Abnormally high residual dislocation density in pure aluminum after Al/Ti/Al laminate annealing for seven days

Abstract

We report an abnormally high residual dislocation density in aluminium in an Al/Ti/Al laminate annealed at 873 K for seven days. The residual dislocation density reaches 7.5 × 10¹⁴ m⁻², higher than that in aluminum after severe plastic deformation processes such as accumulative roll bonding and high-pressure torsion. It is proposed that the high residual dislocation density may result from obstruction of the movement of TiAl₃ nanoparticles by the grain boundary and Ti atoms conglomerating at vacancies distributed in the aluminium matrix at a high temperature for a sufficient time to allow a relatively stable crystal.

Keywords:

• dislocation
• aluminium
• void
• composite laminate
• annealing
• plastic deformation

Additional information

Funding

Funding. The authors gratefully acknowledge the financial support from the Vice-Chancellor’s Fellowship Grant and URC small grant at the University of Wollongong and from the National Natural Science Foundation of China through [grant number 5105071].