Abstract
Annealing B2-ordered iron aluminides at various temperature significantly affects room temperature mechanical properties such as hardness and yield strength. This effect is caused by the retention of high concentrations of thermal vacancies during cooling. A recent study has correlated hardness changes with calculated vacancy concentrations and has concluded that vacancies cause strengthening through a point defect-dislocation interaction mechanism. The present work expands the study of the effects of annealing temperature on the mechanical properties of iron aluminides, and also includes the effects of annealing temperature on the environment-induced embrittlement of these materials. Fe-36 at.% Al specimens, after various annealing treatments, were tensile tested in oxygen and air; testing in dry oxygen results in relatively high ductilities by eliminating environmental embrittlement.
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