Twinning deformation in magnesium compressed along the C-axis

Abstract Deformation twinnings in magnesium activated on the c-axis compression were investigated by light and electron transmission microscopies. Well-known twin forms of {10 1 3} and {30 3 4} habit planes were confirmed again, but {10 1 3} twins were frequently observed to occur in groups along {30 3 4} or grow from {10 1 3} habit to {30 3 4} habit. Transmission electron microscopic observations revealed that the well-developed {30 3 4} habit twin has the same orientation relationship with the parent crystal as the {10 1 3} twin. From these observations, it is concluded that the well-developed {30 3 4} habit twin are the {10 1 3} twins developed along {30 3 4} planes. A possible mechanism of the habit plane change is described and the relation between the twin and the compression band is discussed.