The effects of Ce and Ti additions on the microstructures and mechanical properties of an Al-Cu-Mg-Ag alloy have been studied. It has been shown that either Ce or Ti can decrease the as-cast grain size of the Al-Cu-Mg-Ag alloy,increase the nucleation ratio for Ω phase as heterogeneous nucleation centers,inhibit the growth of Ω phase during aging,and thus increase the volume fraction and decrease the spacing of Ω phase.These microstructures increase the yield strength and tensile strength. However, if both Ce and Ti are added to the alloy,they form (Ce,Ti)-contained compounds and increase the grain size during casting,but have no effects on the nucleation and the growth of Ω phase during aging.The alloy containing both Ce and Ti has a relatively lower Vicks hardness and strength compared to the alloy containing either Ce or Ti.
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