Abstract
The effects of adding Si to Al-Zr-Yb alloys are studied to determine the impact of Si on precipitation evolution in dilute Al-Zr-Yb-based alloys. By adding Si to Al-Zr-Yb-based alloys, a high density of small, coherent L12-structured Al3(Yb,Zr) precipitates and lots large number of L12-structured (Al,Si)3(Yb,Zr) precipitates along the dislocation are precipitated. This phenomenon could be attributed to the acceleration of Zr diffusivity by addition of Si and the rapid nucleation of L12-structured Al3Yb by addition of Yb. The content of Yb in the Al3(Yb,Zr) precipitates in Al-Zr-Yb-Si alloys is very low, which causes higher coherency and smaller size of the precipitates. The high density precipitates result in outstanding improvement of precipitation-hardening effect in Al-Zr-Yb-based alloys.
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