Design and Characterization of Hierarchically-Strengthened, Cast Al-Ce-Ni-Mn-Sc-Zr Alloys for High-Temperature Applications

被引：0
作者：
Ekaputra, Clement N. [1 ]
Rakhmonov, Jovid U. [1 ,2 ]
Senvardarli, Ekin [1 ]
Weiss, David [3 ]
Mogonye, Jon-Erik [4 ]
Dunand, David C. [1 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA
[3] Eck Ind, Manitowoc, WI 54220 USA
[4] US Army Combat Capabil Dev Command, Army Res Lab, Aberdeen Proving Ground, MD 21005 USA
来源：
LIGHT METALS 2024 | 2024年
关键词：
Aluminum alloys; Microstructure; Mechanical properties; High-temperature; Hierarchical strengthening; MECHANICAL-PROPERTIES; CREEP; AMBIENT; SILICON; ORIGIN; CERIUM;
D O I：
10.1007/978-3-031-50308-5_32
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
We characterize the microstructure and mechanical properties of cast Al-Ce-Ni-Mn-Sc-Zr alloys designed for structural use above 300 degrees C. We first report on the effect of Ni on the as-cast phase formation, where all alloys consist of fine Al11Ce3 and Ni-rich eutectic phases, but the identity of the Ni-rich phase varies with Ni content. Furthermore, these alloys contain four coarsening-resistant strengthening phases as determined from SEM and APT investigations: (i) Al11Ce3 and (ii) Ni-rich micron-scale platelets formed during eutectic solidification, (iii) Ll(2)-Al-3(Sc,Zr) nanoprecipitates formed during secondary aging, and (iv) Mn solute in the alpha-Al matrix. The Al-Ce-Ni-MnSc-Zr alloy possesses higher microhardness and creep resistance than compositionally simpler alloys containing fewer of the strengthening phases, indicating that these strengthening mechanisms synergize to provide increased ambient- and elevated-temperature strength.
引用
收藏
页码：255 / 262
页数：8
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