A Strategy for Phase Identifiction of Precipitates in High Al-containing Austenitic and Ferritic Steels Using Electron Diffraction
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A strategy for phase identification of precipitates in high Al-containing austenitic and ferritic steels using electron diffraction (ED) is studied. Comparative studies of the various Al-containing precipitates (k-carbide, Ni3Al, Fe3Al, FeAl) show the similarities of crystal structure and lattice parameter. However, the slight differences of lattice parameter and structure display characteristic ED patterns (EDPs) which can be identified. L12 k-carbide and Ni3Al can be differentiated by the length of g (the reciprocal lattice vector), even though they show perfectly identical shapes of EDPs. DO3 Fe3Al and B2 FeAl show the characteristic EDs in [110] and [112] beam directions due to the differences of Fe site occupancies in unit cells. k-carbide, Ni3Al, and FeAl show also the similar EDs in [112], [112], and [110] beam directions, respectively. All the possible similarities of EDs among each phases and the strategy for phase identiἀcation are discussed on the bases of kinematical ED simulation.
Abstract
A strategy for phase identification of precipitates in high Al-containing austenitic and ferritic steels using electron diffraction (ED) is studied. Comparative studies of the various Al-containing precipitates (k-carbide, Ni3Al, Fe3Al, FeAl) show the similarities of crystal structure and lattice parameter. However, the slight differences of lattice parameter and structure display characteristic ED patterns (EDPs) which can be identified. L12 k-carbide and Ni3Al can be differentiated by the length of g (the reciprocal lattice vector), even though they show perfectly identical shapes of EDPs. DO3 Fe3Al and B2 FeAl show the characteristic EDs in [110] and [112] beam directions due to the differences of Fe site occupancies in unit cells. k-carbide, Ni3Al, and FeAl show also the similar EDs in [112], [112], and [110] beam directions, respectively. All the possible similarities of EDs among each phases and the strategy for phase identiἀcation are discussed on the bases of kinematical ED simulation.
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