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Heterogeneous Microstructure Enhanced Comprehensive Mechanical Properties in Titanium Alloys

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Abstract

The design of materials with good strength and ductility is still a challenge to current materials science. Here, we propose a two-step aging method to balance the comprehensive mechanical properties in near-β titanium alloys by designing multiscale α precipitate distribution. Phase-field calculations in Ti-V binary alloys are used to screen the heat treatment process by changing the microstructure. Our calculations show that the coarse α precipitates nucleate near grain boundaries at 650°C first and grow and nucleate to the grain interior with the increase of aging time. The fine α precipitates nucleate and grow in grain after subsequent aging at 550°C, and the whole system shows four different microstructures in grain by changing the aging time, i.e., homogeneous fine α precipitates, coarse α precipitates surrounded by fine α precipitates, fine α precipitates surrounded by coarse α precipitates, and homogeneous coarse α precipitates. Based on this strategy, we design a hierarchical α precipitate microstructure in Ti55531 alloy by two-step aging at 650°C/60 min plus 550°C/180 min, which shows enhanced mechanical properties with the ultimate tensile strength of 1.38 GPa and total elongation of 6%. Our work sheds light on the design of novel Ti alloys with comprehensive strength and ductility properties by heterogeneous microstructure.

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Acknowledgements

We acknowledge the National Key Research and Development Program of China (Grant No. 2016YFB0701302), a project supported by State Key Laboratory of Powder Metallurgy of Central South University, the National Natural Science Foundation of China (Grant Nos. 51671156, 51931004, and 51671158), 111 project (BP2018008), and “H2” High-Performance Cluster, the internal funding from City University of Hong Kong under the Programs 7004894 and 9380060.

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Authors and Affiliations

  1. Center of Microstructure Science, Frontier Institute of Science and Technology, State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, People’s Republic of China

    Mengyuan Hao, Yalong Wang, Pei Li, Tianlong Zhang, Jiaming Zhu & Dong Wang

  2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    Mengyuan Hao & Dong Wang

  3. Department of Materials Science and Engineering, College of Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, People’s Republic of China

    Tianlong Zhang

  4. Thermal Power Research Institute Co. Ltd., Xi’an, 710032, People’s Republic of China

    Pei Li

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  1. Mengyuan Hao
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  2. Yalong Wang
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  3. Pei Li
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  4. Tianlong Zhang
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  5. Jiaming Zhu
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  6. Dong Wang
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Correspondence to Dong Wang.

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Hao, M., Wang, Y., Li, P. et al. Heterogeneous Microstructure Enhanced Comprehensive Mechanical Properties in Titanium Alloys. JOM 73, 3082–3091 (2021). https://doi.org/10.1007/s11837-021-04775-y

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