Interfacical reaction between aluminum borate whisker and AC8A and 6061 aluminum alloys.

Abstract

The microstructure of the aluminum borate whisker reinforced AC8A matrix composite fabricated by squeeze casting was examined with high resolution electron microscopy. Fine reaction products were observed on the whisker surface, which were identified to be MgAl2O4 (partly -Al2O3). Those reaction products introduced large strain inside to accomodate the lattice mismatch with a whisker and showed the crystallographic orientation relationship as follows: