The fracture behavior of Al-8. 5Fe-1. 3V-1. 7Si (mass fraction,%) alloy under different deforming conditions was investigated. The results show that the propagation mode of the main crack was correlated with the orientation of prior powder boundaries (PPB’s) when the specimen ruptured. For the L-direction tensile specimen, the LT-oriented microcrack along PPB’s didn’t affect the main crack’s extension; the LS-oriented microcrack might lead to unusual failure; the TS-oriented boundary was ready to become the low-energy propagating path for the main crack. Hot rolling resulted in a larger increase of the cohesion strength of LS-and TS-oriented boundaries than that of LT-oriented boundary, thus causing the corresponding change of fracture mode at a certain deformation amount (30%). The different variation tendency for fracture strength and elongation arised from this change of fracture mode and subsequent work hardening.