Crystallography and morphology of various interfaces in Ti-Ni, Ti-Pd and Ni-Mn-Ga shape memory alloys

M. Nishida, T. Hara, M. Matsuda, S. Ii

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29 Citations (Scopus)

Abstract

Crystallography and morphology of various interfaces in Ti-Ni, Ti-Pd and Ni-Mn-Ga shape memory alloys are investigated by transmission electron microscopy. Neither ledge nor step structures are recognized at the irrational interface of the <0 1 1>B19′ type II twin in Ti-Ni martensite and the <1 2 1>B19 type II twin in Ti-Pd martensite in the two dimensional lattice image from the η1 direction. The combination of plate variants of the 10 and the 14 M Ni-Mn-Ga martensites is subsequently discussed. There are four plate variants commonly designated as A, B, C and D, and three fundamental plate combinations can be identified in a given plate group, namely A: B (C: D) of type II, A: C (B: D) of type I and A: D (B: C) of compound twins in both the martensites. An interesting phenomenon is the migration of A: D boundary in the 10 M martensite during the observation. Finally, we present the atomic structures of {1 1 4}B2 Σ9 boundary in the B2 parent phase of Ti-Ni. The influence of heat treatment atmosphere on the boundary structures is also discussed.

Original languageEnglish
Pages (from-to)18-27
Number of pages10
JournalMaterials Science and Engineering A
Volume481-482
Issue number1-2 C
DOIs
Publication statusPublished - May 25 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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