The effect of interfaces on mechanical properties is considered. Elastic and plastic compatibilities at boundaries are treated. Specific influences at both low and high temperatures are discussed, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries.

The influence of grain boundaries on mechanical properties

Diffusional creep and diffusionally accommodated grain rearrangement

Grain boundary sliding and deformation mechanism maps

Deformation enhanced grain growth in a superplastic Sn-1% Bi alloy

Superplastic behaviour in torsion was first reported by Saveur [2] Pearson [3] first presented detailed observations of tensile superplasticity.

Superplasticity: A review

The microstructural changes that occur during superplastic deformation of the Al–Cu eutectic alloy are considered. It is shown that considerable modification occurs to the shapes and distribution of the inter-metallic CuAl2 particles during deformation. This effect may be understood in terms of sliding and diffusion-controlled shape changes associated with grain boundaries within the intermetallic. The roles of interface sliding and of diffusion creep in superplasticity are discussed.

M. J. Stowell

Papers

Structural Changes during Superplastic Deformation of the Al–Cu Eutectic Alloy