The effects of mixed rare earth and T6 heat treatment on the microstructure and mechanical properties of ZL105 alloy were studied by optical microscope,scanning electron microscope,EDS analyzer,Brinell hardness test and tensile test.The results show that the α-Al phase,eutectic Si phase and Fe-rich phase of ZL105 alloy are refined by adding 0.5wt%(Pr+Ce)rare earth.After T6 heat treatment of ZL105-0.5wt%(Pr+Ce)alloy,the α-Al phase is further refined,the grains tend to be rounded,and the eutectic Si phase is further refined from long strip to short grain.However,the morphology and size of the Fe-rich phase does not change significantly.The tensile strength,elongation and hardness of T6 ZL105-0.5wt%(Pr+Ce)alloy are 257.7 MPa,7.0%and 98 HB,respectively.The fracture surface of the T6 treated ZL105-0.5wt%(Pr+Ce)alloy is a typical plastic fracture feature.There are many dimples on the surface of the fracture,mainly small dimples,with a relatively uniform and dense distribution.The mechanical properties of the modified alloy with T6 heat treatment are significantly improved.
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