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Plastic flow properties and microstructural evolution in an ultrafine-grained Al-Mg-Si alloy at elevated temperatures
journal contributionposted on 2009-12-01, 00:00 authored by B Kashyap, Peter HodgsonPeter Hodgson, Y Estrin, Ilana Timokhina, Matthew BarnettMatthew Barnett, Ilchat Sabirov
An AA6082 alloy was subjected to eight passes of equal channel angular pressing at 100 °C, resulting in an ultrafine grain size of 0.2 to 0.4 µm. The tensile deformation behavior of the material was studied over the temperature range of 100 °C to 350 °C and strain rate range of 10¯4 to 10¯1 s¯1. The evolution of microstructure under tensile deformation was investigated by analyzing both the deformation relief on the specimen surface and the dislocation structure. While extensive microshear banding was found at the lower temperatures of 100 °C to 150 °C, deformation at higher temperatures was characterized by cooperative grain boundary sliding and the development of a bimodal microstructure. Dislocation glide was identified as the main deformation mechanism within coarse grains, whereas no dislocation activity was apparent in the ultrafine grains.
JournalMetallurgical and materials transactions A – physical metallurgy and materials science
Pagination3294 - 3303
LocationNew York, N.Y.
Publication classificationC1 Refereed article in a scholarly journal; C Journal article
Copyright notice2009, Springer
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ultrafine-grained alloymicrostructural evolutionheat treatmentScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceSTRAIN-RATE SUPERPLASTICITYHIGH-PRESSURE TORSIONNANOCRYSTALLINE METALSALUMINUM-ALLOYSOLID-SOLUTIONDEFORMATION-BEHAVIORMECHANICAL-BEHAVIORCREEPCOMPOSITESPRECIPITATION