Papers by Author: F.E. Cui

Abstract: Basal slip and tension twinning are dominant deformation mechanisms of polycrystalline magnesium at low temperature. However, fracture originates mainly from compression twins or shear bands developed from compression twins. This work compared firstly the morphological difference of two types of twins. Then, the dependence of different deformation mechanisms on initial orientations is computed by Schmid factor analysis and compared with measured matrix orientations of twins. Finally, orientation relationships of compression twins with matrices are determined using EBSD technique and compared with theoretical value.

Abstract: Cellular precipitation is reduced greatly by deformation at all ageing temperatures. Precipitates within twins are often nodular and sluggish to grow, whereas dislocations created by basal slip in matrices promote fast growth of plate-like precipitates. Recrystallization was observed concurrent with precipitation above 310°C. Effective nucleation sites for recrystallization are positions connecting twins and grain boundaries or the intersections of twin variants.