Crystal plasticity finite element study of tensile behavior of two-phase titanium alloy Ti-6Al-4V
The influence of α/β volume fraction and grain size on the tensile mechanical properties of Ti-6Al-4V dual-phase titanium alloy was investigated in this study using the crystal plasticity finite ele-ment method.The contribution of different slip systems to plastic deformation was evaluated quantitat-ively by slip relative fraction.The results demonstrate that the stress-strain distribution during the tensile deformation of Ti-6Al-4V titanium alloy is non-uniform.The stress is primarily concentrated on the β phase grain and grain boundary,while the strain is concentrated on the α phase grain.Increasing the volume fraction of β phase leads to a larger stress concentration area,easier generation of strain concen-tration at the triple-junction of grain boundaries,and a significant increase in contribution from the β phase{110}slip system to the plasticity deformation.Increasing α,β or two-phase grain size results in decreased stress-strain curve in the plastic region,where initial deformation is predominantly governed by prismatic slip system while pyramidal〈c+a〉slip system contribute slightly less.An increase in α-phase grain size leads to a decrease in the activity of pyramidal〈c+a〉slip system,resulting in reduced stress values in the plastic region.Increasing the β-phase grain size results in a reduction of stress dur-ing the plastic stage,which is attributed to the decreased activity of{110}slip system within the β-phase.Simultaneously increasing the grain size of both the α and β phases will affect the activation frac-tion of prismatic and{110}slip systems.The reduction in stress is associated with the significant de-crease in the number of interfaces.
Ti-6Al-4Vtensile behaviorscrystal plasticitystress-strainslip systemfinite element method
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