Structural analysis and martensitic transformation in equiatomic HfPd alloy

Shota Hisada, M. Matsuda, K. Takashima, Y. Yamabe-Mitarai

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We investigated the crystal structure and the martensitic transformation in equiatomic HfPd alloy. The analysis of the crystal structure by electron diffraction and Rietveld refinement using X-ray diffraction data indicates that the space group of the martensitic phase is Cmcm, and the lattice parameters are a = 0.329 nm, b = 1.021 nm, and c = 0.438 nm. Martensitic variants are composed of the plate-like morphology of several hundred nm, and the boundaries between the variants have (021)Cmcm twin relations. This (021)Cmcm twin boundary seems to be sharp without ledge and steps. Differential scanning calorimetry measurement indicates that each martensitic transformation temperature is determined to be Ms = 819 K, Mf = 794 K, As = 928 K, and Af = 954 K. Based on the dimension change using a thermo-mechanical analyzer, the expansion and shrinkage of the sample occurred with the forward and reverse martensitic transformation, respectively.

Original languageEnglish
Pages (from-to)712-717
Number of pages6
JournalJournal of Solid State Chemistry
Volume258
DOIs
Publication statusPublished - 2018 Feb 1
Externally publishedYes

Keywords

  • Crystal structure
  • Intermetallics
  • Microstructure
  • Transmission electron microscopy, TEM

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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