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Effect of Cold Compression Deformation and Aging Treatment on the Microstructure and Properties of Ti-15-3 Titanium Alloy

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Abstract

The microstructure evolution of Ti-15-3 (Ti-15Mo-3Al-2.7Nb-0.2Si) titanium alloy after cold deformation and aging treatment was observed and analyzed using OM, SEM, XRD and TEM, and the Rockwell hardness of the alloy was measured. The results showed that there was no phase transformation of the alloy during cold deformation. At 20% deformation, the cold deformation mechanism of the alloy was dominated by dislocation movement and accretion, and many slip bands formed. As the amount of deformation increased, dislocations and slip bands continued to merge and decrease in number, the deformation mechanism of the alloy gradually converted to grain torsion and shear band deformation, and the lattice of the alloy gradually rotated toward < 011 > . After aging, a dense and uniform distribution of fine needle-like α phases precipitated in the cold-formed alloy. Most of the α phases were aligned parallel, with a few cross-aligned phases, and there was a very good co-lattice relationships between the α phases and the beta matrix, which contributed to the performance of the alloy. Overall, increasing deformation facilitated precipitation and growth of the α phase, and cold deformation combined with aging treatment significantly increased the strength of the alloy.

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Acknowledgments

This work was supported by the Young Innovative Talents Project of Colleges and Universities in Guangdong Province (2021KQNCX128, 2022KQNCX129), the Characteristic Innovation Projects of Colleges and Universities in Guangdong Province (2021KTSCX156) and the Guangdong Technology College Innovation and Strengthening School Project (2021GKJZK024).

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  1. Faculty of Intelligent Manufacturing, Guangdong Technology College, Zhaoqing, 526100, Guangdong, China

    Longhong Dan, Linghao Wang, Zhiyong Li & Ruo Mo

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Dan, L., Wang, L., Li, Z. et al. Effect of Cold Compression Deformation and Aging Treatment on the Microstructure and Properties of Ti-15-3 Titanium Alloy. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-09073-z

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