The Microstructures and Deformation Mechanism of Hetero-Structured Pure Ti under High Strain Rates

The Microstructures and Deformation Mechanism of Hetero-Structured Pure Ti under High Strain Rates Shuaizhuo Wang National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China Haotian Yan National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China Dongmei Zhang National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China Jiajun Hu National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China Yusheng Li National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

This study investigates the microstructures and deformation mechanism of hetero-structured pure Ti under different high strain rates (500 s−1, 1000 s−1, 2000 s−1). It has been observed that, in samples subjected to deformation, the changes in texture are minimal and the rise in temperature is relatively low. Therefore, the influence of these two factors on the deformation mechanism can be disregarded. As the strain rate increases, the dominance of dislocation slip decreases while deformation twinning becomes more prominent. Notably, at a strain rate of 2000 s−1, nanoscale twin lamellae are activated within the grain with a size of 500 nm, which is a rarely observed phenomenon in pure Ti. Additionally, martensitic phase transformation has also been identified. In order to establish a correlation between the stress required for twinning and the grain size, a modified Hall–Petch model is proposed, with the obtained value of Ktwin serving as an effective metric for this relationship. These findings greatly enhance our understanding of the mechanical responses of Ti and broaden the potential applications of Ti in dynamic deformation scenarios.
11 06 2023 7059 ma16217059 National Key Laboratory of Transient Physics Foundation http://dx.doi.org/10.13039/ 6142604220103 Key Program of National Natural Science Foundation of China http://dx.doi.org/10.13039/ 51931003 National Natural Science Foundation of China http://dx.doi.org/10.13039/ 52071180 Projects in Science and Technique Plans of Ningbo City http://dx.doi.org/10.13039/ 2019B10083 https://creativecommons.org/licenses/by/4.0/ 10.3390/ma16217059 https://www.mdpi.com/1996-1944/16/21/7059 https://www.mdpi.com/1996-1944/16/21/7059/pdf Titanium as a Reconstruction and Implant Material in Dentistry: Advantages and Pitfalls Materials 2012 10.3390/ma5091528 5 1528 Konstantinov Ti-B-Based Composite Materials: Properties, Basic Fabrication Methods, and Fields of Application (Review) Compos. Part A Appl. Sci. 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