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Marya, Manuel
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article
Microstructures and Mechanical Properties of an Artificially-Aged Al-Mg-Ga Alloy
Abstract
<jats:p>The microstructures of an Al-Mg-Ga cast alloy have been investigated to fundamentally understand its hardening response during heat-treatment. In as-cast, solution heat-treated, and aged conditions, the alloy is characterized by having a variety of metallurgical phases with unique morphologies and chemical compositions. Micro-hardness indentations subsequent to artificial aging between 50°C and 300°C revealed that the investigated Al-Mg-Ga alloy is capable of Vickers hardness values in excess of 180, therefore demonstrating a remarkably elevated age hardening behavior relative to conventional aluminum alloys. SEM and TEM observations, coupled with DSC analysis with several aging conditions, revealed that hardening is induced by submicron platelet precipitates having the length, width, and density that depend largely on the alloy aging conditions.</jats:p>