NSF Young Investigator

小行星9458018 该计划探讨了在高温金属间合金和复合材料的微观结构设计中使用尖端材料科学和微观力学概念。 该研究涉及从材料结构，加工和失效机制的基础研究中获得的基础知识的应用，用于高温结构应用的无机材料的设计。 研究的系统包括：通过快速凝固和铸锭冶金技术生产的原位钛基复合材料;通过铸锭和粉末冶金技术生产的双韧γ-基铝化钛金属间化合物;以及通过干相混合和喷射成形技术生产的协同增韧铝化镍复合材料。 加工后，非常详细的研究复合材料的结构和失效机制进行了不同的微观结构尺寸尺度的复合材料。 通过系统的实验和细观力学分析，研究了裂纹尖端屏蔽机制对复合材料力学性能的影响。 从这些研究中获得的知识将用于指导具有不同微观结构尺寸尺度的损伤容限复合材料设计的实用概念的发展。 ***

9458018 Soboyejo The program explores the use of cutting edge materials science and micromechanics concepts in the microstructural design of high temperature intermetallic alloys and composites. The research involves the application of fundamental knowledge derived from basic studies of materials structure, processing, and failure mechanisms, in the design of inorganic materials for high temperature structural applications. The systems studied include; in-situ titanium-matrix composites produced by rapid solidification and ingot metallurgy techniques; twin-toughened gamma-based titanium aluminide intermetallics produced by ingot and powder metallurgy techniques; and synergistically toughened nickel aluminide composites produced by dry phase blending and spray forming techniques. After processing, very detailed studies of composite structure and failure mechanisms are carried out on composites with different microstructural size scales. Systematic experiments and micromechanics analyses are performed to investigate the effects of crack-tip shielding mechanisms on composite mechanical properties. %%% The knowledge derived from these studies will be used to guide the development of practical concepts for the design of damage tolerant composites with different microstructural size scales. ***