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

页码：255 / 262

页数：8

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