Selective laser melting of alumina: A single track study

Fan, Zhiqi, Lu, Mingyuan and Huang, Han (2018) Selective laser melting of alumina: A single track study. Ceramics International, 44 8: 9484-9493. doi:10.1016/j.ceramint.2018.02.166


Author Fan, Zhiqi
Lu, Mingyuan
Huang, Han
Title Selective laser melting of alumina: A single track study
Journal name Ceramics International   Check publisher's open access policy
ISSN 0272-8842
1873-3956
Publication date 2018-02-21
Sub-type Article (original research)
DOI 10.1016/j.ceramint.2018.02.166
Open Access Status Not yet assessed
Volume 44
Issue 8
Start page 9484
End page 9493
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
2503 Ceramics and Composites
1508 Process Chemistry and Technology
2508 Surfaces, Coatings and Films
2505 Materials Chemistry
Abstract Ceramics-based additive manufacturing is a complex process and the solidification mechanism and microstructural evolution are currently not fully understood. In this work, AlO single tracks were formed using a customised selective laser melting (SLM) system equipped with a high power diode laser. The effects of laser energy density (LED) on geometry, microstructure and micro-mechanical properties of AlO tracks were investigated. To better understand the solidification mechanism, a transient three-dimensional thermal model was developed for predicting the thermal behaviour of the melt pool. The results indicated the use of high LED gave rise to decreased viscosity and surface tension of the molten alumina and led to localized melting of the substrate. Both, in turn, enabled the formation of a continuous solidified track. The solidified tracks were primarily composed of columnar dendrite. When relatively high LED (≥ 25.7 kJ/m) was applied, equiaxed dendrite appeared along the central line near the track surface. The size of dendritic grains decreased with the decreased LED, attributed to the increased cooling rate at solidification interface. The micro-hardness of the solidified track was found to be inversely proportional to the grain size owning to grain boundary strengthening effect.
Keyword Alumina
Laser energy density
Selective laser melting
Solidification
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
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Created: Fri, 13 Apr 2018, 09:08:48 EST