Effects of Y Content on Microstructure and Mechanical Properties of Mechanical Vibration ZL114A Alloy
In order to improve the mechanical properties of ZL114A,the rare earth Y was added to modify ZL114A alloy under the mechanical vibration,and the influence of Y on microstructure and mechanical properties was investi-gated.The results indicate that rare earth Y can effectively refine α-Al dendrites and promote the transformation of α-Al dendrites from coarse dendritic to rose-like.Moreover,the eutectic silicon exhibits short rods and uniform distri-bution.With the increase of Y content,the tensile strength,elongation,and hardness of alloy presents a trend of increasing firstly and then decreasing.The secondary dendrite spacing of alloy reaches the minimum of 20.4 μm with 0.6%Y,and the tensile strength,elongation,and hardness values reach the maximum,which are 370.92 MPa,6.8%,and 91.08 HV,respectively.When Y content exceeds 0.6%,α-Al is gradually coarsed,and the rare earth phase is converted from small blocks to long rods.
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