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Fabrication and High Temperature Creep Behaviour of Interpenetrated Nickel–Chromium/Alumina Composites
Author(s) -
Haeger Andreas,
Schell Karl G.,
Nagel Alwin,
Bucharsky Ethel C.,
Oberacker Rainer,
Hoffmann Michael J.
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201200055
Subject(s) - materials science , creep , composite material , microstructure , nickel , composite number , alloy , porosity , superalloy , chromium , metallurgy
A method to manufacture unique interpenetrating 50 vol% nickel–chromium/alumina composites, namely NiCr8020/Al 2 O 3 /50 pp , is reported. Key process is a high temperature squeeze casting procedure at temperatures above 1500 °C used to infiltrate alloy NiCr8020 into porous alumina preforms exhibiting a bimodal pore structure. Microstructure and mechanical properties of this new composite material are presented. Bending creep tests at 1000 and 1150 °C are performed. The obtained results are discussed in comparison to a nickel based superalloy. It is shown, that particle preform reinforcement is a promising method to improve creep resistance of nickel based alloys significantly. Due to its outstanding creep resistance, the composite material has a high potential for structural and tribological applications at high temperatures in oxidizing atmospheres.