(1) With the increase of MDF passes, the volume fraction of
DRXed grains was remarkably increased, and the average
grain size decreased from 200 lm to 5.4 lm after three
MDF passes, but after that, the average grain size was almost
unchanged, ultrafine grains (UFGs) with an average grain
size of 5.1 lm were uniformly evolved after six MDF passes.
(2) The basal texture was gradually weakened with increasing
the MDF passes, which resulted from cooperative effect of
dynamic recrystallization, dynamic precipitation and the
change direction of the MDF force.
(3) The yield strength, ultimate tensile strength and elongation
to failure were enhanced with increasing the MDF passes.
After six passes of MDF processing, the yield strength,
ultimate tensile strength and elongation to fracture of the
alloy reached to 320 MPa, 253 MPa and 7.5%, where were
1.9 times, 1.6 times and 15 times as the as-homogenized
Mg–Gd–Y–Nd–Zr billet, respectively.