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  • [April 18, 2017]

    Nano to Bulk- Crossing the Valley

  • Speaker:
    Yinong Liu
    Date:
    Tuesday, April 18, 2017
    Time:
    11:00am
    Location:
    Room 434, Mechanics Building
    Host:
    Yufeng Zheng
  • Abstract
  • Nanomaterials are known to exhibit exceptional properties approaching their theoretical limits. It has always been a challenge to us to make use of these exceptional properties in bulk forms for practical application. All efforts in the past have led to no success. This situation is commonly known as the “valley of death” in composite materials design.

    This talk presents a new strategy based on the principle of lattice strain matching and collective atomic load transfer developed in a recent study. The strategy utilizes a phase transforming metal matrix to composite with nanomaterials, and by doing so is able to induce ultra large elastic strains of over 6% and to achieve ultra high strengths of over 6 GPa in the nanoinclusions. This is a breakthrough to the long-standing challenge of the “valley of death” in composite design.
    The implication of the findings, in particular the generation of ultra-large elastic strains in solids, is much more far-reaching than achieving high strength. By imposing ultra-large elastic strains to solids, thus to alter their valence electron states, it is possible to alter the many functional properties of materials, such as magnetic, electronic, superconducting, photonic, catalytic and chemical sensing characteristics. This is an emerging frontier research, known as “elastic strain engineering”. In this seminar I will also report briefly our preliminary study in superconductivity of our nanocomposites using the concept of lattice strain matching in “elastic strain engineering”.

  • Biography
  • Prof. Yinong Liu obtained his PhD in 1991 from the University of Western Australia (UWA). He then worked as an Australia-France Postdoctoral Fellow at the Institut National Polytechnique de Grenoble in 1993 before returning to Australia in 1994 to start his academic career. He is now Winthrop Professor of Materials Engineering at UWA. He has worked in a number of universities outside Australia as adjunct and honorary professors, including University of Tsukuba, Universite Joseph Fourier, University de Grenoble, Katholieke Universiteit Leuven, Harbin Engineering University, Beijing University of Technology, China University of Petroleum, and Japan Society for Promotion of Science. He has served as the inaugural Chair of the National Committee of Nanoengineering of Engineers Australia and is currently a member of College of Experts of the Australia Research Council. He is an associate editor of the journal of Shape Memory and Superelasticity, Associate Editor of Functional Materials Letters, and a member of the editorial boards of three other international journals. His main research areas include shape memory alloys, magnetic materials, thin film materials for MEMS applications, and functional nanomaterials.