In one embodiment according to the invention, {HEAD ~ the metal matrix composite} has {TAIL ~ the following composition} : 
has
In one embodiment according to the invention , { HEAD ~ the metal matrix composite } has { TAIL ~ the following composition } :
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH