Solute segregation assisted nanocrystallization of a cold-rolled Mg–Ag alloy during annealing
Scripta Materialia, 2020•Elsevier
Refining grains to nanoscale has been a challenge, especially for materials with low-melting
points and poor ductility, such as Mg alloys. Here we report a novel mechanism of
nanocrystallization assisted by solute segregation, by which a nanocrystalline Mg-Ag alloy
was produced by moderate cold rolling (∼ 55% strain) followed by low-temperature
annealing. Specifically, during cold rolling non-basal< c+ a> dislocations were activated to
form dislocation cells walls, which were pinned by Ag segregation, and transformed into …
points and poor ductility, such as Mg alloys. Here we report a novel mechanism of
nanocrystallization assisted by solute segregation, by which a nanocrystalline Mg-Ag alloy
was produced by moderate cold rolling (∼ 55% strain) followed by low-temperature
annealing. Specifically, during cold rolling non-basal< c+ a> dislocations were activated to
form dislocation cells walls, which were pinned by Ag segregation, and transformed into …
Abstract
Refining grains to nanoscale has been a challenge, especially for materials with low-melting points and poor ductility, such as Mg alloys. Here we report a novel mechanism of nanocrystallization assisted by solute segregation, by which a nanocrystalline Mg-Ag alloy was produced by moderate cold rolling (∼55% strain) followed by low-temperature annealing. Specifically, during cold rolling non-basal <c + a> dislocations were activated to form dislocation cells walls, which were pinned by Ag segregation, and transformed into boundaries of nanocrystalline grains during annealing.
Elsevier
