High temperature mechanical performance of metallic and metal-ceramic
讲座名称：
High temperature mechanical performance of metallic and metal-ceramic
讲座时间：
2016-05-06
讲座人：
Javier Llorca
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应材料学院孙军教授邀请，西班牙IMDEA材料研究所所长Javier Llorca教授将于2016年5月6日访问材料学院并作相关金属/陶瓷纳米多层膜高温力学性能的学术报告。
报告时间：5月6日 (本周五) 上午10:00-12:00
报告地点：材料学院210会议室
报告题目：High temperature mechanical performance of metallic and metal-ceramic nanoscale multilayers
报告摘要：Nanoscale multilayers or nanolaminates are nanostructured materials made up by alternating layers of two or more materials with a layer thickness below ~100 nm. Different layered combinations can be found (metal-metal, metal-ceramic and ceramic-ceramic) offering unique mechanical, optical, magnetic and electronic properties suitable for different applications. In addition, the thermo-mechanical properties of the multilayers constitute a key factor, either from the functional perspective or from the reliability viewpoint. These nanolaminates present outstanding mechanical properties at ambient temperature in terms of strength, toughness and fatigue resistance as well as excellent thermal stability. Nevertheless, their high temperature mechanical properties have been unknown until the recent experimental development of high temperature nanomechanics.
In this talk, the mechanisms of deformation and fracture are studied in detail as a function of temperature by means of high temperature nanoindentation and micropillar compression in three different nanoscale multilayer systems (Cu/Nb, Zr/Nb and Al/SiC). The influence of the interface character, diffusion, oxidation as well as the thermal activation of plastic deformation mechanisms on the mechanical properties of each system was ascertained. This information is critical for the design of novel metal-metal and metal-ceramic nanolaminates with enhanced mechanical properties under different regimes.
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