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