Effects of Rare Earth Ce Modification on Microstructure and Mechanical Properties of ADC12 Al Alloy
The effects of rare earth Ce modification on the microstructure and mechanical properties of ADC12 Al alloy were studied by optical microscope,scanning electron microscope,tensile testing machine and Brinell hardness tester.The results show that when the rare earth Ce with 0.6wt％is added,the coarse primary α-Al phase transformation in the microstructure is round,fine and evenly distributed,and the eutectic Si phase changes from needle-like to granular.The eutectic reaction between rare earth Ce and Al in the alloy produces intermetallic compounds such as Al11Ce3,which is long needle and bright white under scanning electron microscope.The yield strength,tensile strength and elongation of the alloy with 0.6％Ce is increased to 171.72 MPa,260.37 MPa and 4.1％,respectively,which are 33.83％,48.69％and 155％ higher than those without Ce addition,respectively.At the same time,the Brinell hardness of the alloy also peaks at 88 HB.
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