Abstract
The precipitation hardening and coarsening resistance of precipitates were studied in Al–Yb, Al–Zr and Al–Yb–Zr alloys during aging at 400°C. The aged Al–0.03Yb–0.06Zr alloy forms core–shell structured Al3(Yb,Zr) precipitates and the core and shell of precipitates are enriched in Yb and Zr respectively. Due to the dense and core–shell structured Al3(Yb,Zr) precipitates, the Al–0.03at%Yb–0.06at%Zr alloy obtains a maximum hardness of 485MPa, which is greater than that of the Al–0.03at%Yb and Al–0.06at%Zr alloys. The Al3(Yb,Zr) precipitates in Al–0.03at%Yb–0.06at%Zr have remarkable coarsening resistance with a time exponent for the average radius of precipitates 1/n=0.19±0.02, which is smaller than that for Al–0.03Yb (0.34±0.01).
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