TY - JOUR
T1 - Crystallography of stress-induced B 2 - ζ2′ (trigonal) martensitic transformation in Au-49.5 at.%Cd alloy
AU - Murakami, Yasukazu
AU - Ohba, Takuya
AU - Morii, Koichi
AU - Aoki, Shingo
AU - Otsuka, Kazuhiro
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/5
Y1 - 2007/5
N2 - 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.
AB - 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.
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U2 - 10.1016/j.actamat.2007.01.019
DO - 10.1016/j.actamat.2007.01.019
M3 - Article
AN - SCOPUS:34247146062
VL - 55
SP - 3203
EP - 3211
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 9
ER -