Abstract
It is well known that FeAl has many thermal vacancies at high temperature which lead to significant hardening. During slow quenches from high temperature or on annealing after quenching vacancies annihilate at sinks leading to dislocation creation. The relative importance of hardening by vacancies and by dislocations has not been examined and is one objective of this study. There has been considerable effort devoted to the examination of vacancies in FeAl alloys, because of the large thermal vacancy concentrations and because of the hardening. The concentration of vacancies can be as high as several per cent for alloys close to stoichiometry at high temperatures, corresponding to a very low enthalpy for vacancy formation. The value depends on the Al content, with smaller values and larger vacancy concentrations for alloys near FeAl stoichiometry. Typical values range from 118kJ/mol for Fe-23.7%Al (atomic %), to 34 kJ/mol for stoichiometric FeAl.
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