Abstract
The present work investigates the microstructural evolution and β-phase stability of a multi-component [(Mo,Sn)-(Ti,Zr)14]-Nb alloy series developed using the cluster-plus-glue-atom model. Low Young’s modulus (E) can be reached, when both low-E elements, Sn and Zr, and β-Ti stabilizers, Mo and Nb, are properly incorporated in the so-called cluster formulas. After the X-ray diffraction and transmission electron microscopy analysis, and in combination with the β-Ti stability measured by the Mo equivalent, the Young’s modulus of β-Ti alloys is found to increase with increasing β stabilities and is closely related to both the microstructures of the β matrix and the precipitated phases. More importantly, the morphologies of the β matrix change with β stabilities apparently so that high-E (E >70 GPa) and low-E (E ≤70 GPa) β-Ti alloys can be distinguished with the microstructures of the β matrix. The quinary alloy, formulated as [(Mo0.5Sn0.5)-(Ti13Zr1)]Nb1, owns its lowest E of 48 GPa among the present alloy series to the mixed thin-lamellar and rod-shaped morphology of the β structure with the lowest stability for the β formation.
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Acknowledgments
This work was financially supported by the National Natural Science Foundations of China (Nos. 51171035, 11174044, and 51131002), the International Science & Technology Cooperation Program of China (No. 2015DFR60370), and the Fundamental Research Funds for the Central Universities (No. DUT14LAB12).
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Manuscript submitted October 4, 2014.
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Wang, Q., Li, Q., Li, X. et al. Microstructures and Stability Origins of β-(Ti,Zr)-(Mo,Sn)-Nb Alloys with Low Young’s Modulus. Metall Mater Trans A 46, 3924–3931 (2015). https://doi.org/10.1007/s11661-015-3011-4
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DOI: https://doi.org/10.1007/s11661-015-3011-4