Open AccessBoron strengthening in FeAl
Author(s) -
Ian Baker,
X. Li,
H. Xiao,
Oliver Klein,
Christopher E. Nelson,
R. Carleton,
E.P. George
Publication year - 1998
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/676870
Subject(s) - boron , feal , materials science , grain size , stoichiometry , strengthening mechanisms of materials , metallurgy , sigma , aluminium , diffusion , crystallography , analytical chemistry (journal) , thermodynamics , chemistry , physics , intermetallic , organic chemistry , alloy , quantum mechanics , chromatography
The effect of boron on the strength of B2-structured FeAl is considered as a function of composition, grain size and temperature. Boron does not affect the concentrations of antisite atoms or vacancies present, with the former increasing and the latter decreasing with increasing deviation from the stoichiometric composition. When vacancies are absent, the strength increase per at. % B per unit lattice strain, {Delta}{sigma}/({Delta}c x {epsilon}) increases with increasing aluminum concentration, but when vacancies are present (>45 at. % Al), {Delta}{sigma}/({Delta}c x {epsilon}) decreases again. Boron increases grain size strengthening in FeAl. B strengthening is roughly independent of temperature up to the yield strength peak but above the point, when diffusion-assisted deformation occurs, boron strengthening increases dramatically
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