Non-ferromagnetic amorphous steel alloys containing large-atom metals
AssigneeUniversity of Virginia Patent Foundation
InventorsS. Poon, Vijayabarathi Ponnambalam, Gary Shiflet
Life of this patent
Estimating the term…
Abstract
The present invention relates to novel non-ferromagnetic amorphous steel alloys represented by the general formula: Fe—Mn-(Q)-B-M, wherein Q represents one or more elements selected from the group consisting of Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and M represents one or more elements selected from the group consisting of Cr, Co, Mo, C and Si. Typically the atomic percentage of the Q constituent is 10 or less. FIG. 2B represents a differential thermal analysis plot for several exemplary alloys according to the invention.
Claims93
An amorphous alloy represented by the formula:
- Fe(100-t)MnnCrmMopBqMdXrZsQg
- wherein X is an element selected from the group consisting of Ti, Zr, Hf, Nb, V, W and Ta;
- Z is an element selected from the group consisting of C, Co or Ni;
- Q is an element selected from the group consisting of Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- M is an element selected from the group consisting of Al, Ga, In, Sn, Si, Ge and Sb;
- n, m, p, q, d, r, s and g are atomic percentages, wherein
- n is a number selected from 0 to about 29;
- m and p are independently a number selected from 0 to about 16, wherein n+m is at least 10;
- q is a number selected from about 6 to about 21;
- r and d are independently selected from 0 to about 4;
- s is a number selected from 0 to about 20;
- g is a number greater than 0 but less than or equal to about 10;
- and
- t is the sum of n, m, p, q, r, s, d and g, with the proviso that t is a number selected from about 40 to about 60.
An iron-based amorphous alloy represented by the formula:
- Fe(100-t)MnnCrmBqSidMor1Nbr2Tar3NisQg
- wherein Q is an element selected from the group consisting of Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- n is a number selected from about 15 to about 29;
- m is a number selected from 0 to about 4, wherein
- n+m is at least 15;
- q is a number selected from about 17 to about 21;
- d is a number selected from 0 to about 4;
- r1, r2 and r3 are numbers independently selected from 0 to about 4;
- s is a number selected from 0 to about 20;
- g is a number selected from about 4 to about 8;
- and
- t is the sum of n, m, q, r1, r2, r3, d, s and g, with the proviso that t is a number selected from about 40 to about 65.
An iron-based amorphous alloy represented by the formula:
- Fe(100-t)MnnCrmMopBqCsQgPz
- wherein Q is an element selected from the group consisting of Sc, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
- n is a number selected from 0 to about 29;
- m is a number selected from 0 to about 16, wherein
- n+m is at least 10;
- p is a number selected from about 0 to about 16;
- q is at least about 4;
- s is at least about 13;
- g is a number greater than 0 but less than or equal to about 3;
- z is a number selected from about 5 to about 12;
- and t is the sum of n, m, p, q, s, g and z, with the proviso that the sum of p and g is less than 16, and t is not greater than 55.
An alloy comprising an iron-based amorphous alloy represented by the formula:
- Fe(100-t)MnnCrmMopBqMdXrZsQg
- wherein M represents one or more elements selected from the group consisting of Al, Ga, In, Sn, Si, Ge and Sb;
- X represents one or more elements selected from the group consisting of Ti, Zr, Hf. Nb, V, W and Ta;
- Z is an element selected from the group consisting of C, Co or Ni;
- Q represents one or more large-atom metals wherein the sum of the atomic percentage of said large-atom metals is equal to g;
- n, m, p, q, d, r, s and g are atomic percentages, wherein
- n is a number selected from 0 to 29;
- m and p are independently a number selected from 0 to 16,
- wherein n+m is at least 10;
- q is a number selected from 4 to 21;
- r and d are independently selected from 0 to 4;
- s is a number selected from 0 to 20;
- g is a number greater than 0 but less than or equal to 10;
- and
- t is the sum of n, m, p, q, r, s, d and g, with the proviso that t is a number selected from 40 to 60.
A method of preparing homogeneous ingots of an iron-based amorphous alloy comprising large-atom metals, manganese and boron, said method comprising the steps of
- forming an FeB precursor ingot;
- forming a Mn-large-atom metal precursor ingot;
- melting and mixing the FeB precursor ingot with the remaining elements of the alloy, but excluding the Mn-large-atom metal precursor ingot, to form an alloy mixture;
- combining said alloy mixture with the manganese Mn-large-atom metal precursor ingot;
- and
- melting the combination together to form a homogenous ingot.
Dependencies are inferred from the claim text.