Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Thermostastitical modelling of deformation twinning in HCP metals
AU - Galindo-Nava, E. I.
AU - Rivera-Díaz-Del-Castillo, P. E.J.
PY - 2014/4
Y1 - 2014/4
N2 - Deformation twinning in HCP metals is described by a novel thermostatistical approach. Thermodynamic descriptions for the critical conditions for twin nucleation and growth are derived. These are obtained by accounting for the competition between the strain energy in the material from local stress concentrations and dislocation slip. Central to this theory is the introduction of a statistical entropy term that accounts for the energetically favourable dislocation migration paths, which determine the dynamic recovery, twin nucleation and growth rates. Deformation by dislocation slip, at strains before twinning occurs, is described by theory previously derived for FCC metals and now applied to HCP materials without additional considerations. A dislocation generation term accounting for twin propagation is added to the evolution equation. Such term becomes active once a critical strain for twin nucleation is reached. Only physical parameters are employed as input. The new theory is successful in describing work hardening and twin volume fraction evolution of Ti, Zr, Mg and Mg-based alloys for various temperature and orientation conditions.
AB - Deformation twinning in HCP metals is described by a novel thermostatistical approach. Thermodynamic descriptions for the critical conditions for twin nucleation and growth are derived. These are obtained by accounting for the competition between the strain energy in the material from local stress concentrations and dislocation slip. Central to this theory is the introduction of a statistical entropy term that accounts for the energetically favourable dislocation migration paths, which determine the dynamic recovery, twin nucleation and growth rates. Deformation by dislocation slip, at strains before twinning occurs, is described by theory previously derived for FCC metals and now applied to HCP materials without additional considerations. A dislocation generation term accounting for twin propagation is added to the evolution equation. Such term becomes active once a critical strain for twin nucleation is reached. Only physical parameters are employed as input. The new theory is successful in describing work hardening and twin volume fraction evolution of Ti, Zr, Mg and Mg-based alloys for various temperature and orientation conditions.
KW - A. dislocations
KW - A. strengthening mechanisms
KW - A. twinning
KW - B. metallic material
KW - Statistical thermodynamics
U2 - 10.1016/j.ijplas.2013.09.006
DO - 10.1016/j.ijplas.2013.09.006
M3 - Journal article
AN - SCOPUS:84894034168
VL - 55
SP - 25
EP - 42
JO - International Journal of Plasticity
JF - International Journal of Plasticity
SN - 0749-6419
ER -