Journal
SCRIPTA MATERIALIA
Volume 128, Issue -, Pages 14-17Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.09.015
Keywords
Magnesium alloy; Precipitation; Atom probe tomography; Scanning/transmission electron microscopy (STEM)
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Funding
- U.S. Department of Energy - Basic Energy science program, Center for PRedictive Integrated Structural MaterialsScience (PRISMS Center) at University of Michigan [DE-SC0008637]
- University of Michigan Rackham Graduate School
- Michigan Center for Materials Characterization at the University of Michigan
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Aging of Mg-Nd alloys involves the formation of Guinier-Preston zones followed by beta''' precipitation that is associated with peak hardness. Using atom probe tomography and high-angle annular dark-field scanning transmission electron microscopy, the three-dimensional morphologies of the coherent Guinier-Preston zones and beta' precipitates were quantified. The Guinier-Preston zones form equiaxed plates while the beta' precipitates are elongated along the [0001](Mg) direction thereby minimizing elastic strains. The beta''' precipitates exhibit additional faceting along the [0001](Mg) direction and along the < 1 (1) over bar 01 >(Mg) and < 1 (1) over bar 02 >(Mg) directions when viewed along the < 11 (2) over bar0 >(Mg) zone axes, which can be affected by strain field interactions from nearby precipitates. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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