Original scientific paper

Effect of cooling rate on the microstructure of an Al₉₄Mn₂Be₂Cu₂ alloy

T. Bončina ; Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia
B. Markoli ; Faculty of Natural Sciences and Engineering, University of Ljubljana, Ljubljana, Slovenia
F. Zupanič ; Faculty of Mechanical Engineering, University of Maribor, Maribor, Slovenia

Abstract

In this study the effect of the cooling rate on the microstructure of Al₉₄Mn₂Be₂Cu₂ alloy was investigated. The vacuum induction melted and cast alloy was exposed to different cooling rates. The slowest cooling rate was achieved by the DSC (10 K•min-1), the moderate cooling rate succeeded by casting in the copper mould (≈1 000 K•s-1) and the rapid solidification was performed by melt spinning (up to 106 K•s-1). The microstructure of the DSC-sample consisted of α-Al matrix, and several intermetallics: τ₁-Al₂₉Mn₆Cu₄, Al₄Mn, θ-Al₂Cu and Be₄Al(Mn,Cu). The microstructures of the alloy at moderate and rapid cooling consisted of the α-Al matrix, i-phase and θ-Al₂Cu. Particles of i-phase and θ-Al₂Cu were much smaller and more uniformly distributed in melt-spun ribbons.

Keywords

Al-alloy; metallography; microstructure; cooling rate; solidification

Hrčak ID:

74837

URI

https://hrcak.srce.hr/74837

Publication date:

2.4.2012.

Article data in other languages: croatian

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