Huge magnetostriction material and mfg. process thereof

Abstract

A giant-magnetostrictive material is (Tb1-x-yDyxRy)(Fe1-z-pBe2Mp)g, where R is chosen from Ho, Er, Pr and Nd, M is chosen from Ti, V, Cr, Co, Ni, Mn, Si, Ga and Al, x=0.65-0.80, y=0-0.15, and g=1.75-2.55. Its preparing process includes smelting mother alloy in Ar atmosphere in vacuum furnace, growing oriented crystallizing material in vacuum or inert gas, and heat treating in vacuum furnace. Its advantages are high magnetostrictive strain ratio, good low-field performance, and low cost.

Description

Technical field:

[0001] The invention belongs to the field of metal materials, and in particular relates to a giant magnetostrictive material mainly with <113> axial orientation and a manufacturing process thereof. Background technique:

[0002] When the magnetization state of a ferromagnetic material changes, its shape and size will change. This phenomenon is called magnetostriction. In the early 1950s, it was discovered that the magnetostrictive strain λ of Ni and Ni-Fe-Co alloys S Can reach 50PPm (1PPm=10 -6 ). People once wanted to use Ni alloy to make magnetostrictive devices. However, because their hysteresis strain is too small, they have not been popularized and applied. Later, people discovered a material with electrostrictive properties, called piezoelectric ceramic material. Among them, the piezoelectric ceramic material with the grade PZT--4 has a stretching strain of 250-400PPm under the action of an electric field. Since then, people have gradually ...