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