Affiliation:
1. Institute of Nuclear Sciences “Vinča”, University of Belgrade, Belgrade, Serbia
Abstract
A comparison was made between layer-by-layer laser melting (LM) of two types
of feedstock powders: (1) elemental powder blend and (2) mechanically
alloyed powder. LM was done by Nd:YAG laser at 1064 nm (max. average power
100 W) in argon ambience. Samples synthesized were Cu-Ti-TiB2 rectangular
tracks (20?6?1 mm), and input parameters of the process: powder layer
thickness 100-250 ?m, hatch spacing 1 mm, pulse length 4 ms, energy 4 J,
pulse repetition rate 20 Hz. Part of the samples was heat-treated in argon
at 900 ?C, 10 h. Structural characterization of the samples was done using
light microscope and scanning electron microscope (SEM). Chemical analysis
of the as-obtained laser melted samples was done by inductively coupled
plasma-atomic emission spectrometry (ICP-AES). It was established that the
microstructure of LM samples was comprised of Cu-Ti and Cu-B solid regions,
and in situ formed microparticles of primary TiB2. Only after
high-temperature thermal treatment has the secondary TiB2 occurred. Tensile
tests showed much higher strengthening in heat-treated samples with
mechanically alloyed powder as starting material, where the formation of
secondary TiB2 nanoparticles was considerable.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites
Cited by
3 articles.
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