Determination of the single-phase constitutive relations of α/β dual phase TC6 titanium alloy

Abstract

The constitutive relations of α and β phases in a TC6 titanium alloy were determined by implementing a two-phase elastic-plastic self-consistent (EPSC) framework combined with the evolution of lattice strains; these strains were obtained via in-situ tensile loading synchrotron-based x-ray diffraction experiments. It was found that the {200} β reflection has the lowest stiffness and load partitions prior to the α phase during the elastic loading stage in this alloy. The simulated parameters including the diffraction elastic constant and initial yield stress of lattice reflections exhibited satisfactory correspondence with the experimental results. Further analysis of the characteristics of the Schmid Factor (SF) distributions of the main slip systems revealed that the elastic-plastic transition process in the α phase occurs over a prolonged period. In contrast, the β phase undergoes a transient process owing to its relatively more concentrated SF frequency distributions, than those of the α phase. In addition, the fitted stress-strain curve of each phase was compared with

In Situ Tensile Deformation and Mechanical Properties of α Platelets TC21 Alloy

“…Tan et al [ 12 ] and Holden et al [ 31 ] have argued that the hardness of micron-scale β phase was around three times higher than the micron-scale α phase. Shi et al [ 32 ] have observed that the stiffness of β phase was higher than α phase. Ankem et al [ 33 ] have demonstrated that the final strain of both α and β phases should be equal.…”

Analysis of Phase-Specific Strain Pole Figures for Duplex Steels under Elasto-Plastic Uniaxial Tension—Experiment vs. EPSC Modelling

“…When using EPSC methods on two-or multiphase materials with high fractions of contributing phases, the question of the interaction of the two or more phases with each other has to be taken into account. It is known from the literature (e.g., [52][53][54][55][56]) that this should be best implemented by considering the changing stiffnesses due to the interaction of the two phases or the elasto-plastic stiffness modulus.…”