wherein the specific microstructural portion is present in a first plurality of particles which are provided with a casing where the specific microstructural portion is aluminum or aluminum and chromium and {HEAD ~ the casing} consists of a metal or {TAIL ~ a metal oxide}, 
consists of
wherein the specific microstructural portion is present in a first plurality of particles which are provided with a casing where the specific microstructural portion is aluminum or aluminum and chromium and { HEAD ~ the casing } consists of a metal or { TAIL ~ a metal oxide } ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH