an iron, X is the other metallic element, and Z is one metalloid or non-metallic element; and
M′
, X′
, Z′
represent the partial substitution element for Fe, X and Z, respectively;
a, a′
, b, b′
, c, and c′
represent the atomic percentage of Fe, M′
, X, X′
, Z, and Z′
, respectively, and a+a′
+b+b′
+c+c′
=100%;
characterized in that;
1) X is selected from one of the metallic elements with atomic radius at least 130% that of Fe;
Z is selected from one of the metalloid or non-metallic elements with an atomic radius at most 86% that of Fe; and
the composition range lies in 35%<
a+a′
<
89%, 1%<
b+b′
<
20%, and 10%<
c+c′
<
45%;
2) Fe, and X, Z selected by the aforementioned rule should possess eutectic point with each other, wherein the Fe—
X eutectic is at Fe-rich terminal of the Fe—
X binary phase diagram; and
3) the substitution elements M′
, X′ and
Z′
are for the adjustment of properties, and their selection is not limited by the rules stated above, with their substitution amount, in atomic percent, 0.1<
a′
, b′
, c′
<
40. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
a′
-
19. A ternary and multinary iron-based nanocrystalline alloys represented by formula MaXbZc, characterized in that:
-
M mainly contains iron and may contain a small amount of other ferromagnetic or non-ferromagnetic elements;
X is an element or the mixture of the elements with atomic radius at least 130% that of iron and a small amount of other additive elements;
Z is an element or the mixture of elements with radius at most 86% that of Fe;
a, b and c being the atomic percentage of M, X and Z respectively, and a+b+c=100;
the composition range to form nanocrystalline rods with a diameter of at least 0.5 mm lie in two composition regions;
(1) 73%<
a<
85%, 1%<
b<
15%, 9%<
c<
15%, and (2) 53%<
a<
62%, 2%<
b<
11%, 35%<
c<
41%; and
the composition range to form nanocrystalline rods with a diameter of at least 1 mm lie in five composition regions;
(1) 73%<
a<
79%, 2%<
b<
9%, 17%<
c<
19%;
(2) 74%<
a<
78%, 2%<
b<
4%, 19%<
c<
23%;
(3) 71%<
a<
73%, 3%<
b<
5%, 23%<
c<
25%;
(4) 65%<
a<
70%, 4%<
b<
9%, 25%<
c<
27%, excluding b=6±
0.5; and
(5) 67%<
a<
69%, 9%<
b<
11%, 21%<
c<
23%. - View Dependent Claims (20)
-
Specification