The micros true ture and mechanical properties of AZ80 alloy with different Gd contents were investigated.The results reveal that a minor addition of Gd could lead to a change in the type of second phase particles from Al-Mn to Al-Gd-Mn,and the primary rare earth phase is Al8GdMn4instead of Al2Gd in the AZ80-0.3Gd alloy.New strip-like Al3Gd and block-shaped Al2Gd phases are formed successively with the increase of Gd content.Al2Gd phase becomes the dominating rare earth phase in AZ80-2.0Gd and AZ80-4.0Gd alloys.Tensile test indicates that the mechanical properties are improved obviously with a proper Gd content.However,excessive Gd addition results in the decrease of mechanical properties due to the formation of coarse block-shaped Al2Gd phase.AZ80-0.9Gd alloy exhibits the optimal mechanical properties among all the experimental alloys,in which the ultimate tensile strength(UTS),yield strength(YS)and elongation are 210,130 MPa and 8.2%,respectively.
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