Effects of rare earth Ce on microstructure,mechanical properties and corrosion resistance of Al-Si alloys
The microstructure,mechanical properties and corrosion resistance of Al-Si alloys with different contents of rare earth cerium(w(Ce):0％,0.3％,0.6％and 0.9％,respectively)were studied under melting and casting conditions.The research results show that the addition of rare earth Ce greatly optimizes the microstructure of the Al-Si alloy,the α-Al dendrites are obviously refined,and the dendrites become very round and regular.The eutectic Si phase also becomes very fine,and the edge of the granular eutectic Si phase is rounded and ordered.With the increased addition of rare earth Ce,the tensile properties and microhardness of the Al-Si alloy gradually increased.When the content of rare earth Ce is 0.6％,the tensile strength,e-longation and microhardness of the alloy reach the peak values of 228.96 MPa,5.1％and 109.5 HV,respectively,which are 24.59％,54.55％and 40.74％higher than those of the alloy without rare earth Ce.And the corrosion resistance of the alloy is the best at this time.The weight loss corrosion rate of the alloy is only 11.36 mg/(cm2·d)by immersion test,which is 50％lower than that of the unmodified Al-Si alloy matrix.
万方数据
维普
