Crystallography of stress-induced B 2 - ζ2 (trigonal) martensitic transformation in Au-49.5 at.%Cd alloy

Yasukazu Murakami, Takuya Ohba, Koichi Morii, Shingo Aoki, Kazuhiro Otsuka

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Abstract

The crystallography of B 2 - ζ2 (trigonal) stress-induced transformation in Au-Cd has been controversial. The present study was undertaken to clarify this issue by obtaining reliable experimental data, which enabled a critical test for the phenomenological crystallographic theory of martensitic transformation. The results revealed that the lattice invariant shear (LIS) was {1 0 0}〈0 1 1〉C twinning in contrast to {0 1 1}〈1 0 0〉C twinning, which was believed to be the case by all the previous investigators. The theoretical calculations using {1 0 0}〈0 1 1〉C twinning agreed well with the observations in all respects. Therefore, the phenomenological crystallographic theory is shown to be well applicable to the present transformation. In addition to the stress-induced transformation, the morphologies of thermally induced martensites were examined, and two types of morphologies were observed: "roof-type" with LIS, and "herringbone-type" without LIS. Therefore, it is shown that transformations both with and without LIS are possible in the present transformation, and the previous discrepancy in LIS is rationalized.

Original languageEnglish
Pages (from-to)3203-3211
Number of pages9
JournalActa Materialia
Volume55
Issue number9
DOIs
Publication statusPublished - May 1 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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