Heat treatment method for improving magnetostrictive property of Tb<x>Dy<1-x>Fe<y> alloy bars with <112> axial alignment

A heat treatment method and axial orientation technology are applied in the field of magnetic materials to achieve the effects of convenient commercial production, linear segment growth, and simple and easy implementation steps.

Inactive Publication Date: 2010-07-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no systematic study on the influence of the magnetic field heat treatment temperature, holding time, magnetic field size, and the axial angle between the magnetic field direction and the TbDyFe alloy rod on the magnetostrictive properties of axially oriented alloy rods under low magnetic field. The present invention mainly focuses on improving the magnetostrictive performance of axially oriented TbDyFe alloy by using magnetic field heat treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) axially oriented Tb x Dy 1-x Fe y Alloy (where x=0.1~0.4, y=1.5~1.99) is cut into Φ5×30mm after the surface and both ends are polished 3 The standard alloy rod, and measure the magnetostriction value λ of the alloy rod with the external magnetic field H and the relationship between the change rate dλ / dH and H of the magnetostriction value λ with H. Get the saturation magnetostriction value λ m 1010ppm, piezomagnetic coefficient d 33 14150×10 -6 T -1 .

[0014] 2) Encapsulate the alloy rod in a vacuum quartz glass tube with a vacuum degree of about 10 -1 Pa, put the packaged quartz glass tube into the middle part of the magnetic field heat treatment furnace tube, uniformly heat up to 400 ° C under the condition of no external magnetic field, and start the furnace cooling after 10 minutes of heat preservation, and apply an external magnetic field at the same time, the magnetic field strength is 0.1T, The direction of the magnetic field is parallel to the axial...

Embodiment 2

[0017] 1) axially oriented Tb x Dy 1-x Fe y Alloy (where x=0.1~0.4, y=1.5~1.99) is cut into Φ7×40mm after the surface and both ends are polished 3 The standard alloy rod, and measure the magnetostriction value λ of the alloy rod with the external magnetic field H and the relationship between the change rate dλ / dH and H of the magnetostriction value λ with H. Get the saturation magnetostriction value λ m 1080ppm, piezomagnetic coefficient d 33 14250×10 -6 T -1 .

[0018] 2) Encapsulate the alloy rod in a vacuum quartz glass tube with a vacuum degree of about 10 -1 Pa, put the packaged quartz glass tube into the middle part of the magnetic field heat treatment furnace tube, uniformly heat up to 500°C under the condition of no external magnetic field, and start the furnace cooling after holding for 10 minutes, and apply an external magnetic field at the same time, the magnetic field strength is 0.1T, The direction of the magnetic field is parallel to the axial direction ...

Embodiment 3

[0021] 1) axially oriented Tb x Dy 1-x Fe y Alloy (where x=0.1~0.4, y=1.5~1.99) is cut into Φ8×45mm after the surface and both ends are polished 3The standard alloy rod, and measure the magnetostriction value λ of the alloy rod with the external magnetic field H and the relationship between the change rate dλ / dH and H of the magnetostriction value λ with H. Get the saturation magnetostriction value λ m 1100ppm, piezomagnetic coefficient d 33 14300×10 -6 T -1 .

[0022] 2) Encapsulate the alloy rod in a vacuum quartz glass tube with a vacuum degree of about 10 -1 Pa, put the packaged quartz glass tube into the middle part of the magnetic field heat treatment furnace tube, uniformly heat up to 500°C under the condition of no external magnetic field, and start the furnace cooling after holding for 10 minutes, and apply an external magnetic field at the same time, the magnetic field strength is 0.1T, The direction of the magnetic field is parallel to the axial direction o...

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Abstract

The invention discloses a heat treatment method for improving the magnetostrictive property of Tb<x>Dy<1-x>Fe<y> alloy bars with <112> axial alignment, comprising the following steps: 1) after polishing the surface and two ends of Tb<x>Dy<1-x>Fe<y> alloy with <112> axial alignment, cutting the Tb<x>Dy<1-x>Fe<y> alloy into alloy bars with specification of phi5*30-10*50mm3; 2) encapsulating the alloy bars in a vacuum quartz glass tube with vacuum degree being about 10<-1>Pa, placing the encapsulated quartz glass tube in the middle part of a furnace tube for magnetic heat treatment, uniformly raising the temperature to 400-900 DEG C in the absence of external magnetic fields, preserving the heat for 10min-2h and then cooling the furnace, simultaneously applying external magnetic fields with strength of 0.1-1.2T, cooling the furnace to the room temperature and then taking out the alloy bars, wherein the magnetic field direction forms an angle of 0-90 degrees with the alloy bars axially. Through magnetic heat treatment, the magnetostriction coefficient lambda and the piezomagnetic coefficient d33 of the Tb<x>Dy<1-x>Fe<y> alloy bars with <112> axial alignment are respectively improved by 45-65% and 240% in the absence of compressive prestress. The magnetostrictive property is further improved after the compressive prestress is applied.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for improving <112> axial preferred orientation Tb x Dy 1-x Fe y A method for the magnetostrictive properties of alloy rods. Background technique [0002] Ferromagnets undergo changes in shape or size under the action of a magnetic field, a phenomenon known as magnetostriction. The magnetostriction coefficient of general strong magnetic material is only 10 -5 ~10 -6 Magnitude. In the 1960s, it was discovered that the magnetostriction of heavy rare earth metals reached 10 -3 order of magnitude, among which the Dy single crystal even reaches 10 -2 Magnitude. But such a large magnetostriction value can only appear at extremely low temperatures, and cannot be used at room temperature. In the early 1970s, the cubic Laves phase compound RFe of rare earth and iron was discovered 2 , has a large magnetostriction coefficient at room temperature, such as single cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/16
Inventor 马天宇张培张昌盛严密
Owner ZHEJIANG UNIV
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