Microstructure and Mechanical Properties of Heat-resistant Al-Ce Alloy
The microstructures and properties of Al-x Ce(x=6,8,10,12,%)and Al-8Ce-y Ni(y=2,3,4,5,6,%)alloys were investigated by means of OM,SEM,XRD and EDS.The results indciate that with the increase of Ce con-tent,the α-Al dendrites are refined significantly,and the volume fraction of eutectic Al11Ce3 phase is increased.With Ce content of 12%,the coarse primary Al11Ce3 phase is formed.With the increase of Ni content,the range of solid-liquid phase zone in Al-8Ce-y Ni alloy is narrowed,and the compositional undercooling degree of the solid-liquid inter-face of α-Al crystal is increased,leading to the branching acceleration of α-Al crystal.As a result,the dimension of α-Al dendrites is refined,meanwhile,the ternary eutectic group network structure composed of Al3Ni and Al11Ce3 is generated.The tensile strength of Al-8Ce-y Ni alloys at room temperature and elevated temperature(350℃)reach the maximum values of 189 MPa and 72 MPa,respectively,when the Ni content is 6%.
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