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Phases in the Al-Corner of the Al–Mn–Be System

Published online by Cambridge University Press:  18 June 2013

Franc Zupanič ,
Boštjan Markoli ,
Iztok Naglič ,
Tobias Weingärtner ,
Anton Meden  and
Tonica Bončina
Franc Zupanič*
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI-2000 Maribor, Slovenia
Boštjan Markoli
Affiliation:
Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva 12, SI-1000, Slovenia
Iztok Naglič
Affiliation:
Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva 12, SI-1000, Slovenia
Tobias Weingärtner
Affiliation:
Institute for Applied Materials – Applied Materials Physics (IAM-AWP), Karslruhe Institute of Technology (KIT), Herrmann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Anton Meden
Affiliation:
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, SI-1000 Ljubljana, Slovenia
Tonica Bončina
Affiliation:
Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, SI-2000 Maribor, Slovenia
*
*Corresponding author. E-mail: [email protected]
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Abstract

This work studied the phases in the Al corner of the Al–Mn–Be phase diagram in the as-cast state and heat-treated conditions. Metallographic investigations, X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy were used for identifying the phases. The Be contents in the identified phases were precisely determined using Auger electron spectroscopy. The results indicated that Al6Mn does not dissolve Be, whilst λ-Al4Mn dissolves up to 7 at.% Be. The average composition of the T phase, which is normally designated as Al15Mn3Be2, was 72 at.% Al, 19 at.% Mn, and 9 at.% Be. The phase with the nominal composition Be4AlMn contained more Al than Mn. The atomic ratio Al:Mn was between 1.3:1 and 2:1. The hexagonal Be-rich phase did not dissolve any Al and Mn. The icosahedral quasicrystalline (IQC) phase contained up to 45 at.% Be. The compositions of T phase, λ–Al4Mn, IQC, and Be4AlMn may vary, however, the ratio (Al + Be):Mn remained constant, and was close either to four or six indicating substitution of Al atoms with Be atoms in these phases.

Keywords

intermetallic phasesaluminummanganeseberylliumXRDAES
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 5 , October 2013 , pp. 1308 - 1316
Copyright
Copyright © Microscopy Society of America 2013 

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