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

技术性：本项目是先前资助项目（DMR-0206826）的续期。某些合金和层状复合材料的加工和制造非常昂贵，因为与这些材料的现有加工技术相关的复杂方法。包括钛在内的活性金属就是一个很好的例子。它们很难在熔融状态下加工，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。之前的研究为冷轧辊粘合/反应退火作为二元Ti/Al金属间材料的简单加工技术提供了重要信息。虽然已经开发了一种简单、耗时更少的金属间材料加工方法，但要充分了解影响该工艺的所有参数，还需要做更多的工作。例如，人们已经知道，金属在轧制过程中会产生纹理。然而，先前的研究并没有解决纹理对加工的影响。此外，有必要深入研究多次冷轧结合严重变形对超细晶粒组织发展的影响。此外，PI的初步工作表明，在之前的拨款中开发的用于加工二元Ti/Al金属间材料的技术有望成功加工三元金属间材料，主要是Ti-Al- nb系统。在之前的拨款中开发的模型只考虑了多层双金属复合材料。本课程的具体目标是：1。Ti-Al-Nb三元板材冷轧结合/反应退火工艺的开发与优化。2. 测定织构和超细晶粒组织对加工板材组织和力学性能的影响。3. 修改现有的冷轧辊粘合模型，以适应三种不同类型的元素板。非技术：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（密度低），在高温（1100℃）下仍能保持高强度。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是其在工业中缺乏广泛应用的部分原因。研究将为进一步发展冷轧结合/反应退火作为先进金属和材料的简单加工技术提供重要信息。这项技术可以扩大规模，以制造大块的Ti/Al/Nb金属间化合物，以及其他金属间化合物，可用于制造各种物品，用于海洋，航空航天，结构和高温应用。通过开发这种简单，耗时更少的加工方法，这些材料的生产成本将大大降低。该技术可能会对目前使用现有或传统技术处理过于困难或过于昂贵的合金系统产生重大影响。这可能会导致金属间化合物和许多其他合金体系的实际应用和进一步发展的显著增加。该研究的建模部分将导致几种不同类型的薄金属箔的滚轧组合的预测方法。该项目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.