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- W4293259734 abstract "Controlled Mn and Zr additions to Al-Cu alloys have allowed for the improved retention of mechanical properties after extended 350°C exposures by stabilizing the main strengthening θ' (Al2Cu) phase. Ultimately, θ'/L12 (Al3Zr) co-precipitate formation stabilizes θ' most effectively; however, Zr diffuses sluggishly and has low solubility in aluminum castings. Increasing the Zr segregation rate would allow for faster and more effective θ'/L12 co-precipitation. It is demonstrated that the Zr segregation rate is faster when the Zr matrix content is higher. A much higher Zr matrix content facilitated by rapid cooling during additive manufacturing (AM) was achieved that produces faster θ'/L12 co-precipitation, which is shown by scanning transmission electron microscopy and atom probe tomography experiments. It was also found that Zr continuously segregates to θ' interfaces up to the most aggressive heat treatment studied such that planar L12 precipitates remain after the metastable θ' dissolves. In this manner, we demonstrate that θ' coherent interfaces serve as perfect templates to form stable planar L12 precipitates that can provide strength at higher temperatures than traditional θ' strengthened AlCu alloys. This work introduces an alloy design strategy that uses metastable precipitates to quickly nucleate and grow co-precipitates with a desired geometry that contain slow diffusing elements. These ideas can be applied to engineer more heat resistant alloys by taking advantage of high solute matrix contents enabled by rapid cooling during additive manufacturing." @default.
- W4293259734 created "2022-08-27" @default.
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- W4293259734 date "2022-12-01" @default.
- W4293259734 modified "2023-09-27" @default.
- W4293259734 title "Using <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si7.svg><mml:msup><mml:mi>θ</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> interfaces as templates for planar L12 precipitation in AlCuMnZr alloys" @default.
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- W4293259734 doi "https://doi.org/10.1016/j.addlet.2022.100086" @default.
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