The role of a low-energy-density re-scan in fabricating crack-free Al(85)Ni(5)Y(6)Co(2)Fe(2) bulk metallic glass composites via selective laser melting

Li, X. P., Kang, C. W., Huang, H. and Sercombe, T. B. (2014) The role of a low-energy-density re-scan in fabricating crack-free Al(85)Ni(5)Y(6)Co(2)Fe(2) bulk metallic glass composites via selective laser melting. Materials and Design, 63 407-411. doi:10.1016/j.matdes.2014.06.022

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Author Li, X. P.
Kang, C. W.
Huang, H.
Sercombe, T. B.
Title The role of a low-energy-density re-scan in fabricating crack-free Al(85)Ni(5)Y(6)Co(2)Fe(2) bulk metallic glass composites via selective laser melting
Formatted title
The role of a low-energy–density re-scan in fabricating crack-free Al85Ni5Y6Co2Fe2 bulk metallic glass composites via selective laser melting
Journal name Materials and Design   Check publisher's open access policy
ISSN 0264-1275
1873-4197
Publication date 2014-11
Sub-type Article (original research)
DOI 10.1016/j.matdes.2014.06.022
Open Access Status
Volume 63
Start page 407
End page 411
Total pages 5
Place of publication Camden, London, United Kingdom
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Highlights
• We proposed a re-scan strategy to prevent crack propagation in SLM.
• The re-scan should be carried out at a low laser energy density.
• The underlying mechanism is through reduction and relief of residual stresses.
• Lowered temperature gradient and superplasticity account for reduction of stress.
• For the first time, a crack-free BMGCs gear with a large size was produced.

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 ~25 mm and height ~10 mm.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 20 Aug 2014, 13:56:36 EST by Professor Han Huang on behalf of School of Mechanical and Mining Engineering