Abstract
This paper studied the effect of Zr content on the elongation of an Al–Sc alloy. It has been shown that the elongation decreases with increasing annealing time for all the tested alloys. The decrease in the elongation during annealing is due to the increases in the size and volume fraction of the second phase particles, which results in the decreases in the particle interspacing and geometric slip distance with the annealing time. At any annealing time, the elongation increases with decreasing Zr content, indicating that the alloy with a higher Zr content has a lower elongation. The low elongation of the alloy with higher Zr content results from the larger density and volume fraction, and smaller size and interspacing of the second phase particles, which substantially decreases the geometric slip distance.
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