Microstructure and properties of in situ nanometric Al2O3 reinforced α-Fe(Al)–Fe3Al-based composites

The alpha phase Fe(Al)–Fe3Al-based composites reinforced with 4–9vol.% α-Al2O3 dispersions were fabricated by hot-pressing sintering. Nanometer-sized α-Al2O3 dispersed homogeneously in the submicron α-Fe(Al) and Fe3Al matrix, with a 20% lattice-mismatch presented between α-Al2O3 and α-Fe(Al). Higher...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-11, Vol.526 (1-2), p.50-55
Main Authors: Li, Jia, Kwong, Fung-luen, Shi, Riu-xia, Ng, Dickon H.L., Yin, Yan-sheng
Format: Article
Language:English
Subjects:
Applied sciences
Dispersion hardening metals
Elasticity. Plasticity
Exact sciences and technology
Iron aluminides composite
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical testing
Metals. Metallurgy
Microstructure
Particulate-reinforced
Powder metallurgy. Composite materials
Production techniques
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Summary:The alpha phase Fe(Al)–Fe3Al-based composites reinforced with 4–9vol.% α-Al2O3 dispersions were fabricated by hot-pressing sintering. Nanometer-sized α-Al2O3 dispersed homogeneously in the submicron α-Fe(Al) and Fe3Al matrix, with a 20% lattice-mismatch presented between α-Al2O3 and α-Fe(Al). Higher fracture toughness (39MPam1/2) and bending strength (1260MPa) were obtained for composites containing both intragranular and intergranular Al2O3 grains. The combination of fine grain strengthening with dispersion strengthening can account for the improvement of mechanical properties.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2009.07.014