Journal
MATERIALS & DESIGN
Volume 63, Issue -, Pages 407-411Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2014.06.022
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Funding
- Australian Research Council (ARC) [DP130103592]
- ECM Research Development Grant, the University of Western Australia (UWA)
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In this paper, we have investigated the use of a re-scanning strategy to prevent propagation of macro-cracks during the selective laser melting of an Al85Ni5Y6Co2Fe2 bulk metallic glass composites (BMGCs). These cracks form as a result of the high residual stress caused by the rapid heating and cooling of the material by the laser beam. Unlike crystalline materials, the BMGCs possess a supercooled liquid region in which the residual stress can be relieved by plastic flow. We show that by using a high power initial scan (designed to melt the material) followed by a lower power re-scan (for stress relief) cracking can be prevented. Using this approach, crack-free Al85Ni5Y6Co2Fe2 BMGCs components have been fabricated, including a gear with a diameter similar to 25 mm and height similar to 10 mm. (C) 2014 Elsevier Ltd. All rights reserved.
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