Effect of La and Nd on microstructures and
mechanical properties of AZ61 wrought magnesium alloy①
mechanical properties of AZ61 wrought magnesium alloy①
(National Engineering Research Center of Light Alloys Net Forming,
School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China)
School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China)
Abstract: Effects of La and Nd addition on the microstructure and mechanical properties of the AZ61 alloy have been investigated. The results show that when La and Nd are added into the AZ61 alloy respectively, theβ(Mg17-Al12) phase is refined and granulated, and new phases are formed in the form of small rod-like shape, which are verified as La3Al11and Nd3Al11phase by X-ray diffraction and TEM observation. Microstructure observations show that the effective efficiency of La addition is higher than that of Nd addition, thus the sizes ofβ(Mg17Al12) and La3Al11phase are relatively smaller than those ofβ(Mg17Al12) and Nd3Al11phases in both AZ61 alloy and Nd-containing alloy. The increase of the tensile strength and elongation of AZ61 alloy refers to the existence of small rod-like La3Al11and Nd3Al11phases, and fine granulatedβ (Mg17Al12) phase.
Key words: AZ61 alloy; RE; microstructure; mechanical properties