Selective laser melting of an Al(86)Ni(6)Y(4.5)Co(2)La(1.5) metallic glass: processing, microstructure evolution and mechanical properties

Li, X. P., Kang, C. W., Huang, H., Zhang, L. C. and Sercombe, T. B. (2014) Selective laser melting of an Al(86)Ni(6)Y(4.5)Co(2)La(1.5) metallic glass: processing, microstructure evolution and mechanical properties. Materials Science and Engineering A, 606 370-379. doi:10.1016/j.msea.2014.03.097

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Author Li, X. P.
Kang, C. W.
Huang, H.
Zhang, L. C.
Sercombe, T. B.
Title Selective laser melting of an Al(86)Ni(6)Y(4.5)Co(2)La(1.5) metallic glass: processing, microstructure evolution and mechanical properties
Formatted title
Selective laser melting of an Al86Ni6Y4.5Co2La1.5 metallic glass: Processing, microstructure evolution and mechanical properties
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2014-06-12
Sub-type Article (original research)
DOI 10.1016/j.msea.2014.03.097
Open Access Status
Volume 606
Start page 370
End page 379
Total pages 10
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
In this study, single line scans at different laser powers were carried out using selective laser meting (SLM) equipment on a pre-fabricated porous Al86Ni6Y4.5Co2La1.5 metallic glass (MG) preform. The densification, microstructural evolution, phase transformation and mechanical properties of the scan tracks were systematically investigated. It was found that the morphology of the scan track was influenced by the energy distribution of the laser beam and the heat transfer competition between convection and conduction in the melt pool. Due to the Gaussian distribution of laser energy and heat transfer process, different regions of the scan track experienced different thermal histories, resulting in a gradient microstructure and mechanical properties. Higher laser powers caused higher thermal stresses, which led to the formation of cracks; while low power reduced the strength of the laser track, also inducing cracking. The thermal fluctuation at high laser power produced an inhomogeneous chemical distribution which gave rise to severe crystallization of the MG, despite the high cooling rate. The crystallization occurred both within the heat affected zone (HAZ) and at the edge of melt pool. However, by choosing an appropriate laser power crack-free scan tracks could be produced with no crystallization. This work provides the necessary fundamental understanding that will lead to the fabrication of large-size, crack-free MG with high density, controllable microstructure and mechanical properties using SLM.
Keyword Selective laser melting
Metallic glass
Solidification microstructure
Phase transformation
Mechanical properties
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 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 18 times in Scopus Article | Citations
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Created: Tue, 15 Apr 2014, 14:26:47 EST by Professor Han Huang on behalf of School of Mechanical and Mining Engineering