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Memorias de investigación
Research Publications in journals:
Origin of the reversed yield asymmetry in Mg-rare earth alloys at high temperature
Year:2015
Research Areas
  • Civil engineering and architecture
Information
Abstract
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.
International
Si
JCR
Si
Title
Acta Materialia
ISBN
1359-6454
Impact factor JCR
3,941
Impact info
Datos JCR del año 2012
Volume
Journal number
From page
265
To page
276
Month
SIN MES
Ranking
Participants
  • 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 Galvez Diaz-Rubio (UPM)
  • Autor: O.A. Ruano (Department of Physical Metallurgy, CENIM-CSIC)
  • Autor: Maria Teresa Pérez Prado (IMDEA Materials Institute)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Ciencia de Materiales
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
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