U.S.-Egypt Cooperative Research: Processing and Mechanical Properties of Amorphous Metal Foil and Laminates

项目描述：该项目支持俄亥俄州克利夫兰凯斯西储大学材料科学与工程系的John Lewandowski博士与埃及开罗艾因沙姆斯大学的Adel El-Shabasy博士的合作研究。他们计划研究非晶金属箔和层压板的加工和机械性能。显微组织和断口形貌将通过光学、扫描电子和透射电子显微镜进行评估。这项工作的主要目标是描述和理解影响强度、韧性和疲劳行为的因素，以期提高其韧性。使用AF163-2K环氧树脂（3M公司生产）作为粘合材料，采用一种简单的自层压技术。加工后的层压板的韧性将被确定。如果自层压板没有表现出改善的韧性，将考虑与另一种延展性箔材料层压。还将对一些层压板进行疲劳试验，以确定这种层压对循环性能的影响。这些材料在完全相反的条件下的疲劳性能将通过在电子工业中成功用于薄膜疲劳行为评估的设备来确定。此外，将对这些箔进行张力和缺口韧性测试，以确定其初始机械性能。智力影响：该项目旨在使用最先进的方法评估铁（Fe）基金属玻璃箔的众多机械性能，包括强度、断裂韧性和疲劳行为。非晶态材料，如无序非晶态金属玻璃，具有异常高的强度、弹性模量和显微硬度，以及优异的耐磨损和耐腐蚀性能，但其拉伸延展性和断裂韧性极差，导致拉伸载荷下脆性破坏。铁基金属玻璃的延展性需要进一步提高才能成功地在工程上应用。该项目可以通过控制微结构和层合板的形成来提高延性。结果应该有助于确定有助于改善性能的因素。这项工作的各个方面的成功完成将导致在小型结构中更多地使用这种材料。更广泛的影响：金属玻璃箔提供了一组有趣的特性，可以在各种微系统中利用。在许多工程应用中，这些材料可能会受到疲劳载荷的影响。超高强度和基本均匀的化学成分提供了良好的抗环境侵蚀和抗疲劳的可能性。然而，同样众所周知的是，块状材料的疲劳性能不能用于小规模结构。因此，目前尚不清楚这些材料在尺寸减小时的表现。该项目涉及一种特殊的非晶合金家族，这种合金以箔的形式存在，将有助于在许多需要卓越机械性能的独特应用中使用这些材料。两个协作组织都有足够的资源来完成所提议的任务。在过去，pi已经相互作用，因此预计在这个项目下可以完成很多工作。该项目得到了美国-埃及联合基金项目的支持，该项目向两国的科学家和工程师提供赠款，以开展这些合作活动。

0710957LewandowskiDescription: This project supports collaborative research by Dr. John Lewandowski, Department of Materials Science & Engineering, Case Western Reserve University, Cleveland, Ohio in collaboration with Dr. with Adel El-Shabasy, Ain Shams University, Cairo, Egypt. They plan to study the processing and mechanical properties of amorphous metal foil and laminates. The microstructures and the fracture morphology will be evaluated by optical, scanning electron, and transmission electron microscopy. The main objectives of this work are to characterize and understand the factors contributing to the strength, toughness, and fatigue behavior, with a view towards improving their toughness. A simple technique of self-lamination will be applied using AF163-2K epoxy (produced by 3M Co.) as a bonding material. The toughness of the processed laminates will be determined. If the self-laminates do not exhibit improved toughness, lamination with another ductile foil material will be considered. Fatigue tests will also be conducted on some of the laminates in order to determine the effects of such lamination on cyclic performance. The fatigue properties of these materials under fully reversed conditions will be determined using equipment successfully used in the evaluation of the fatigue behavior of thin membranes for the electronics industry. In addition, tension and notch toughness tests will be carried out on these foils to identify their initial mechanical properties. Intellectual impact: This project is aimed at evaluating numerous mechanical properties of iron (Fe)-based metallic glass foils, including their strength, fracture toughness, and fatigue behavior using state-of-the-art methods. Amorphous materials, such as metallic glasses having disordered non-crystallinity, are known to possess unusually high strength, elastic modulus, and microhardness along with superior wear and corrosion resistance, but their tensile ductility and fracture toughness are extremely poor, leading to brittle failures under tensile loading. The ductility of Fe-based metallic glasses needs to be enhanced for successful engineering applications. The project can lead to enhancing the ductility through control of microstructures and formation of laminates. Results should help identify the factors that contribute towards improving properties. Successful completion of various aspects of this work will lead to increased use of such materials in small-scale structures. Broader impact: Metallic glass foils provide an interesting set of properties that may be exploited in various microsystems. These may be subjected to fatigue loading in numerous engineering applications. The ultra-high strength and generally homogenous chemical composition provide the possibility of good resistance to environmental attack and fatigue. However, it is also well known that the fatigue properties of a bulk material cannot be adopted for small-scale structures. Thus, it is not clear how such materials will behave when their dimensions are reduced. The project dealing with a particular amorphous alloy family that is available in foil form will help in using these materials in many unique applications that require superior mechanical properties. Both collaborating organizations have adequate resources to complete the proposed tasks. The PIs have interacted in past and therefore it is expected that much can be accomplished under this project.This project is being supported under the US-Egypt Joint Fund Program, which provides grants to scientists and engineers in both countries to carry out these cooperative activities.