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Microstructure and strength of ZA-27-based composites reinforced with Al2O3particles

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
57
Issue
11
Identifiers
DOI: 10.1016/s0167-577x(02)01052-2
Keywords
  • Compocasting
  • Semi-Solid Melt
  • Al2O3Strengthener
  • Particle Size
  • Compression Strength

Abstract

Abstract Two Zn–27Al–3Cu–3Al 2O 3 (wt.%) composites with different particle size (approximately 12 and 250 μm) of Al 2O 3 powder were produced by a compocasting process, i.e. Al 2O 3 particles were continuously added to a semi-solid melt which was vigorously stirred. Comparative investigations of microstructure [scanning electron microscope (SEM), energy dispersive spectrometry (EDS)] and compression strength (from room temperature to 170 °C) of as-cast alloy and composites were carried out. Composites exhibit higher strength than the as-cast alloy. The strengthening effect of smaller Al 2O 3 particles is more pronounced than the effect of much larger particles.

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