Development of a Simplistic Method for Processing Intermetallic Sheet Materials Using Cold Roll Bonding and Reaction Annealing

技术：该计划是以前资助的计划(dmr-0206826)的续订。某些合金和层状复合材料的加工和制造成本高得惊人，因为这些材料的现有加工技术涉及复杂的方法。包括钛在内的活性金属就是一个很好的例子。它们在熔融状态下很难加工，因为它们与坩埚衬里以及空气中的氧和氮发生反应，因此必须使用真空系统和水冷坩埚来生产钛和钛合金锭。其他难以用传统技术加工的材料是金属间化合物。上一次资助的研究为冷轧结合/反应退火法作为一种简化的二元钛/铝金属间化合物板材加工技术提供了重要信息。虽然已经为金属间化合物板材开发了一种简单、耗时较少的加工方法，但要完全理解影响该过程的所有参数，还需要做更多的工作。例如，已知织构在金属中作为轧制的函数而发展。然而，之前的研究没有讨论质地对加工的影响。此外，有必要深入研究多次冷轧焊接的严重变形对超细晶组织发展的影响。此外，PI的初步工作表明，前一笔赠款中开发的用于处理二元Ti/Al金属间化合物材料的技术有望成功地处理三元金属间化合物材料，主要是Ti-Al-Nb系统。在上一次拨款中开发的模型只考虑了多层双金属复合材料。本项目的具体目标是：1.开发和优化用于制备三元Ti-Al-Nb薄板材料的冷轧/反应退火工艺。2.确定织构和超细晶组织对板材组织和力学性能的影响。3.修改现有的冷轧模型，以适应三种不同类型的元素板。非技术性：作为一类材料，金属间化合物和合金具有很高的技术价值，因为它们重量轻(低密度)，并在高温(1100℃)下保持高强度水平。金属间化合物在许多航空航天、结构和高温应用中具有相当大的潜力。然而，在具有成本效益的加工技术方面缺乏突破，这在一定程度上导致了它们在工业上没有广泛使用。研究将为进一步发展冷轧结合/反应退火法作为一种先进金属和材料的简化加工技术提供重要信息。这项技术可以放大以制造大片的Ti/Al/Nb金属间化合物以及其他金属间化合物，可用于制造各种用于海洋、航空航天、结构和高温应用的物品。通过开发这种简单、耗时较少的加工方法，这些材料的生产成本将显著降低。这项技术可能会对目前使用现有或传统技术加工过于困难或过于昂贵的合金系统产生重大影响。这可能导致金属间化合物以及许多其他合金系统的实际应用和进一步发展的显著增加。这项研究的建模部分应该导致几种不同类型的薄金属箔的多种组合的滚压的预测方法。该计划还将引导研究生和本科生的教学和培训。

TECHNICAL: This program is a renewal of a previously funded program (DMR-0206826). The processing and fabrication of certain alloys and layered composites are inordinately expensive because of the sophisticated methodologies associated with existing processing techniques for these materials. The reactive metals including titanium are a prime example. They are difficult to process in the molten state because they react with crucible linings, as well as with oxygen and nitrogen in air, therefore vacuum systems and water-cooled crucibles must be used to produce titanium and titanium alloy ingots. Other materials that are difficult to process by conventional techniques are the intermetallic compounds. The research from the previous grant has provided vital information for cold roll bonding/reaction annealing as a simplistic processing technique for binary Ti/Al intermetallic sheet materials. Although a simple, less time consuming processing method, for intermetallic sheet materials has been developed, much more work is required to fully understand all of the parameters that affect the process. For example, texture has been known to develop in metals as a function of rolling. However, the previous study did not address the effects of texture on processing. In addition, an in-depth study of the effects of the development of ultra-fine grain structures as a result of severe deformation from multiple cold roll bonding is necessary. Also, preliminary work by the PI has shown that the technique developed in the previous grant for processing binary Ti/Al intermetallic materials has promise for successfully processing ternary intermetallic materials, primarily the Ti-Al-Nb system. The model developed in the previous grant only considered multi-layered bi-metal composites. Specific objectives of this program are: 1. Development and optimization of the cold roll bonding/reaction annealing process for making ternary Ti-Al-Nb sheet materials. 2. Determination of the effects of texture and ultra-fine grain structure on the microstructure and mechanical properties of the processed sheet. 3. Modify the existing model for cold roll bonding to accommodate three different types of elemental sheets. NON-TECHNICAL: As a class of materials, intermetallic compounds and alloys are of high technological interest because they are light in weight (low density) and maintain high strength levels at elevated temperatures (1100 C). Intermetallics have considerable potential in numerous aerospace, structural, and high temperature applications. However, the lack of breakthroughs in cost-effective processing techniques are partially responsible for the lack of their wide spread use in industry. Research will provide vital information for the further development of cold roll bonding/reaction annealing as a simplistic processing technique for advanced metals and materials. This technique can be scaled-up to create large sheets of Ti/Al/Nb intermetallics, as well as other intermetallics, which can be used to fabricate various items for marine, aerospace, structural and high temperature applications. By developing this simple, less time consuming processing method, production costs for these materials will be decreased significantly. The technique can potentially have a significant impact on alloy systems that are presently too difficult or too expensive to process using existing, or conventional techniques. It could lead to a significant increase in the practical applications and further development of intermetallic compounds in addition to numerous other alloy systems. The modeling component of the research should lead to predictive methods for roll bonging numerous combinations of several different types of thin metallic foils. The program will also lead to the teaching and training of graduate students and undergraduate students.