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2015 | 128 | 4 | 602-605
Article title

Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy

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Abstracts
EN
The microstructure of an aluminum alloy containing 53 wt% Zn, 2.1 wt% Mg and 1.3 wt% Cu as main alloying elements has been studied with the focus on the precipitation behavior during the spark plasma sintering process. The starting material was an atomized Al-Zn-Mg-Cu powder with the particle size below 50 μm. The particles showed a solidification microstructure from cellular to columnar or equiaxed dendritic morphology with a large fraction of the alloying elements segregated in form of intermetallic phases, mainly (Zn,Al,Cu)₄₉Mg₃₂ and Mg₂(Zn,Al,Cu)₁₁, at the cell and dendrite boundaries. The microstructure of the sintered specimens followed the microstructure of the initial powder. However, Mg(Zn,Al,Cu)₂ precipitates evolve at the expense of the initial precipitate phases. The precipitates which were initially continuously distributed along the intercellular and interdendritic boundaries form discrete chain-like structures in the sintered samples. Additionally, fine precipitates created during the sintering process evolve at the new low-angle boundaries. The large fraction of precipitates at the grain boundaries and especially at the former particle boundaries could not be solved into the matrix applying a usual solid solution heat treatment. A bending test reveals low ductility and strength. The mechanical properties suffer from the precipitates at former particle boundaries leading to fracture after an outer fiber tensile strain of 3.8%.
Keywords
Contributors
author
  • Institute of Materials Science, TU Bergakademie Freiberg, 09599 Freiberg, Germany
author
  • Institute of Materials Science, TU Bergakademie Freiberg, 09599 Freiberg, Germany
author
  • Charles University in Prague, Department of Physics of Materials, Prague, Czech Republic
author
  • Charles University in Prague, Department of Physics of Materials, Prague, Czech Republic
author
  • Academy of Sciences of the Czech Republic, Institute of Plasma Physics, Prague, Czech Republic
author
  • Institute of Materials Science, TU Bergakademie Freiberg, 09599 Freiberg, Germany
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv128n432kz
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