Novel Low-Cost 3-D Continuously Reinforced Metal Matrix Composites

9361110谢尔曼 在这个第一阶段计划中，Ultramet提出研究一种创新的新型材料，这种材料应提供显着增加的强度，模量和耐磨性，同时保持高温机械性能。 所提出的概念利用通过化学气相沉积（CVD）制造的陶瓷泡沫作为用于由互穿的连续金属相和陶瓷相组成的金属基质复合材料的高强度互连三维连续增强体，充分利用每相的期望性能，同时消除每相的固有缺点，例如陶瓷的低温脆性和金属的高温蠕变和磨损。 拟议的调查涵盖了陶瓷泡沫增强铝基金属基体的建模，制造，表征和测试，并为进一步的调查和发展提供了基础。 材料成分，增强结构和体积分数，加工（熔体渗透）条件对微观结构和弯曲，拉伸和加工（熔体渗透）条件对这些独特的复合材料的微观结构和弯曲，拉伸和冲击性能的影响将进行研究。 还将生成有限的设计信息，例如物理性能、机械性能（强度和模量）以及热疲劳和抗热震性。

9361110 Sherman In this Phase I program, Ultramet proposes to investigate an innovative new class of materials which should provide dramatically increased strength, modulus, and wear resistance while maintaining mechanical properties to high temperature. The proposed concept utilizes ceramic foams, fabricated by chemical vapor deposition (CVD), as high-strength interconnected three-dimensional continuos reinforcements for metal matrix composites consisting of interpenetrating, continuous metal and ceramic phases, taking full advantage of the desirable properties of each phase while eliminating the inherent drawbacks of each phase, such as low temperature brittleness in ceramics and high temperature creep and wear in metals. The proposed investigation covers the modeling, fabrication, characterization, and testing of ceramic foam-reinforced aluminum-based metal matrices and provides the groundwork for further investigation and development. The effect of material compositions, reinforcement structure and volume fraction, and processing (melt infiltration) conditions on the microstructure and flexure, tensile, and processing (melt infiltration) conditions on the microstructure and flexure, tensile, and impact properties of these unique composites will be investigated. Limited design information, such as physical properties, mechanical properties (strength and modulus), and thermal fatigue and thermal shock resistance, will be generated as well.