The influence of iron impurities on the compression behaviour of Al-2.24Mg-2.09Li alloy
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Published:2020
Issue:3
Volume:56
Page:425-433
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ISSN:1450-5339
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Container-title:Journal of Mining and Metallurgy, Section B: Metallurgy
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language:en
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Short-container-title:J min metall B Metall
Author:
Kozina F.1,
Zovko-Brodarac Z.1,
Petric M.2,
Penko A.2
Affiliation:
1. University of Zagreb Faculty of Metallurgy, Sisak, Croatia
2. University of Ljubljana Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia
Abstract
As a major impurity element in aluminium-lithium (Al-Li) alloys, iron (Fe) reduces formability, fracture toughness, and fatigue resistance by solidifying into Al6Fe and Al3Fe particles. The research was performed in order to estimate the influence of Fe impurities on the compression behaviour of Al-2.24Mg-2.09Li alloy. The investigation was performed on the samples in as cast and solution hardened condition. The solution hardening was applied to improve the mechanical properties by dissolving intermetallic particles and enriching ?Al matrix with Mg. However, the higher strength properties and temperature increase during the compression testing were observed in as cast condition. Microstructural investigation revealed significant differences in microstructure changes between the samples in as cast and solution hardened condition. In as cast sample the barrelling effect led to the unequal deformation and surface texture development. The eutectic Al3Fe particles located in the ?Al interdendritic areas did not significantly impact microstructure changes. Although the solution hardening led to enrichment of ?Al matrix with Mg and Fe, the Al3Fe particles were not dissolved. The coarse morphology of Al3Fe particles and location at the grain boundaries of ?Al grains contributed to low energy intergranular fracture. The fracture nucleation and propagation across the grain boundaries resulted in lower strength values.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology
Cited by
2 articles.
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