Electron microscopy investigation of spark-eroded Ni-Mn-Ga ferromagnetic shape-memory alloy particles

Virgil C. Solomon, Jung Il Hong, YunJun Tang, Ami E. Berkowitz, David Smith

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The microstructural and chemical characteristics of Ni-Mn-Ga particles produced by spark-erosion using liquid argon or liquid nitrogen dielectrics were investigated by electron microscopy techniques. The particles were predominantly micron-sized spheres; those obtained in argon were solid, whereas those obtained in nitrogen were primarily hollow. The investigation of annealed particles revealed twinned microstructure and provided evidence supporting the cryogen solubility model of hollow particle formation, as well as possibly explaining the non-homogeneous structure of particles formed by spark-erosion in liquid nitrogen.

Original languageEnglish (US)
Pages (from-to)593-596
Number of pages4
JournalScripta Materialia
Volume56
Issue number7
DOIs
StatePublished - Apr 2007

Keywords

  • Ferromagnetic shape-memory alloys
  • Focused-ion-beam (FIB) microscopy
  • High-resolution electron microscopy
  • Scanning transmission electron microscopy (STEM)
  • Spark-erosion

ASJC Scopus subject areas

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

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