Nanocrystalline structure fabricated by cryogenic temperature rolling of AA 2099 aluminum alloy

•Nanocrystalline structure was produced by cryogenic rolling in an AA 2099 alloy.•Ultrafine structure was observed inside or near the regulate-oriented shear bands.•Severely deformation and related temperature increase leads to the grain refinement.•Shear banding was promoted due to strong work hardening at cryogenic temperature.