On stress relaxation based on dislocation dynamics

The uniform distribution of carbon nanotubes (CNTs) can lead to severe grain refinement to ultrafine-grained (UFG) regime of Al matrix, resulting in low strain hardening ability, thereby low ductility in CNT/Al composites. To evade this dilemma, CNT/Al–Mg composites with bimodal microstructures were prepared by a powder assembly process in this study. The effects of weight/volume fraction of coarse grains on microstructure evolution, plastic...