Abstract A new series of glassy metal alloys with near-zero magnetostriction is disclosed. The glassy alloys have the composition (Co x Fe 1 -x ) a B b C c , where x ranges from about 0.84 to 1.0, a ranges from about 78 to 85 atom percent, b ranges from about 10 to 22 atom percent and c ranges from 0 to 12 atom percent, with the proviso that the sum of b and c ranges from about 15 to 22 atom percent. The magnetostriction of these alloys ranges from about +5 × 10 - 6 to -5 × 10 - 6 and the saturation induction is at least about 10 kGauss. The transition metal content is responsible for the low magnetostriction in these alloys, as well as their high saturation induction. The metalloid content (needed to stabilize the glassy state which is one of low anisotropy) strongly affects the saturation induction and Curie temperature, but not the magnetostriction.
A magnetic alloy that is at least 50% glassy, having the formula (Co x Fe 1-x ) a B b C c , where B is boron and C is carbon and where "x" ranges from about 0.92 to 0.96, "a" ranges from about 78 to 85 atom percent, "b" ranges from about 10 to 22 atom percent and "c" ranges from 0 to about 12 atom percent, with the proviso that the sum of "b" and "c" ranges from about 15 to 22 atom percent, said alloy having a value of magnetostriction of essentially zero.
Claim 2
Dependent Claim
96 words
A magnetic alloy that is at least 50% glassy, having the formula (Co x Fe 1-x ) a B b C c , where B is boron and C is carbon and where "x" ranges from about 0.92 to 0.96, "a" ranges from about 78 to 85 atom percent, "b" ranges from about 10 to 22 atom percent and "c" ranges from 0 to about 12 atom percent, with the proviso that the sum of "b" and "c" ranges from about 15 to 22 atom percent, said alloy having a value of magnetostriction of essentially zero.
Claim 3
Dependent Claim
32 words
The magnetic alloy of claim 1 in which "c" ranges from 0 to about 4 atom percent and the sum of "b" and "c" ranges from about 17 to 20 atom percent.
Claim 4
Dependent Claim
16 words
The magnetic alloy of claim 1 having the formula Co 74 Fe 6 B 20 .
Claim 5
Dependent Claim
18 words
The magnetic alloy of claim 1 having the formula Co 74 Fe 6 B 14 C 6 .
Claim 6
Dependent Claim
18 words
The magnetic alloy of claim 1 having the formula Co 74 Fe 6 B 16 C 4 .