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Nanoindentation Shows Uniform Local Mechanical Properties Across Melt Pools And Layers Produced By Selective Laser Melting Of AlSi 10Mg Alloy

Nanoindentation Shows Uniform Local Mechanical Properties Across Melt Pools And Layers Produced By Selective Laser Melting Of AlSi 10Mg Alloy

Nicola M. Everitt*, Nesma T. Aboulkhair, Ian Maskery, Chris J. Tuck, Ian Ashcroft

Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, University Park, Nottingham NG2 7RD, United Kingdom 

Adv. Mater. Lett., 2016, 7 (1), pp 13-16

DOI: 10.5185/amlett.2016.6171

Publication Date (Web): Dec 22, 2015

E-mail: nicola.everitt@nottingham.ac.uk

Abstract


Single track and single layer AlSi 10Mg has been produced by selective laser melting (SLM) of alloy powder on an AlSi12 cast substrate. The SLM technique produced a cellular-dendritic ultra-fined grained microstructure. Chemical composition mapping and nanoindentation showed higher hardness in the SLM material compared to its cast counterpart.  Importantly, although there was some increase of grain size at the edge of melt pools, nanoindentation showed that the hardness (i.e. yield strength) of the material was uniform across overlapping tracks. This is attributed to the very fine grain size and homogeneous distribution of Si throughout the SLM material. 

Keywords

Nanoindentation, additive manufacturing, aluminium alloy.

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