Effect of Rare Earth Ce on Micro structure and Properties of Semi-Solid Squeeze Casting AlSi10Cu3Fe Alloy
The effects of rare earth Ce on the microstructure and properties of semi-solid squeeze cast AlSi10Cu3Fe alloy were analyzed by means of optical microscope,X-ray diffractometer,scanning electron microscope,electronic universal testing machine,microhardness tester and conductivity meter.The results showed that the rare earth Ce had an excellent refining effect on the micro structure of the semi-solid squeeze cast alloy,when the rare earth addition was 0.5％,the microstructure refining effect of the semi-solid alloy was the best,the primaryα-Al phase presented an equiaxed or spherical crystal morphology,and the distribution was very uniform and orderly.The average grain size and grain shape factor of the alloy were 48 μm and 0.75,respectively.The grain size was reduced by 51.51％and the shape factor was increased by 53.06％compared with those of the alloy without Ce.At the same time,the mechanical properties of the semi-solid alloy also reached the peak,and its tensile strength,elongation and microhardness were 231.98 MPa,7.8％and HV 100.15,respectively,which were increased by 37.81％,59.18％and 25.38％compared with the alloys without rare earth.The electrical conductivity of alloys without rare earth Ce and 0.5％rare earth Ce was 38.56％IACS and 43.27％IACS,respectively.The addition of the rare earth Ce also contributed to the improvement of the electrical conductivity of the alloys.
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