RT Journal Article
SR Electronic
A1 Kejzlar, Pavel
T1 Structure and mechanical properties of Fe-25Al-5Zr and Fe-30Al-5Zr intermetallic alloys
JF Manufacturing Technology Journal
YR 2012
VO 12
IS 2
SP 131
OP 135
DO 10.21062/ujep/x.2012/a/1213-2489/MT/12/2/131
UL https://journalmt.com/artkey/mft-201202-0009.php
AB 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.