Galfenol-based sensor/actuator devices for smart by-wire steering system for automobile technology

Yasubumi Furuya, Chihiro Saito, Teiko Okazaki, Kazumi Okada, Yusuke Sado, Takeo Chinen, Naoki Ogasawara, Muneaki Shimada

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Polycrystalline Galfenol (Fe-Ga-X, X=Al, C, Zr etc.) alloys were fabricated as a bulk sample from ark-melted and annealing process method for enhancing various engineering applicability. (Fe-Ga0.15-A10.05)99.0-Zr0.5-C0.5 [at.%] sample showed a maximum magnetostriction of 134 ppm as well as a tensile stress over σ=800MPa. This large magnetostriction is caused by A2 phases without the excessive precipitation of ordered phases such as fcc ordered L12 and bcc ordered D03 phases. Secondarily, we will introduce an application as a smart torque sensor by utilizing Galfenol-ring around the steering shaft for steering-by-wire system of automobile. In this system, a torque sensing system by using the magnetostrictive ring of FeGa (Galfenol) alloy was developed and magnetic flux leaked from the Galfenol ring attached on the rotating shaft was experimentally measured by using two differential Hall probe sensor. As a result, the sensitivity in (Fe0.80Ga 0.15Al0.05)99Zr0.5C0.5 ring increased by 2.9 times in comparison with the (Fe0.80Ga 0.15Al0.05)98.5C1.5 alloy at rotations speed 500 rpm.

Original languageEnglish
Title of host publicationMagnetic Shape Memory Alloys
Number of pages9
Publication statusPublished - 2010
Externally publishedYes
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: 2009 Nov 302009 Dec 4

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2009 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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