Precipitation and Dissolution of Solute Atoms in High Purity and Commercial Al–Zr Alloys

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  • Precipitation and Dissolution of Solute Atoms in High Purity and Commercial Al–Zr Alloys
  • Precipitation and Dissolution of Solute

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The precipitation and dissolution behaviors of various alloying elements by accumulative isochronal treatment were investigated in the high-purity Al-0.35 mass%Zr alloys containing 0 to 0.2 mass%Fe or 0 to 0.2 mass%Si and the commercial Al-0.35 mass%Zr alloys containing 0.15 mass%Fe and 0.05 to 0.15 mass%Si. The solute concentrations of the alloying elements are discussed in terms of the changes in resistivity and in amount of the precipitated elemental Si determined by wet chemical analysis (WCA). In the accumulative isochronal heat treatment, i.e. holding for 3.6 ks at temperatures of every 50 K, the addition of Fe slightly accelerates the precipitation of Zr, while the addition of Si significantly accelerates the precipitation of Zr. The most significant acceleration of Zr precipitation is observed at temperatures 50 to 100 K lower than the temperature at which the maximum amount of Zr precipitates both in the Al–Zr–Fe and Al–Zr–Si alloys. The effects of Fe and Si additions on the precipitation of Zr are considered to be mainly attributed to solute Fe and Si atoms, respectively. The stagnation of decrease in resistivity is observed at 523 to 623 K in the high-purity Al–Zr–Si alloys. In the commercial Al–Zr–Fe–Si alloys, the resistivity either stagnates or even re-increases at 523 to 573 K. The change in the amount of precipitated elemental Si in the commercial alloys, estimated by the WCA, corresponds well with the stagnation or the re-increase of resistivity.

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