Effects of neodymium rich rare earth elements on microstructure and mechanical properties of as cast AZ31 magnesium alloy

摘要

The effects of neodymium rich rare earth elements [RE(Nd)] on microstructure and mechanical properties of as cast AZ31 magnesium alloy were investigated. The microstructures of as cast AZ31-xRE(Nd) alloys display a dendrite configuration, and the secondary dendrite spacing of the a-Mg phase was decreased with the increasing Nd content. The addition of RE(Nd) resulted in the formation of AI_2Nd and Mg_(12)Nd phases. Mechanical properties were improved significantly due to grain refinement and precipitation of intermetallic phases. When the amount of RE is 1 -0 wt-%,The as cast AZ31 alloy reached its maximum tensile strength of 249 MPa at room temperature, yield strength of 169 MPa and elongation of 9-0%.