Crystallography and morphology of twins in 9R martensite in Ti-Pd-Fe shape memory alloy

S. Ii, M. Nishida, T. Hara

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Twins in 9R martensite in Ti50.0Pd43.0Fe7.0 shape memory alloy are investigated by conventional transmission electron microscopy. There are four twinning modes, i.e., {114}9R Type I, 〈591〉9R Type II, {105}9R compound and {001}9R compound twins. The {114}9R Type I and the 〈591〉9R Type II twins are considered to be lattice invariant shear in the 9R martensite continuously coexisting with 2H martensite. On the other hand, those two twins and {105}9R compound twin can be regarded as variant accommodation twins in the region only consisting of the 9R martensite. Irrational nature of Type II twin boundary, i.e., A:B type pair, is also observed in the edge-on state by high resolution electron microscopy (HREM). The boundary is gradually and randomly curved with strain contrast.

Original languageEnglish
Pages (from-to)549-554
Number of pages6
JournalScripta Materialia
Issue number7
Publication statusPublished - Apr 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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