Method for manufacturing alloy rod having giant magnetostriction

摘要

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° to 1,180° C. of the heating furnace, in which a temperature decreases at a temperature gradient of from 10° 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.