Machinery Multi-Grinding of the surface（MMGS）device was used to perform two passes of plastic deformation on the plate of 2024 Al alloys

and XRD

the mechanical property test

TEM and HRTEM of the grinned material were performed.The results show that MMGS is an effective plastic deformation method for the commercial 2024 aluminum alloys.Yield strength of the grinned samples can reach 475 MPa and the elongation can reach 15%

which are attributed to a large amount of dislocations and grains refinement inside the sample.The MMGS samples and the T351 state samples are analyzed using the work hardening rate.The work hardening rate of the T351 state samples is much higher than that of the MMGS samples in a large range of the whole strain after the ture strain more than 0.018

besides the cracks are generated when the coarse S phase were suffered the strong plastic deformation

which ultimately leads to the elongation of the MMGS samples slightly lower than that of the T351 state samples.