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Precipitation Strengthening in Al (Sc,Ti) Alloys

Marsha E. van Dalen, David C. Dunand, David N. Seidman

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Abstract

microscopy Three-dimensional atom probe (3DAP) and field-ion microscopies, together with microhardness measurements, are employed to analyze Al3(Sc1-xTix) precipitates in an Al-0.06at%Sc-0.06at.%Ti alloy aged at 300°C for different times. The field-ion microscope images show a relatively high number density of precipitates (estimated at (3±2)×1021ppt m-3) at the aging times analyzed. Concentration profiles obtained with 3DAP microscopy show that both Sc and Ti partition to these precipitates. While most of the Sc is contained in the precipitates, the Ti resides mainly in the matrix in solid solution. Consequently, the addition of Ti increases the hardness of this alloy only modestly over that of binary Al-Sc alloys. Additionally, the coherent Al3(Sc1-xTix) precipitates remain stable and coarsening-resistant up to aging times of at least 240 hr. at 300°C.

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What this paper is about

microscopy Three-dimensional atom probe (3DAP) and field-ion microscopies, together with microhardness measurements, are employed to analyze Al3(Sc1-xTix) precipitates in an Al-0.06at%Sc-0.06at.%Ti alloy aged at 300°C for different times. The field-ion microscope images show a relatively high number density of precipitates (estimated at (3±2)×1021ppt m-3) at the aging times analyzed. Concentration profiles obtained with 3DAP microscopy show that both Sc and Ti partition to these precipitates. While most of the Sc is contained in the precipitates, the Ti resides mainly in the matrix in solid solution. Consequently, the addition of Ti increases the hardness of this alloy only modestly over that of binary Al-Sc alloys. Additionally, the coherent Al3(Sc1-xTix) precipitates remain stable and coarsening-resistant up to aging times of at least 240 hr. at 300°C.

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Available abstract

microscopy Three-dimensional atom probe (3DAP) and field-ion microscopies, together with microhardness measurements, are employed to analyze Al3(Sc1-xTix) precipitates in an Al-0.06at%Sc-0.06at.%Ti alloy aged at 300°C for different times. The field-ion microscope images show a relatively high number density of precipitates (estimated at (3±2)×1021ppt m-3) at the aging times analyzed. Concentration profiles obtained with 3DAP microscopy show that both Sc and Ti partition to these precipitates. While most of the Sc is contained in the precipitates, the Ti resides mainly in the matrix in solid solution. Consequently, the addition of Ti increases the hardness of this alloy only modestly over that of binary Al-Sc alloys. Additionally, the coherent Al3(Sc1-xTix) precipitates remain stable and coarsening-resistant up to aging times of at least 240 hr. at 300°C.

Key concepts: Atom probe, Field ion microscope, Precipitation, Materials science, Alloy, Indentation hardness, Metallurgy, Optical microscope

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