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

研究成果: Contribution to journalArticle査読

8 被引用数 (Scopus)


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.

ジャーナルActa Materialia
出版ステータス出版済み - 5 2007

All Science Journal Classification (ASJC) codes

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

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