The metallic substrate and or layer may be made from {HEAD ~ an alloy} such as a Cobalt or {TAIL ~ a Nickel based superalloy} 
such as
The metallic substrate and or layer may be made from { HEAD ~ an alloy } such as a Cobalt or { TAIL ~ a Nickel based superalloy }
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 TAIL