Abstract
Systematic microstructural investigations reveal that heterogeneous duplex structure in Ti–Sn and Ti–Sn–Fe alloys consisting of an array of Ti 3Sn plates surrounding the duplex colony and ultrafine twin results from solid-state decomposition of supersaturated β-Ti into α-Ti + Ti 3Sn phases. Moreover, small addition of Fe into the Ti 82Sn 18 duplex alloy has a strong influence to refine the twinning in the Ti 3Sn phase and interlayer spacing of the duplex structure. Such microstructural heterogeneities are effective to enhance both strength and plasticity at room temperature. Based on these results, it is possible to design the unique ultrafine duplex structure with high strength and large plasticity together by introducing the solid-state phase transformation-induced heterogeneity.
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