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Descripción
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The mechanical behaviour in tension and compression of an extruded Mg-1 wt.% Mn-1 wt.% Nd (MN11) alloy was studied along the extrusion direction in the temperature range -175ºC to 300ºC at both quasi-static and dynamic strain rates. Microstructural analysis revealed that the as-extruded bar presents a recrystallized microstructure and a weak texture that remain stable in the whole temperature range. A remarkable reversed yield stress asymmetry was observed above 150ºC, with the compressive yield stress being sigificantly higher than the tensile yield stress. The origin of this anomalous reversed yield stress asymmetry, which to date remains unknown, was investigated through the anlysis of the macro and microtexture development during deformation, as well as by means of crystal plasticity finite element simulations of a representative volume element of the polycrystal. The critical resolved shear stresses of slip and twining for simulated single crystals were obtained as a fuction of the temperature by means of an inverse optimisation strategy. Experimental and simulation results suggest that the reversed yield asymmetry may be primarily attributed to the non-Schmid behaviour of pyramidal |
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Internacional
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JCR del ISI
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Título de la revista
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Acta Materialia |
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ISSN
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1359-6454 |
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Factor de impacto JCR
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3,941 |
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Información de impacto
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Datos JCR del año 2012 |
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Volumen
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DOI
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Número de revista
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