Abstract
Abstract The strength of B2-ordered Fe60Al40 has been investigated with respect to the influence of vacancies and interstitial impurities. Preconditioned states with different ratios of the concentration of vacancies and interstitial impurities have been established, which then were recovered by subsequent annealing treatments. The evolution of the recovered states with temperature has been monitored by measuring the strength (ultra-microhardness) at room temperature as a function of the annealing temperature. The observed dependencies are discussed on the basis of the resistance of vacancies and impurities to dislocation motion, of vacancy–interstitial interactions and also of the possible formation and dissolution of precipitates (primarily perovskites). The yield stress maximum which, independent of the stoichiometry, appears near 800 K is found to be controlled by vacancy migration in combination with strain ageing by interstitial agglomerates and by the formation of precipitates.
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