Self-accommodation and morphological characteristics of the B33 martensite in Zr–Co–Pd alloys

M. Matsuda, K. Arai, M. Mitsuhara, Y. Yamabe-Mitarai, Minoru Nishida

Research output: Contribution to journalArticlepeer-review

Abstract

Thermoelastic martensitic transformation (MT) plays a vital role in shape memory effects and superelasticity of various alloys. To understand the self-accommodation mechanism of the MT of Zr–Co–Pd alloys, which demonstrate typical MT from B2 to B33 structure, the configuration of the alloy’s martensite variants and their crystallographic relationship were investigated by electron backscatter diffraction, transmission electron microscopy, and high-angle annular dark-field scanning transmission electron microscopy. Results suggest that two habit plane variants (HPVs) bounded by {021}B33 compound twinning are formed around each < 100> B2 axes of the B2 parent phase. It is determined that the minimum self-accommodation unit, to relax the strain energy accompanying MT, is a pair of trapezoid- or triangle-shaped HPVs. No lattice invariant shear exists in the martensite variants with a trapezoid- or triangle-shape. In the latter stage of MT, each HPV pair may contact and impinge on {110}B2 plane of B2 parent phase, which is shear and shuffling plane on MT. The combination of the four variants forms the roof-type morphology.

Original languageEnglish
Pages (from-to)5899-5909
Number of pages11
JournalJournal of Materials Science
Volume56
Issue number9
DOIs
Publication statusPublished - Mar 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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