The theory of structural superplasticity—IV. Cavitation during superplastic deformation

Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: fcc versus bcc metals

“…As pointed out in [59,61], in the case of high temperature and low stress (creep), the stress and strain rate have a linear relation (m is thus unity). For high stresses, the Arrhennius relation of Eq.…”

“…(13). For nc fcc metals, for low stresses an increased m is also expected from a constitutive response function [59][60][61][62] such aṡ…”

Texture and mechanical properties of superplastically deformed magnesium alloy rod

“…A decrease in strain rate during high-temperature deformation has both positive and negative effects on the reduction in strength at room temperature. During the superplastic deformation, texture randomization is assumed to be more significant with decreasing strain rate owing to an increasing contribution of GBS to the deformation [29], while the amount of cavity decreases with decreasing applied stress or strain rate [30][31][32][33]. The experimental trend suggests that texture randomization prevails over cavitation in strength reduction.…”

Processing‐Dependent Microstructural Factors Affecting Cavitation Damage and Tensile Ductility in a Superplastic Alumina Dispersed with Zirconia

“…In superplastic ceramics, cavity damage can be accumulated not only by the formation and growth of new cavities, but also by the growth of residual defects. 33 The latter has not been incorporated in most damage-accumulation models for metals 37,44 and has drawn little notice in superplastic ceramics. 4,5,[7][8][9][10][11] However, relative densities of around 99% noted for superplastic ceramics 9,10,15,20,21,24,25 suggest that there are a large number of preexistent cavity nuclei that may grow with the newly formed ones and contribute to failure.…”