Relationship between microstructure and deformation behaviour during dynamic compression in Ti–3Al–5Mo–5V alloy

Abstract

The relationship between microstructure and deformation and damage behaviour during dynamic compression in Ti-3Al-5Mo-5V alloy has been studied using several experimental techniques, including optical microscopy, scanning electron microscopy and microhardness measurements. It was found that the deformation behaviour during dynamic compression was closely related to deformation parameters. After dynamic deformation, the deformation shear band that formed in the titanium alloy had microhardness similar to that of the matrix. However, the microhardness of the white shear band was much higher than the matrix microhardness. The effects of deformation parameters, including deformation rate and deformation degree, on deformation localisation were investigated. Based on the results from the present work, the microstructure and deformation processing parameters can be optimised. In addition, treatment methods after dynamic compression were explored to restore alloy properties. Using post-deformation heat treatment, the microstructure and property inhomogeneity caused by shear bands could be largely removed.

Behavior and modeling of high temperature deformation of an α+β titanium alloy

“…During the study of microstructure, shear bands observed in Refs. [16,25] were not obviously found in our paper. Several facts can account for this difference.…”

“…Several facts can account for this difference. Dynamic compression experiments were conducted at much higher temperature (above 950 • C) and smaller deformation rate (0.001-1 s −1 ) in our study compared with the low room temperature and high deformation rate (100-500 mm/s) in [16,25]. The deformation heating resulting from low thermal conductivity of titanium and high compression rate contributed to this kind of localized deformation bands [18].…”

On the stress-state dependent plasticity of brittle metallic glasses: Experiment, theory and simulation

“…Up to now, many investigations mainly focused on this flow behavior by experiment, theory and simulation methods as well as the shear band models in alloys [33,[37][38][39][40][41][42]. Although previous approaches provided several valid models to describe the flow behavior of metallic glass or shear band model, the stressdependent plasticity has rarely been analyzed systematically [22,23].…”

Microscopy of heat treated titanium alloy BT16

“…The effects of heat treatment temperature and time on the phase formation of the plate structure in the BT16 titanium alloy are studied. Recently, the relationship between microstructure and deformation behaviour during dynamic compression in this alloy has been studied, 19 but it does not contain the detailed measurements of microstructural changes induced by heat treatment.…”