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The 328th forum: Introduction of a new family of materials: supra-nanostructured metals

Date: 2018-05-04
Time: 14:00
Venue: 中科院物理所M楼236报告厅
Speaker: Prof. Jian LU

Centre for Advanced Structural Materials (CASM), City University of Hong Kong

Biography: 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. He has published more than 360 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. He was elected as an academician by the National Academy of Technologies of France in 2011.

The mechanisms of materials formation with different nano-structures by high efficient physical method will firstly be reported by illustrating our latest findings / research progress on the hierarchical nano-twinned materials, supra-nanostructured materials with multiphase embedded structure, etc. We will present our recent work on an approach that combines the strengthening benefits of nanocrystallinity with those of amorphization to produce a dual phase material with domains size smaller than <6nm for both phases. This new family of materials exhibits near-ideal strength at room temperature and without sample size effects. The concept can be extended to many other metallic alloys with exceptional physical and chemical properties. 
[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, pages 619-623, August 2010
[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] 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
[5] 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
[6] Q.Wang, J.J.Liu, Y.F.Ye, T.T.Liu, S.Wang, C.T.Liu, J.Lu, Y.Yang, Universal secondary relaxation and unusual brittle-to-ductile transition in metallic glasses, Materials Today, Vol.: 20, Issue: 6, July-August 2017, Pages: 293-300
[7] 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

邀 请 人:汪卫华(电话:8264 9198)
联 系 人:李园园(电话:8264 9364)