摘要
正应力如何影响金属玻璃高温下的变形方式转变目前仍不 清楚. 本文通过同时构建金属玻璃在压缩和拉伸下的变形图, 发现 存在显著的正应力效应, 即拉伸正应力能极大地促进剪切局域化 到均匀变形的转变, 而压缩正应力则可能轻微抑制该转变. 本研究 结果强调了应力状态在金属玻璃高温变形中的关键作用, 并预示 着可通过调整局部应力状态来更好地控制金属玻璃的热塑性成形.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51771205), and Liaoning Revitalization Talents Program (XLYC1808027).
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Zhang Z and Qu R conceived and supervised the study; Wu S performed the experiments and wrote the manuscript with the supports from Qu R, Zhang Z, Zhang H and Zhu Z. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
Shaojie Wu obtained his BSc degree from Xi’an Jiaotong University in 2015. He is currently a PhD student under the supervision of Prof. Zhefeng Zhang and Prof. Ruitao Qu at the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS). His research focuses on the deformation and fracture mechanisms of high-strength materials.
Ruitao Qu is a professor at the School of Materials Science and Engineering, Northwestern Polytechnical University. He received his BSc degree from Xi’an Jiaotong University in 2006, and PhD degree from the IMR, CAS in 2012. He joined the IMR as an assistant professor in 2012 and became an associate professor in 2015. From 2017 to 2019, he worked with Prof. Cynthia A. Volkert at the University of Gottingen as a Humboldt Postdoctoral Researcher. He assumed his present position in 2020. He works in the field of mechanical behaviors of advanced metallic materials with a special focus on their damage mechanics, strength theory and fracture mechanism.
Zhefeng Zhang is a professor at the IMR, CAS. He received his BSc and MSc degrees from Xi’an Jiaotong University in 1992 and 1995, respectively. After receiving his PhD degree in 1998 from the IMR, CAS, he joined the IMR as a research associate. From 2000 to 2001, he worked at the National Institute of Advanced Industrial Science and Technology, Japan as a JSPS (Japan Society for the Promotion of Science) fellow. From 2001 to 2003, he was awarded by Alexander von Humboldt foundation working with Prof. L. Schultz and Prof. J. Eckert at the Institute for Metallic Materials, IFW-Dresden, Germany. He assumed his present position in 2004. His research focuses on the mechanical properties, specically associated with the fatigue and fracture behavior of materials. He has published more than 480 papers in international journals which have been cited more than 13,000 times.
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Wu, S., Qu, R., Zhu, Z. et al. Deformation map of metallic glass: Normal stress effect. Sci. China Mater. 63, 2620–2626 (2020). https://doi.org/10.1007/s40843-020-1454-x
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DOI: https://doi.org/10.1007/s40843-020-1454-x