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

0710957 Lewandowski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工程系John Lewandowski博士与埃及开罗艾因夏姆斯大学阿德尔El-Shabasy博士合作进行的合作研究。 他们计划研究非晶金属箔和层压板的加工和机械性能。 将通过光学显微镜、扫描电子显微镜和透射电子显微镜评价微观结构和断裂形态。这项工作的主要目标是表征和理解的因素，有助于强度，韧性和疲劳行为，以期提高其韧性。将使用AF 163 -2K环氧树脂（由3 M Co.作为粘合材料。将测定经处理的层压材料的韧性。 如果自层压材料没有表现出改善的韧性，则将考虑与另一种韧性箔材料层压。还将对某些层压板进行疲劳试验，以确定此类层压板对循环性能的影响。 这些材料在完全反向条件下的疲劳性能将使用在电子工业薄膜疲劳性能评估中成功使用的设备来确定。 此外，将对这些箔进行拉伸和缺口韧性测试，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）基金属玻璃箔的多种机械性能，包括其强度、断裂韧性和疲劳行为。 已知非晶材料，例如具有无序非结晶性的金属玻璃，具有异常高的强度、弹性模量和显微硬度沿着上级的耐磨性和耐腐蚀性，但是它们的拉伸延展性和断裂韧性极差，导致在拉伸载荷下的脆性失效。 铁基非晶合金的延展性需要提高才能在工程上得到成功应用。 该项目可以通过控制微观结构和层压板的形成来提高延性。 结果应有助于确定有助于改善性能的因素。这项工作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使用。在许多工程应用中，这些可能会受到疲劳载荷。超高的强度和均匀的化学成分使其具有良好的耐环境侵蚀和耐疲劳性能。然而，众所周知，块体材料的疲劳特性不能用于小尺度结构。因此，目前尚不清楚当这些材料的尺寸减小时它们将如何表现。 该项目涉及一个特殊的非晶合金家族，可在箔的形式将有助于使用这些材料在许多独特的应用，需要上级机械性能。两个合作组织都有足够的资源来完成拟议的任务。该项目得到了美国-埃及联合基金计划的支持，该计划为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.