Materials World Network: Interaction of Time- and Load-History Dependent Degradation of Multilayered Materials Subjected to High Temperatures

这是特拉华州大学（美国）、波鸿大学（德国）和德国航空航天中心（DLR，德国）之间的一项国际研究合作，研究具有不同材料界面的材料系统的高温响应。 了解此类系统的高温响应对许多应用具有重要影响，从隔热涂层等高温材料到新一代电子元件，例如纳米/微机电系统（N/MEMS）。 多材料系统表现出与时间和温度相关的材料演化，例如相的相互扩散、沉淀和溶解，沿着在高温下的化学反应。 除了这种复杂的材料演变，大多数高温应用都受到热和机械循环载荷的影响。 时间依赖性过程和循环荷载引起的退化之间的相互作用是高度非线性的。 因此，它是难以使用的加速测试的寿命评估在现实的负载条件下，以及在实验室环境中再现现实的负载谱和现实的时间尺度的共同的方法。 这项工作的目的是开发一个相结合的实验和数值技术的加速测试和寿命预测的材料系统与界面的不同材料受到高温。 三个组织的互补专长提供了一个独特的协同研究环境，使研究目标得以实现。 该提案的一个主要的更广泛的影响在于一个重要的教育组成部分，包括涉及大约五名本科生，特别是来自研究中代表性不足的群体。 此外，该项目的一个关键部分是跨大西洋的学生交流，其中两名来自特拉华州大学的研究生在德国的最先进的研究实验室各花了六个月。 德国同行的互访加强了国际经验。该奖项由国际科学与工程办公室共同资助。

This is an international research collaboration between the University of Delaware (USA), the University of Bochum (Germany), and the German Aerospace Center (DLR, Germany), investigating the high temperature response of material systems with interfaces of dissimilar materials. Understanding the high temperature response for such systems has important implications on many applications, ranging from high temperature materials such as thermal barrier coatings, to the new generations of electronic components, such as Nano/Micro-Electro-Mechanical Systems (N/MEMS). Multi-material systems exhibit time and temperature dependent materials evolution, such as interdiffusion, precipitating and dissolution of phases, along with chemical reactions at elevated temperatures. In addition to such complex material evolution, most high temperature applications are subjected to both thermal and mechanical cyclic loading. The interaction between the time-dependent processes and the degradation due to cyclic loads is highly non-linear. Thus, it is difficult to use common approaches of accelerated testing for lifetime assessment under realistic loading conditions, as well as reproducing realistic load spectra and realistic time scales in a laboratory environment. This work aims to develop a combined experimental and numerical technique for accelerated testing and life-time prediction of material systems with interfaces of dissimilar materials subjected to high temperatures. Complementary expertise from the three organizations provides a unique synergistic research environment, enabling the research goals to be reached. A major broader impact of the proposal lies within a significant education component, including involving about five undergraduate students in particular from underrepresented groups in the research. Furthermore, a key part of the project is a transatlantic student exchange, where two graduate students from the University of Delaware spend up to six months each at state-of-the-art research laboratories in Germany. Reciprocal visits from the German counterparts enhance the international experience. This award is co-funded with the Office of International Science and Engineering.