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

莱万多夫斯基描述：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约翰·莱万多夫斯基博士与埃及开罗艾因沙姆斯大学Adel El-Shabasy博士的合作研究。他们计划研究非晶态金属箔和层压板的加工和机械性能。用光学显微镜、扫描电子显微镜和透射电子显微镜对材料的微观结构和断口形貌进行了分析。这项工作的主要目标是表征和了解影响强度、韧性和疲劳行为的因素，以期提高它们的韧性。一种简单的自层压技术将使用AF163-2K环氧树脂(由3M公司生产)。作为粘结材料。将测定经过处理的层压板的韧性。如果自层压板没有表现出更好的韧性，将考虑用另一种延性箔材料进行层压。还将对一些层压板进行疲劳试验，以确定这种层压板对循环性能的影响。这些材料在完全相反的条件下的疲劳性能将使用在电子工业薄膜疲劳行为评估中成功使用的设备来确定。此外，还将对这些箔进行拉伸和缺口韧性测试，以确定它们的初始机械性能。智力影响：该项目旨在使用最先进的方法评估铁(Fe)基金属玻璃箔的各种机械性能，包括它们的强度、断裂韧性和疲劳行为。非晶态材料，如具有无序非结晶性的金属玻璃，具有异常高的强度、弹性模数和显微硬度以及优异的耐磨性和耐腐蚀性，但它们的拉伸延展性和断裂韧性极差，导致在拉伸载荷下发生脆性破坏。为了成功的工程应用，铁基金属玻璃的延展性需要得到提高。该项目可以通过控制微观组织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。这项工作各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加以利用。在许多工程应用中，这些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疲劳的可能性。然而，众所周知，散体材料的疲劳特性不能用于小规模结构。因此，目前还不清楚当这些材料的尺寸减小时，它们会有什么表现。该项目涉及一种特殊的非晶态合金家族，这种合金以箔的形式提供，将有助于将这些材料用于许多需要优异机械性能的独特应用中。这两个协作组织都有足够的资源来完成拟议的任务。私人投资机构过去曾进行过互动，因此预计这一项目将取得很大成就。该项目由美国-埃及联合基金计划支持，该计划为两国的科学家和工程师提供资助，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.