The mechanical and physical properties of aluminum-matrix composites r
einforced with high-performance continuous alumina fibers are reviewed
and compared with those of other structural materials. Continuous-fib
er reinforced aluminum-matrix composites offer outstanding improvement
s in specific strength and specific stiffness over conventional alloys
and particulate composites. The longitudinal tensile strength of an a
luminum matrix reinforced with 55-65 vol.% alumina fibers is in the ra
nge of 1.4-1.9 GPa, the longitudinal Young's modulus is 220-240 GPa, a
nd the density is 3.2-3.4 g/cm(3). The mechanisms of strengthening and
fracture under longitudinal, transverse, and shear loading are review
ed. Examples of applications are presented that are representative of
the range of product forms being developed.