Electron backscatter diffraction (EBSD) was applied to investigate the superplastic behavior of a fine-grain Al-Mg-Li alloy. It found that microstructural changes were noticeably influenced by occurrence continuous dynamic recrystallization. This mechanism involved transverse subdivision pre-elongated grains which eventually transformed into chains nearly-equiaxed grains. A body experimental ob...

A physical model of high-strain rate deformation metallic materials has been developed to describe the evolution microstructure during process. The is based on representations mechanisms grain boundary sliding, strain-induced growth and dynamic fragmentation coarse grains in framework theory nonequilibrium boundaries. These are modified for description high-speed flow supplemented by a recrysta...

It is shown that thermomechanical treatment (TMT) of the EK61 superalloy with a strain rate (ε∙) 10−3 s−1 and gradual decrease in temperature from (0.92 – 0.65)Tδ leads to transformation initial coarse-grained structure into an ultrafine-grained (UFG) mixed type structure. Such UFG microstructure consists γ-phase grains δ-phase particles 0.3 μm size relatively large up 2 size. The having such e...

Low-temperature superplasticity (LTS) is crucial to reduce manufacturing cost and enhance the applications of superplastic forming. It well known that grain refinement key point decrease temperature at which attained. Therefore, ultrafine-grained (UFG) materials have become attractive for achieving LTS. Severe plastic deformation (SPD) techniques provide abnormal refinement, thus they been used...