High density stacking faults of {10(1)over-bar1} compression twin in magnesium alloys

{10 (1) over bar1 } compression twins with high density stacking faults were studied at atomic scale using Cs-correction transmission electron microscopy. On one side of the {10 (1) over bar1} twin boundary, there were many steps arranged alternately with the coherent twin boundaries. Most of the steps were linked with stacking faults inside twins. Burgers vector of twinning dislocations and the mismatch strain at steps were characterized. Due to the compressive mismatch strain at steps, the high density stacking faults inside twins were formed at twin tips during twinning process. The localized strain at the steps would be related to the crack nucleation in magnesium alloys. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.