Metallurgy, Vol. 51 No. 2, 2012.
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
Publication date:
2.4.2012.
Visits: 1.569 *