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Effects of initial microstructure on the aging behavior and subsequent mechanical properties of Ti–Nb–O titanium alloy

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Abstract

Metastable β-type Ti–38Nb–0.2O alloy was subjected to cold rolling (CR) and solution treatment (ST), and the effects of initial microstructure on the aging behavior and subsequent mechanical properties were investigated. High density of dislocations and grain refinement were introduced by CR, which suppressed the ω phase and promoted the α phase in the subsequent aging process. Upon aging at 573 K, the CR specimen consisted of α + β phase and high density of dislocations, while the ST specimen showed homogeneous precipitation of ω phase. Upon aging at 773 K, the CR specimen exhibited ultrafine equiaxed α phase without obvious β grain boundary, while the ST specimen contained acicular α precipitates nonuniformly distributed in the internal grain and grain boundary, and precipitate-free zone near grain boundaries were observed. The different initial microstructures led to large difference in strength and Young’s modulus between the aged specimens.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors gratefully acknowledge the funding of the National Natural Science Foundation of China (NSFC, No. 51671012) and the National Natural Science Foundation of China (NSFC, No.52001018).

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Authors and Affiliations

  1. Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Junshuai Wang, Wenlong Xiao, Yu Fu, Lei Ren, Bo Song & Chaoli Ma

  2. Research Institute for Frontier Science, Beihang University, Beijing, 100191, China

    Cuiyun Liu & Chaoli Ma

  3. Yunnan Innovation Institute of Beihang University, Kunming, 650000, Yunnan, China

    Wenlong Xiao

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  1. Junshuai Wang
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Correspondence to Wenlong Xiao.

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Wang, J., Xiao, W., Fu, Y. et al. Effects of initial microstructure on the aging behavior and subsequent mechanical properties of Ti–Nb–O titanium alloy. Journal of Materials Research 37, 2304–2313 (2022). https://doi.org/10.1557/s43578-022-00631-0

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