JP2000212707A - High magnetostriction amorphous alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high magnetostriction amorphous alloy combining high amorphous formability, high magnetostriction characteristics and tensile strength and practically useful. SOLUTION: This alloy has a compsn. shown by the formula of FeMx Ry Bz [M denotes one or >= two kinds of elements selected from the group of Ti, Cr, Mn, Co, Cu, Nb, Mo, W and Ta; R denotes one or >= two kinds of elements selected from Ce, Pr, Nd, Sm, Tb, Dy and Er, (x), (y) and (z) respectively denote atomic %, 5<x<30, 1.5<y<4 and 18<z<22 are satisfied, and the balance Fe with inevitable impurities] and contg. an amorphous phase of >=90% by a volume fractional rate. The alloy has high amorphous formability at >=20 deg.C temp. width in a supercooled liq. region and mooeber has >=40×10-6 high magnetostriction characteristics and >=2600 MPa tensile strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high magnetostrictive material excellent in large amorphous forming ability and tensile strength.

[0002]

2. Description of the Related Art Conventionally, magnetostrictive materials used for ultrasonic transmitters and the like include pure Ni, 13% Al--Fe alloy, Ni
-Co alloy, Ni-Cu-Co alloy, or ferrite. The magnitude of the magnetostriction of these conventional materials is
Generally, it has a size of only about 30 × 10 ^−6, and has a serious drawback that a giant transmitting element and a powerful electric transmitter are required to obtain a large-amplitude magnetostrictive vibration.

A Fe—Co—Si—B amorphous alloy has high magnetostriction characteristics (λs> 40 × 10 ⁻⁶ ), but has a low amorphous forming ability. ,
Only an amorphous material such as a fine line is obtained.

[0004] Amorphous alloys exhibiting a glass transition, that is, having a supercooled liquid region, are known to have large amorphous forming ability. It is possible to produce thick ribbons and bulk amorphouss by liquid quenching. On the other hand, it is known that when an amorphous alloy is heated, a specific alloy system transitions to a supercooled liquid state before crystallization, and shows a sharp decrease in viscosity. In such a supercooled liquid state, since the viscosity of the alloy is reduced, it is possible to produce an amorphous alloy formed body having an arbitrary shape by a method such as closed forging. Therefore, it can be said that an amorphous alloy having a supercooled liquid region has a large amorphous forming ability and excellent workability.

[0005]

In the magnetostrictive material described above, the magnitude of magnetostriction of the crystalline metal is a low value of 30 × 10 ⁻⁶ or less. Amorphous alloys have higher magnetostrictive properties, but conventional amorphous alloys do not exhibit a supercooled liquid region and do not have a large amorphous forming ability and excellent workability. Accordingly, an object of the present invention is to provide an Fe-based amorphous alloy having high magnetostriction characteristics, large amorphous forming ability, excellent workability, and high mechanical properties.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have studied the optimum composition of an Fe-based amorphous alloy, and as a result, have found that an Fe-MB system having a specific composition has been specified. Amount of R element (M is Ti, Cr, Mn, Co, C
1 selected from the group consisting of u, Nb, Mo, W, and Ta
The species or two or more elements, R is Ce, Pr, Nd, S
(m, Tb, Dy, Er) or an alloy containing at least two elements selected from the group consisting of m, Tb, Dy, and Er. The present inventors have found that an Fe-based amorphous alloy having a quality-forming ability can be obtained, and have completed the present invention.

That is, the present invention provides a compound represented by the formula: FeM _x R _y B
_z [where M is Ti, Cr, Mn, Co, Cu, N
one or more elements selected from the group consisting of b, Mo, W, and Ta, and R is Ce, Pr, Nd, Sm, T
one or two selected from the group consisting of b, Dy, Er
X, y and z each represent atomic%, and 5 <x <30, 1.5 <y <4, 18 <z <
22 and the remainder consists of Fe and unavoidable impurities].
High magnetostrictive amorphous alloy containing 0% or more.

According to the alloy composition of the present invention, the supercooled liquid region has a large temperature range of 20 ° C. or more, has a large amorphous forming ability, and has a magnetostrictive property of 40 × 10 ^-6 or more. Quality alloys can be produced. Further, the alloy of the present invention has a tensile strength of 2600 MPa or more.

As described above, the present invention provides a completely new high magnetostrictive amorphous alloy which overcomes the drawbacks of the conventional materials.

The "supercooled liquid region" in this specification is defined as the difference between the glass transition temperature and the crystallization temperature obtained by performing differential scanning calorimetry at a heating rate of 40 ° C. per minute. Things. The “supercooled liquid region” is a numerical value indicating the resistance to crystallization, that is, the stability of amorphous.

[0011]

Embodiments of the present invention will be described below.

With respect to materials having the alloy compositions shown in Table 1 (Examples 1 to 11 and Comparative Examples 2 to 6), a master alloy was melted by an arc melting method, and then an amorphous ribbon was formed by a single roll liquid quenching method. Was prepared. The glass transition temperature (Tg) and the crystallization onset temperature (Tx) of these amorphous ribbons were measured by a differential scanning calorimeter (DSC). The supercooled liquid region (Tx-Tg) was calculated from these values. Magnetostriction (λ _s ) was measured using an amorphous ribbon by the capacitance method with an applied magnetic field of 240 kA / m. Tensile strength (σ _f ) was measured with an Instron type tensile tester.

As is apparent from Table 1, Examples 1 to 11
The amorphous material produced by the single roll liquid quenching method of
It exhibits a supercooled liquid region of 0 ° C. or higher, and has excellent strength, a magnetostriction property of 40 × 10 ⁻⁶ or more, a tensile strength of 2700 MPa or more, a magnetostriction property, and an amorphous forming ability.

[0014] However, the Ni metal of Comparative Example 1 has the advantages of low cost and easy production, but has extremely low magnetostriction constant and strength. The amorphous alloys of Comparative Examples 2 and 3 have high magnetostriction characteristics, but do not show a supercooled liquid region. The amorphous alloys of Comparative Examples 4, 5, and 6 have high magnetostriction characteristics, but are low in amorphous forming ability and thermal stability.

[0015]

[Table 1]

[0016]

As described above, the high magnetostrictive amorphous alloy of the present invention exhibits a supercooled liquid region of 20 ° C. or higher, and has a high magnetostrictive characteristic of 40 × 10 ⁻⁶ or higher, more preferably 2 × 10 ⁻⁶ or more.
Has a tensile strength of 600 MPa or more. From this, it is possible to provide a practically useful high magnetostrictive amorphous alloy having both high amorphous forming ability, high magnetostriction characteristics, and tensile strength.

Claims (3)

[Claims] 1. The formula: FeM _x R _y B _z [where M is T
one or more elements selected from the group consisting of i, Cr, Mn, Co, Cu, Nb, Mo, W, and Ta;
Is one or more elements selected from the group consisting of Ce, Pr, Nd, Sm, Tb, Dy, and Er;
x, y and z each represent atomic%, and 5 <x <3
0, 1.5 <y <4, 18 <z <22, and the balance consists of Fe and unavoidable impurities], and the amorphous phase has a volume fraction of 90% or more. Including high magnetostrictive amorphous alloys. 2. The supercooled liquid region according to claim 1, wherein the temperature range of the supercooled liquid region is 20 ° C. or more, and the supercooled liquid region has a large amorphous forming ability and also has high magnetostriction characteristics of 40 × 10 ^-6 or more. High magnetostrictive amorphous alloy. 3. The high magnetostrictive amorphous alloy according to claim 1, having a tensile strength of 2600 MPa or more.