Simulating the consolidation processing of MMC's and implications for product viability

摘要

Nodels which describe the evolution of microstructural features, such as porosity, fiber microbending and interfacial reaction zone thickness, during elevated temperature consolidation processing (e.g. HIP, VHP) of continuous fiber-reinforced metal matrix composites (MMC's) are reviewed. Model predictions are presented showing how attempts to produce high quality material, i.e. create fully dense materials while minimizing fiber and coating damage, place conflicting demands on process schedules, leading to the existence of optimal solutions. The models show that not only is the processing history important, but selecting a compatible (both chemically and mechanically) fiber/matrix system is critical for success. The relative processibility of several titanium alloy/fiber systems of current interest for aerospace applications is discussed. A summary of factors affecting material quality and cost during consolidation processing, and hence product viability, is presented.