Paper number 1029

MECHANICAL STRENGTH MODELING OF HIGH TEMPERATURE SIC DISCONTINUOUSLY REINFORCED HEAT TREATED ALUMINUM ALLOYS

James M. Fragomeni¹

1Department of Mechanical Engineering, Ohio University, College of Engineering and Technology, 251 Stocker Engineering Center, Athens, Ohio, 45701, USA

Summary

The purpose of this paper is to present some work that has been done in regards to understanding the strengthening behavior of dispersion strengthened high temperature aluminum alloys discontinuously reinforced with silicon carbide. The theoretical modeling is presented for the strengthening based primarily on large particle sizes where the dislocations bypass and loop the dispersoids based on the Orowan mechanism. The effects of smaller dispersoids sizes where the dislocation shearing would contribute to the strengthening was also considered. The combined effect of both dislocation dispersoid looping and dislocation dispersoid shearing was considered for a broad distribution of dispersoid sizes in the microstructure containing the silicon carbide reinforcement discontinuous distributed throughout the matrix phase.

Keywords

silicon carbide, orowan strengthening, dispersoids, dislocations, HTDRA, discontinuously-reinforced aluminum.