(Al-Mg-O). This same behavior is not observed in the 319-Saffil composites where magnesium is not present. The UTS and the failure strain continue to increase with solution time up to ten hours.


A319 Composites The composites manufactured with the modified A319 al-


1 hour 359-Saffil composite


loy exhibit a different behavior when solution treated. It is worth noting again that the there is no magnesium present in this alloy. The strength of these composites do not all rise with longer solution times. The Saffil composite continues to increase in strength up to ten hours. There are increased bonding areas evident on the fiber surfaces of the six and ten hours tests (Fig 5). The failure strain (or ductility) increased correspondingly in these composites.


SEM Images of A359 – Composites 3 hours 359-Saffil composite


6 hours 359-Saffil composite


Clean, smooth fibers 1 hour 359-Hybrid composite


Good overall bonding 3 hours 359- Hybrid composite


Shale/bark like appearance 6 hours 359- Hybrid composite


Some bonding to fibers/particles 1 hour 359-30%SiC composite


Reaction products evident 3 hours 359-30%SiC composite


Good bonding to fibers/particles 6 hours 359-30%SiC composite


Bark-like layers/not effective bond International Journal of Metalcasting/Winter 11


Some bonding to particles


Some bonding to particles Figure 3. SEM micrographs of solution treatment effects on A359 composites. 61


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