Abstract
Achieving damage tolerance in structural materials can be challenging due to the need for both high strength and ductility, which are typically incompatible properties. The common post-processing techniques in thermomechanical machining enable us to fabricate metal materials with distinctive microstructures, thereby enhancing the mechanical properties of the materials. We show that a hierarchical-structured titanium (HST) alloy consisting of belt-like α phase (αb), submicron-scaled oval α phase (αo), and nano-scaled secondary α phase (αs) has been designed by employing precision and user-friendly process routes. The hierarchical microstructure performs high strength while preserving respectable ductility. The ultrahigh strength (σYS∼1257 MPa and σUTS∼1411 MPa)) can be mainly attributed to the grain boundary strengthening served by hierarchical α phase. Moreover, the unique architecture provides excellent resistance to crack propagation, obtaining a large ductility (20%), making it a highly promising structural material for engineering applications.
Published Version
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