摘要：

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To develop high efficient and advanced mechanical system, the creation of new materials and associated systems is one of the key directions. This presentation will feature recent development of structural nanomaterials and high mechanical properties of functional nanomaterials for the potential applications in mechanical and energy systems. The mechanisms of nanomaterials processing with different nano-structures by high efficient physical methods will firstly be reported by illustrating our latest findings / research progress on the nanomaterials with high strength and high ductility, nanostructure materials with gradient structure, hierarchical nano-twinned materials, nanomaterials with multiphase embedded structure and the supra-nanostructured materials. We will also present our recent work on an approach that combines the strengthening benefits of nanocrystallinity with those of amorphization to produce a dual phase material that exhibits near-ideal strength at room temperature and without sample size effects. The magnesium-alloy system consists of nanocrystalline cores embedded in amorphous glassy shells, and the strength of the resulting dual-phase material is a near-ideal 3.3 GPa—making this the strongest magnesium alloy thin film yet achieved. This work demonstrates a new way of producing a supra-nanostructure in a controllable manner. We anticipate numerous applications related to the material’s exceptional mechanical properties and other functional properties, for example as biodegradable implants with excellent wear resistance etc. The feasibility of applying different nanomaterials on various advanced robotics, light-weight vehicle and energy systems; such as soft robotics, robotics in challenging environment (nuclear plant), ocean exploration and thermal energy conversion will be discussed. Lastly, the development and research direction of the biomimetic nanostructured materials on advanced unmanned mechanical systems will be presented.

References
[1] J.C.Ye, J.Lu, C.T.Liu, Q.Wang, Y.Yang, Atomistic Free-Volume Zones and Inelastic  Deformation of Metallic-Glasses Characterized by High-Frequency Dynamic Micropillar Tests, Nature Materials, Volume 9, Issue 8, August 2010, pages 619-623.

[2] Q.Wang, C.T.Liu, Y.Yang, Y.D.Dong, J.Lu, Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass, Physical Review Letters, May 2011, Volume 106, Issue 21, N. 215505

[3] H.N.Kou, J.Lu, Y.Li, High-Strength and High-Ductility Nanostructured and Amorphous Metallic Materials, Advanced Materials, 2014, 26, p5518–5524

[4] L.L.Zhu, S.Q.Qu, X.Guo, J.Lu, Analysis of the twin spacing and grain size effects on mechanical properties in hierarchically nanotwinned face-centered cubic metals based on a mechanism-based plasticity model, Journal of the Mechanics and Physics of Solids, Volume:76, Pages:162-179, March 2015

[5] Q.Wang, S.T.Zhang, Y.Yang, Y.D.Dong, C.T.Liu, J.Lu, Unusual fast secondary relaxation in metallic glass, Nature Communications, 24 Jul 2015, DOI: 10.1038/ncomms8876

[6] Y.F.Ye, Q.Wang, J.Lu, C.T.Liu, Y.Yang, High-entropy alloy: challenges and prospects, Materials Today, Volume: 19, Issue: 6, Pages: 349-362, July-August 2016

[7] Y.W.Zhan, S.S.Zeng, H.D.Bian, Z.Li, Z.T.Xu, J.Lu, Y.Y.Li, Bestow metal foams with nanostructured surfaces via a convenient electrochemical method for improved device performance, Nano Research, Volume: 9, Issue: 8, Pages: 2364-2371, Aug. 2016

[8] J.Zhang, L.C.Chan, T.Gao, Q.Wang, S.Zeng, H.Bian, C.Lee, Z.T.Xu, Y.Y.Li, J.Lu, Bulk monolithic electrodes enabled by surface mechanical attrition treatment-facilitated dealloying, Journal of Materials Chemistry A, Vol. 4, Issue: 39, Pages: 15057-15063, Oct. 2016

[9] G.Wu, K.C.Chan, L.L.Zhu, L.G.Sun, J.Lu, Dual-phase nanostructuring as a route to high strength magnesium alloys, Nature, 4th May 2017, Pages:80-83

 

报告人简介:

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Prof. Jian Lu is Chair Professor of Mechanical   Engineering; Vice-President (Research &Technology) and Dean of graduate study at the City University of Hong Kong (CityU). He commenced his undergraduate education in 1978 at Peking University where he was selected based on his score in the national examination for a national scholarship for overseas study in 1979. He obtained the Dip. Ing., Master (DEA) degree and Doctoral degree from University of Technology of Compiegne in 1984 and 1986 respectively. From 1986 to 1994, he was appointed as Senior Research Engineer at the CETIM (French Technical Centre for Mechanical Industry). In 1994, he was appointed as Professor; Head of Department of Mechanical Systems Engineering and Director of Mechanical Systems and Concurrent Engineering Laboratory jointly supported by the French Ministry of Education and CNRS at the University of Technology of Troyes, France. From 2005 to 2010, he was Chair Professor and Head of Department of Mechanical Engineering at the Hong Kong Polytechnic University. From 2010 to 2013, he was the Dean of College of Science and Engineering at CityU. Professor LU’s primary research interest is advanced nanomaterials and its integration in mechanical and biomedical systems using the combination of experimental mechanics and mechanical simulation. He has also branched out into several other areas of interest including surface science and engineering, biomechanics, residual stresses, and mechanics of nanomaterials. He has published more than 350 SCI journal papers including papers in Nature (cover story), Science, Nature Materials, Nature Communications, Materials Today, Advanced Materials, PRL, Acta Materialia, and Journal of the Mechanics and Physics of Solids. He received the French Knight of the National Order of Merit and French Knight of the National Order of Légion d’Honneur in 2006 & 2017 respectively. Both awards were nominated by the President of the Republic of France and awarded by the French Government. He was elected as an academician by the National Academy of Technologies of France in 2011.