Three-dimensional in situ characterization of phase transformation induced austenite grain refinement in nickel-titanium

A. N. Bucsek, L. Casalena, D. C. Pagan, P. P. Paul, Y. Chumlyakov, M. J. Mills, A. P. Stebner

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Near-field and far-field high-energy diffraction microscopy and microcomputed tomography X-ray techniques were used to study a bulk single crystal nickel‑titanium shape memory alloy sample subjected to thermal cycling under a constant applied load. Three-dimensional in situ reconstructions of the austenite microstructure are presented, including the structure and distribution of emergent grain boundaries. After 1 cycle, the subgrain structure is significantly refined, and heterogeneous Σ3 and Σ9 grain boundaries emerge. The low volume and uneven dispersion of the emergent Σ boundaries across the volume show why previous transmission electron microscopy investigations of Σ grain boundary formation were inconsistent.

Original languageEnglish (US)
Pages (from-to)361-366
Number of pages6
JournalScripta Materialia
Volume162
DOIs
StatePublished - Mar 15 2019

All Science Journal Classification (ASJC) codes

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

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