Improving mechanical properties and corrosion resistance of Mg-6Zn-Mn magnesium alloy by rapid solidification

摘要

The current work presents the room-temperature mechanical properties and the corrosion resistance in 3.5% NaCl solution of conventional casting and rapidly solidified Mg-6Zn-Mn (ZM61) magnesium alloys. It is found that the mechanical properties of rapidly solidified ZM61 alloy are dramatically enhanced, with the ultimate strength increased from 335 MPa to 460 MPa (37% increment), which can be attributed to the formation of the refined dendrite microstructure and the strengthening MgZn_2 phase distributed within the matrix. Furthermore, the rapidly solidified ZM61 alloy performs better in corrosion resistance than the extruded ZK60 and pure Mg alloys, suggesting that the rapid-solidification technique is a promising way to improve the strength and corrosion resistance of magnesium alloy for the structural and corrosive media utilization.