Resume and Abstract of the Lecture-Prof. Yongjun Tian
Resume: Yongjun Tian is Professor of College of Materials Science and Engineering, Yanshan University. He was born in 1963, and received his Ph.D. at Institute of Physics, Chinese Academy of Science. He was hired as a Cheung Kong Scholar Professor in 2001, awarded the National Outstanding Young Scientist Fund in 2002, and elected to the Chinese Academy of Sciences in 2017. He received several awards including Second National Natural Science Award of China (2011), Tan Kah Kee Science Award (2018) and First Natural Science Awards of Chinese Ministry of Education (2000 and 2008).
Progress and Prospects of Nanostructured Superhard Materials
In superhard materials research, two topics are of central focus. One is to understand hardness microscopically and to establish hardness models with the parameters calculated by first principles calculation, which can be used to guide the design or prediction of novel superhard crystals. The other is to synthesize superhard polycrystalline materials with enhanced comprehensive performance (i.e., hardness, fracture toughness, and thermal stability), with the ambition of achieving bulk materials harder than natural diamond. In this talk, I will discuss the microscopic hardness models of covalent crystals and its generalization to polycrystalline covalent materials. After that, I will discuss the nanotwinning approach for high-performance superhard materials, with special focus on nanotwinned cBN and diamond. I will conclude this talk with a discussion of challenges and future developments in superhard materials.
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