Journal
ACTA MATERIALIA
Volume 60, Issue 2, Pages 476-486Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.10.018
Keywords
Magnesium; Micromechanics; Twinning
Funding
- Office of Basic Energy Sciences [FWP 06SCPE401]
- Office of Basic Energy Sciences under US DOE [W-7405-ENG-36]
- CNRS
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The present work is dedicated to the development of a mean-field continuum mechanics method capable of predicting internal stresses in parent and twin phases during first- and second-generation twinning. For that purpose, a generalized Tanaka-Mori scheme in heterogeneous elastic media with plastic incompatibilities is developed. The work is applied to the case of first- and second-generation twinning in hexagonal close packed magnesium. In the case of first-generation twinning, the model is capable of predicting the trends in the development of back-stresses within the twin domain. A parametric study is performed to explain the roles of grain and twin shape and of relative volume twin volume fractions on the magnitude and directions of the back-stresses. In addition, applying the methodology to the case of second-generation twinning allows identification, in exact agreement with experimental observations, of the most likely second-generation twin variants to grow in a primary twin domain. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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