Combining solution-, precipitation- and load-transfer strengthening in a cast Al-Ce-Mn-Sc-Zr alloy

Ekaputra, Clement N.; Rakhmonov, Jovid U.; Senvardarli, Ekin; Weiss, David; Mogonye, Jon-Erik; Dunand, David C.

doi:10.1016/j.actamat.2024.119683

Combining solution-, precipitation- and load-transfer strengthening in a cast Al-Ce-Mn-Sc-Zr alloy

Journal Article · Sat Jan 13 00:00:00 EST 2024 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2024.119683· OSTI ID:2376296

^[1]; Rakhmonov, Jovid U. ^[2]; ^[1]; ^[3]; ^[4]; Dunand, David C. ^[1]

Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Eck Industries, Manitowoc, WI (United States)
Army Research Laboratory, Adelphi, MD (United States)

Here, a cast Al-9Ce-0.75Mn-0.18Sc-0.12Zr (wt%) alloy is designed to combine three strengthening phases: (i) micron-scale Al₁₁Ce₃ platelets formed during eutectic solidification, (ii) nano-scale L1₂-Al₃(Sc,Zr) precipitates formed during aging, and (iii) Mn in solid solution in the α-Al matrix. Microstructural analyses by SEM, TEM, and atom-probe tomography reveal that Mn remains in solid solution in the as-cast alloy, providing solution strengthening with no influence on the eutectic Al-Al₁₁Ce₃ microstructure, which provides precipitation- and load-transfer strengthening. During long-term over-aging at 400 °C, Mn-rich precipitates grow at the Al-Al₁₁Ce₃ interface, with no effect on the microhardness. However, after short aging at 350 °C, a high number density of fine L1₂-Al₃(Sc,Zr) nanoprecipitates form in the Al matrix (with a coarser size at the Al-Al₁₁Ce₃ interface), providing precipitation strengthening. The synergistic combination of the three strengthening mechanisms (solution, precipitation, and load transfer) in our Al-Ce-Mn-Sc-Zr alloy results in higher microhardness after aging at 350 and 400 °C, and higher creep resistance at 300 °C, as compared to alloys with two strengthening mechanisms: an Al-10Ce-0.93Mn control alloy (without precipitation strengthening from Sc and Zr), Al-Ce-Sc-Zr (without solution strengthening from Mn), and Al-Mn-Zr-Er (without load-transfer strengthening from Ce). Furthermore, these dual-strengthened alloys are more creep resistant than alloys with a single strengthening mechanism (Al-Ce, Al-Mn, and Al-Sc-Zr), confirming that the three mechanisms can be combined in pairs or all together.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Laboratory (USARL); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2376296

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 266; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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