Method for manufacturing alloy rod having giant magnetostriction

Details Method for manufacturing alloy rod having giant magnetostriction Method for manufacturing alloy rod having giant magnetostriction

1990-06-18

1991-11-26

Dean, R.

Metal founding

Process

Shaping liquid metal against a forming surface

1566163, 1566164, 148101, 148404, B22D 2704, C30B 1114

Patent

active

050675516

ABSTRACT:
A method for manufacturing an alloy rod having giant magnetostriction, which comprises the steps of: supplying a granular or flaky alloy material, which comprises at least two rare earth metals including terbium and dysprosium and at least one transition metal, into a tubular crucible in an inert gas atmosphere kept under a pressure of from 0.2 to 10 atm., arranged in a vertical cylindrical heating furnace; totally melting the alloy material in the crucible in the heating furnace; and then vertically moving any one of the crucible and the heating furnace at a speed of from 0.1 to 5.0 mm/minute in a temperature region of from 1,270.degree. to 1,180.degree. C. of the heating furnace, in which a temperature decreases at a temperature gradient of from 10.degree. to 100.degree. C./cm, to solidify and crystallize the resultant melt of the alloy material in the crucible in a lower portion of the heating furnace, thereby manufacturing an alloy rod having giant magnetostriction, which comprises a single-crystal structure of a unidirectional-solidification structure consistent with the axial line thereof.

REFERENCES:
patent: 4308474 (1981-12-01), Savage et al.
patent: 4578145 (1986-03-01), Bartlett et al.
patent: 4609402 (1986-09-01), McMasters
J. D. Verhoeven et al., "The Growth of Single Crystal Terfenol-D Crystals", Feb. 1987, vol. 18A, pp. 223-231, Metallurgical Transactions A.

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