Structural-Property Relationships in Composites Manufacturedby Transient Plastic Phase Processing

限制超耐火复合材料在高温结构应用中广泛应用的主要因素之一是用这些材料生产复杂形状部件的困难和相关的成本。此外，随着组分耐火度的增加，难度和费用都急剧增加。一种被称为瞬态塑性相加工（TPPP）的创新加工技术将用于原位净形制造复杂形状、全致密、超耐火复合材料，温度约为其熔化温度的0.65。该技术还具有产生新的、尚未开发的成分和微结构的潜力，这些成分和微结构很可能具有优越的机械、电气和磁性能。本文采用实验-模拟-计算相结合的方法，研究了这类新型软硬相混合材料的加工-显微组织/成分-性能关系，建立了显微组织与弹性模量、抗折抗压强度、断裂韧性、抗蠕变性能和高温延性等力学性能之间的关系。＊＊＊

9302216 Barsoum One of the major factors restricting the widespread use of ultra- refractory composites for high temperature structural applications has been the difficulty, and associated cost, of producing complex- shaped components from these materials. Furthermore, both the difficulty and the expense increase dramatically as the refractoriness of the constituents increases. An innovative processing technique termed as Transient Plastic Phase Processing (TPPP) will be used for in-situ net-shape manufacturing complex- shaped, fully dense, ultra-refractory composites at temperatures that are about 0.65 of their melting temperatures. The technique also has the potential of yielding new and as yet unexplored compositions and microstructures that may very well have superior mechanical, electrical and magnetic properties. The work is a combined experimental-modeling-computational research program to study the processing-microstructure/composition- properties relationships for this new class of the mixture of soft and hard phases, the relationships between microstructure and mechanical properties such as elastic moduli, flexural and compressive strength, fracture toughness, creep resistance and high temperature ductility will be established. ***