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