Microstructure and formability at room temperature of as-annealing Mg-xZn-0.5Er alloy sheets

The magnesium alloy sheet has a great industrial application value, but the further application has been restricted because of its inferior formability. Aim to this problem, the Mg-xZn-0.5Er alloy sheets were produced and investigated in the present investigation. The effects of texture/second phase transformation after annealing treatment on microstructure and properties were studied. The results show that the coarse second phase promotes the occurrence of dynamic recrystallization (DRX), resulting in refinement of deformed microstructure. Also, this coarse phase also activates the static recrystallization (SRX), and both the microstructure and the texture are further modified, but the strengths of these sheets are reduced. Moreover, the Index Erichsen (IE) values of these as-annealing sheets generally decrease at room temperature. These IE values are negatively correlated with the content of second phase, and the presence of nano-scale second phase further make IE values get worse at room temperature. It is indicated that the second phase plays an important role in subduction of formability improvement by texture modifying. These second phase is the critical factor to determine the formability of these sheets at room temperature.

Duke Scholars

Author Zhaohui Wang Pathology