“创源”科技学术论坛——Nanodomain Engineering – Making Smart Materials Smarter
讲座名称：
“创源”科技学术论坛——Nanodomain Engineering – Making Smart Materials Smarter
讲座时间：
2015-04-14
讲座人：
王云志
形式：
校区：
兴庆校区
实践学分：
讲座内容：
第九届西安交通大学“创源”科技学术论坛
前沿院前沿讲坛专场
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报告题目:Nanodomain Engineering – Making Smart Materials Smarter
纳米畴工程—让智能材料更加智能
报 告 人:王云志 教授
报告时间 :2015年4月14日（周二）晚19:00
报告地点 :主楼 A-203
讲座内容简介：
The unique properties of an important class of smart materials, the ferroics, originate from structural phase transformations with symmetry breaking that produce self-accommodating polydomain structures. Sensing and actuation can be realized simultaneously through domain switching under external fields. Familiar examples include ferroelectrics, ferromagnetics and shape memory alloys, transformation toughened ceramics, and artificial muscles. Even though the micro-domain structures in various ferroic systems have been studied for over a century, the properties of their nano-domain counterparts have not yet been explored till recently. Using ferroelastic systems as an example we show in this presentation how to utilize defect engineering to “break” the long-range ordered polytwin domain structure into randomly distributed nano-domains, and render the martensitic transformation (MT) continuous. In particular we demonstrate that such an apparently continuous MT and unique microstructural state do have a rich variety of unique properties, including superelasticity of nearly zero hysteresis, nearly zero thermal expansion (Invar anomaly), and low and nearly temperature-independent elastic modulus (Elinvar anomaly) over a wide temperature range. These findings not only allow us to solve some long-standing puzzles, but also open a new avenue for the development of revolutionary new concepts and new design strategies for the next generation of smart nano-structured materials for a wide range of technological applications.
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主办：研究生院\校团委\学工部
承办：研究生会\博士生协会
协办：前沿科学技术研究院前沿讲坛\通讯社
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