Effect of Cr Content on Microstructure and Heat Exposure of Al-Cu-Mg-Ag Alloy
The effect of Cr content on microstructure and heat exposure of Al-Cu-Mg-Ag alloys was investigated.It is found that strength of the alloys at room temperature decreases after an initial increase as Cr content increases,and the 0.2%Cr alloy exhibits excellent room-temperature mechanical properties.Transmission quantitative calculation results suggest that an addition of 0.2%Cr can promote precipitation of Ω phase and improve coarsening resistance of Ω phase in the alloy after heat exposure.With the addition of Cr exceeding 0.3%,the(Al,Cr,Mn,Ti)-enriched phases precipitate at the grain boundaries of the alloy,leading to coarser grains.
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