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Artículos en revistas:
Origin of the reversed yield asymmetry in Mg-rare earth alloys at high temperature
Año:2015
Áreas de investigación
  • Ingeniería civil y arquitectura
Datos
Descripción
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 slip, which is the dominat deformation mechanism at high temperatures. It is proposed, furthermore, that the asymmetry is enhanced at quasi-static strian rates by the stronger interaction of dislocations with the diffusing solute atoms and with particles in compression than in tension.
Internacional
Si
JCR del ISI
Si
Título de la revista
Acta Materialia
ISSN
1359-6454
Factor de impacto JCR
3,941
Información de impacto
Datos JCR del año 2012
Volumen
DOI
Número de revista
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Participantes
  • Autor: Paloma Hidalgo Manrique (IMDEA Materials Institute)
  • Autor: Vicente Herrera Solaz (UPM)
  • Autor: Javier Segurado Escudero (UPM)
  • Autor: Fco. Javier Llorca Martinez (UPM)
  • Autor: Francisco Rafael Galvez Diaz-Rubio (UPM)
  • Autor: O.A. Ruano (Department of Physical Metallurgy, CENIM-CSIC)
  • Autor: Maria Teresa Pérez Prado (IMDEA Materials Institute)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: CENTRO INVEST. MATERIALES ESTRUCTURALES (CIME)
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