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an Al-Al3Er eutectic reaction with Al3Er exhibiting a stable L12 crystal structure [8]. DALEN et al [8] and WEN et al [9] had investigated the solubility of Er in aluminum and the isochronal aging behavior... and found that Er addition is capable of strengthening and nanoscale Al3Er dispersions can inhibit recrystallization. There are investigations on precipitation strengthening in Al-Zr-Yb alloys, which......