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This study examined the phase transformation of ordered intermetallic precipitates to thermodynamically stable austenite in iron alloys assisted by a dislocation glide or climb. In Fe-Mn-Ni alloys, ordered fct θ-MnNi precipitates formed in the martensite grains and at the lath and grain boundaries during aging after quenching. With further aging, stacking faults and twins formed in the θ-MnNi particles...
The transformation of the grain boundary hexagonal close-packed η-Ni 3 Ti (DO 24 ) precipitates to face-centered cubic austenite (γ) was investigated in an Fe–Ni–Ti alloy using transmission electron microscopy. The heterogeneous nucleation of austenite on the (0001) basal plane of the η-Ni 3 Ti precipitate was identified. During the growth of the interface austenite, ordered...
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