Manufacturing Technology 2012, 12(2):131-135 | DOI: 10.21062/ujep/x.2012/a/1213-2489/MT/12/2/131

Structure and mechanical properties of Fe-25Al-5Zr and Fe-30Al-5Zr intermetallic alloys

Pavel Kejzlar
Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentska 1402/2, 461 17 Liberec 1, Czech Republic

Iron aluminides are seen as promising candidates for high temperature structural materials to replace expensive nickel-chromium-based stainless steel. Due to their long-distance-ordered structure they exhibit some advantageous properties as an excellent corrosion resistance, low density, high specific stiffness and low raw material cost. On the other hand, they are inherently brittle at ambient temperatures and have insufficient high temperature strength and creep resistance. It has been shown that addition of Zr into Fe-Al-based material leads to precipitation hard ternary intermetallic phases which may enhance high temperature strength. Addition of 5 at. % of Zr into the investigated alloys leads to formation of λ1 and/or τ1 phase which have a significant effect on the σ0.2 yield stress. In this paper, light optical microscopy, scanning electron microscopy, X-ray diffraction and high temperature pressure test were used to characterize the structure and mechanical properties of Fe-25Al-5Zr and Fe-30Al5-Zr alloys in as cast state and after heat treatment.

Keywords: Iron Aluminides, Intermetallics, Structure, High temperature mechanical properties

Published: December 1, 2012  Show citation

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Kejzlar P. Structure and mechanical properties of Fe-25Al-5Zr and Fe-30Al-5Zr intermetallic alloys. Manufacturing Technology. 2012;12(2):131-135. doi: 10.21062/ujep/x.2012/a/1213-2489/MT/12/2/131.
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