Abstract
Effects of thermo-mechanical treatment on a Fe–30Mn–6Si shape memory alloy were investigated, including the microstructure, precipitation behavior and shape memory performance. Experimental results show that the as-cold-rolled specimen exhibits a worse shape recovery, and its M s temperature and transformational enthalpy (Δ H) are much lower than those of as-annealed one. Specimens with 10% cold-rolling and subsequent 550–650 °C aging have lots of (Fe, Mn) 3Si precipitates within the grain interior. These precipitates exhibit a D0 3 structure with lattice constant of 5.66 Å, and show a near orientation relationship with γ austenite as [ 1 ¯ 1 1 ] D 0 3 / / [ 0 1 1 ] γ , ( 2 ¯ 0 2 ¯ ) D 0 3 / / ( 1 ¯ 1 ¯ 1 ) γ . The 550–650 °C aged specimen can exhibit high shape recovery ratios, due to the contributions of effective nuclei and well-aligned precipitates within the grain interior. If the aging temperature is higher than 750 °C, the recrystallization occurs and the disappearance of both effective nuclei and well-aligned precipitates within the grain interior will obviously reduce the specimen's shape memory performance.
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