Shape-controlled crystal growth of Fe-Ga alloys to apply a magnetostrictive vibration energy harvester

Masahiko Ito, Kei Kamada, Akira Yoshikawa, Toru Kawamata, Shun Fujieda, Shigeru Suzuki, Tamotsu Minamitani, Toshiyuki Ueno

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Cross-sectional shape-controlled Fe-Ga alloy crystals for energy harvester applications were grown using the micro pulling down (μ-PD) method. The investigation of material concentrations along the growth direction reveals that a high growth rate of 5.0 mm/min raises the effective segregation coefficient of Ga, keff (Ga), and ensures high concentration homogeneity. However, the high growth rate was speculated as causing non-preferentially oriented portion formation that decreases the magnetostrictive property. The magnetostriction 3/2λ = 286 ppm was achieved for a good oriented sample (i.e. the misorientations from 〈100〉 were less than 7.5°.) with the Ga concentration of 16.8 at%. A prototype vibration energy harvester using a plate-shaped Fe-Ga alloy grown at 5.0 mm/min showed comparable or superior performance to the device using commercially available alloys. By leveraging the advantages of near net-shape controlling and a higher growth rate than other crystal growth techniques, the μ-PD method is expected to emerge as a new technique for mass-producing Fe-Ga alloys as materials for energy harvester applications.

Original languageEnglish
Pages (from-to)898-902
Number of pages5
JournalJournal of Alloys and Compounds
Volume731
DOIs
Publication statusPublished - 2018 Jan 15

Keywords

  • Crystal growth
  • Effective segregation coefficient
  • Fe-Ga alloy
  • Magnetostriction
  • Vibration energy harvester
  • μ-PD method

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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