Structure and stability of Laves phases. Part I. Critical assessment of factors controlling Laves phase stability

This paper reviews the deformation, fracture and alloy design of B2 iron aluminides based on FeAl. Moisture-induced environmental embrittlement is shown to be a leading cause of low tensile ductility and brittle cleavage fracture of Ferich FeAl alloys at ambient temperatures. With increasing Al concentration, two other factors, namely intrinsic grain-boundary weakness and quenched-in vacancies become important in limiting the tensile ductility of FeAl alloys. FeAl alloys show a yield-strength anomaly at intermediate temperatures. Recent work indicates that the anomaly is a result of hardening by thermal vacancies at elevated temperatures. The understanding of the deformation and fracture behavior has led to the development of FeAl-base alloys and composites with improved metallurgical and mechanical properties for structural applications. These FeAl-based alloys can be prepared by melting and casting or by powder processing. The unique combination of the excellent oxidation and carburization/sulfidation resistance coupled with relatively low material density and good mechanical properties at room and elevated temperatures has sparked industrial interest in FeAl alloys and composites for a number of applications.

Recent advances in B2 iron aluminide alloys : deformation, fracture and alloy design

Physical Metallurgy and Mechanical Properties of Transition-Metal Laves Phase Alloys

Structure and mechanical properties of the AlCrxNbTiV (x = 0, 0.5, 1, 1.5) high entropy alloys

The B2 compound FeAl has attracted considerable attention in the past 20 years as a candidate material for structural applications both in hostile environments and at intermediate temperatures. However, until lately, the mechanical behaviour of FeAl was not well understood because the effects of both vacancy retention following elevated temperature heat treatments and environmental embrittlement were not taken into account. More recently, testing performed under conditions where these effects are controlled has taken place, allowing a more complete understanding of the compound's mechanical properties. The aim of the present paper is to provide an overview of the mechanical behaviour of FeAl, with particular emphasis on recent studies, together with, where appropriate, reinterpretation of older data, in light of our present understanding.

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Mechanical properties of FeAl

https://digital.library.unt.edu/ark:/67531/metadc664016/m2/1/high_res_d/2723.pdf

L.M Pike

Papers

Physical Metallurgy and Mechanical Properties of Transition-Metal Laves Phase Alloys

Point defects in binary Laves phase alloys

Environmental and Strain Rate Effects on the Ductility and Yield Strength of Fe-40Al

Environmental effects on the tensile properties of two Ni3Si-based alloys

The effect of vacancies on the environmental yield strength dependence of boron-free and boron-doped Fe-40Al