Fe-Ga Magnetostrictive Member with Groove-Induced Lattice Alignment
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Solution Overview
Problem
Existing magnetostrictive members made from Fe--Ga alloys exhibit variations in magnetostriction constant and parallel magnetostriction amount, despite having uniform Ga concentration and aligned crystal orientation, affecting device performance.
Innovation Solution
Manufacture a magnetostrictive member with a lattice constant in the short-side direction larger than in the long-side direction by forming grooves on the surface to align lattice constants uniformly, enhancing the magnetostriction constant and parallel magnetostriction amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single crystal of Fe-Ga alloy is manufactured with uniform Ga concentration and aligned crystal orientation, then the magnetostriction constant should be uniform, but variations in magnetostriction constant and parallel magnetostriction amount still occur
Solution Approach 1:
The patent applies local quality by creating asymmetric groove patterns on specific surfaces of the magnetostrictive member. grooves are formed only on the first surface rather than uniformly across all surfaces, and the groove depth, width, and spacing are specifically optimized for that surface. This localized structural modification creates differential stress distribution that compensates for inherent crystallographic variations, thereby stabilizing the magnetostriction constant and parallel magnetostriction amount across the entire member despite variations in Ga concentration and crystal orientation.
2Reliability
If the lattice constant is made uniform across the member, then manufacturing complexity increases, but device performance still varies
Solution Approach 1:
The patent applies parameter changes by modifying the physical and geometric parameters of the surface structure through groove formation. The groove depth, width, spacing, and pattern are specifically optimized to induce controlled stress fields that compensate for crystallographic variations. By changing the surface geometry parameters rather than attempting to control the bulk lattice constant, the patent achieves stable magnetostriction properties with simpler manufacturing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method stabilizes the magnetostriction constant and parallel magnetostriction amount, reducing variations and improving device performance by maintaining a high level of both properties consistently across members.
Implementation Method 1
Magnetostrictive materials are attracting attention as functional materials. For example, Fe—Ga alloys, which are iron-based alloys, are materials exhibiting the magnetostrictive effect and the reverse magnetostrictive effect, showing a large magnetostriction of about 100 to 350 ppm.
Implementation Method 2
In this magnetostrictive vibration power generation device, as a mechanism, when the yoke as a movable part of the device is vibrated, the Fe—Ga magnetostrictive member fixed at the center of the yoke vibrates in tandem, the magnetic flux density of the coil wound on the Fe—Ga magnetostrictive member changes due to the reverse magnetostriction effect, and electromagnetic induction electromotive force is generated to generate power.
Data Source
AI summary
The magnetostrictive member is formed of a single crystal of an iron-based alloy having magnetostrictive characteristics, is a plate-like body having a long-side direction and a short-side direction, and has a lattice constant of a <100> orientation in the short-side direction larger than a lattice constant of a <100> orientation in the long-side direction.