Selective laser melted AlSi10Mg alloy under melting mode transition:Microstructure evolution, nanomechanical behaviors and tensile properties

Wu, H. and Ren, Y. and Ren, J. and Liang, L. and Li, R. and Fang, Q. and Cai, A. and Shan, Q. and Tian, Y. and Baker, I. (2021) Selective laser melted AlSi10Mg alloy under melting mode transition:Microstructure evolution, nanomechanical behaviors and tensile properties. Journal of Alloys and Compounds, 873. ISSN 0925-8388

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Abstract

The effect of the volumetric energy density (VED) on the keyhole formation, microstructural evolution and associated mechanical properties of AlSi10Mg fabricated by selective laser melting (SLM) has been systematically investigated. The results indicated that three melting modes could be distinguished during the laser melting process, corresponding to different VED ranges, i.e. conduction mode (<50 J mm-3), transitional mode (~50–65 J mm-3), and keyhole mode (>65 J mm-3). A high VED not only produced keyhole defects and hydrogen pores, but also generated two types of molten pool, i.e. a general shallow molten pool (GSP) and a keyhole-induced deep molten pool (KDP). The GSP was mainly consisted of an α-Al matrix, with ~30 µm grains size, and enclosed by a ~500 nm eutectic Si cellular network. The grain size of the KDP was less than 15 µm, and it has both a finer Si network (~200 nm) and nano-scale Si particles. No preferential crystallographic orientation could be observed within the KDP, while a strong texture along<111>orientation was exhibited in the GSP. These were responsible for the different mechanical properties of the SLM parts under different melting modes. The related mechanisms of the GSP and the KDP formation are comprehensively discussed and a correlation between the microstructure and the mechanical properties is also outlined.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Alloys and Compounds
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Alloys and Compounds. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Alloys and Compounds, 873, 2021 DOI: 10.1016/j.jallcom.2021.159823
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
ID Code:
154822
Deposited By:
Deposited On:
11 May 2021 15:50
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jun 2021 09:12