Journal
ACTA MATERIALIA
Volume 131, Issue -, Pages 271-279Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.03.058
Keywords
Phase transformation; Dislocation source; Twinning
Funding
- National Natural Science Foundation of China [51301207]
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts264]
- Nebraska Center for Energy Sciences Research at the University of Nebraska-Lincoln
- Australian Research Council [DP150101121]
- Louisiana State University
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Identifying the character and the source of partial dislocations associated phase transformation from a hexagonal close-packed (HCP) structure to a face-centered cubic (FCC) structure is essential for understanding phase transformation mechanisms, but was rarely done using microscopy. Here, we report a stress-induced HCP to FCC phase transformation in pure hafnium during cold rolling. Detailed transmission electron microscopy investigations revealed that transformation-related partials stemmed from the dissociation of -type dislocations. Successive gliding of partials on every other basal plane resulted in the orientation relationship between the two phases of <1120>(hcp)//<110 >(fcc), <1010>(hcp)// <112 >(fcc), and [0001](hcp)//<111 >(fcc).Besides, a new way to form a twin relationship in the FCC structure was discovered. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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