Abstract
Metastable β titanium alloy with bi-modal structure usually exhibits excellent Strength–ductility combination. However, the origin of this improved mechanical properties on the dislocation level has not been thoroughly investigated. An improved Strength–ductility combination is exhibited in a metastable β titanium alloy Ti-5Al-4Zr-8Mo-7V with bi-modal structure. High ultimate tensile strength (UTS) ~ 1390 MPa with considerable elongation ~ 10.2% is acquired. A novel core-shell structure in primary α was found for the first time to our knowledge during tensile deformation. High density of geometrically necessary dislocations consisting of pyramidal a + c type and a type dislocation is displayed in the hard-shell layer, while low density of statistically stored dislocations consisting of a type dislocation is exhibited in the core area. The improved ductility originates from this core-shell structure. The hard shell improves the plastic compatibility between soft primary α and hard transformed β matrix, which alleviates stress concentration and postpones crack nucleation along primary α phase (αp)/β matrix interface. Meanwhile, the soft core sustains uniform deformation effectively, which ensures the ductility. In addition, the origin of high strength is attributed to fine-scale α platelets (αs) with highly defected substructure.
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Acknowledgements
The authors thank Engineer Fang Song at Instrumental Analysis Center, Xi’an University of Architecture and Technology, for her help with SEM/EBSD characterization. We appreciate the support from BAOTI Group Co., Ltd., for material preparation and processing. This work was supported by the National Natural Science Foundation of China (grant nos. 52275161, 52201134) and International Science and Technology Cooperation Projects of Shaanxi Province, China (grant no. 2021KW27).
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Zhu, W., Zhang, P., He, Y. et al. Microstructural Analysis of the Improved Strength–Ductility Combination in Titanium Alloy with Bi-modal Structure. JOM 76, 1659–1668 (2024). https://doi.org/10.1007/s11837-023-06013-z
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DOI: https://doi.org/10.1007/s11837-023-06013-z