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Large elongations in WE54 magnesium alloy by solute-drag creep controlling the deformation behavior

AuthorsRuano, Oscar Antonio; Alvarez-Leal, M.; Orozco-Caballero, A.; Carreño, Fernando
KeywordsMagnesium WE54
High temperature deformation mechanisms
Solute drag creep
Issue DateJul-2020
CitationMaterial Science and Engineering A 791: 139757 (2020)
AbstractSolute-drag creep is a diffusion-controlled process that may govern deformation in coarse-grained materials with solute atoms in solution. Elongation-to-failure tensile tests were conducted in a WE54 alloy containing solutes of Y and Nd in the range 25–450 °C. Elongations of more than 150% were observed at high temperatures and a maximum elongation to failure of 312% was determined at 450 °C and 10-2 s-1. Microstructural observations show elongated grains and the presence of dislocation bands after deformation under these conditions. Strain-rate-change tests reveal a range at high temperatures showing low stress exponents. Since grain boundary sliding was discarded as a possible controlling mechanism, the observed low stress exponents, high elongations and elongated grains are attributed to solute-drag creep as the principal deformation mechanism.
Publisher version (URL)https://doi.org/10.1016/j.msea.2020.139757
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