More specifically, Nb, {HEAD ~ Ti}, Co and Cu, Fe or Mn are mixed in {TAIL ~ proper proportions} to prepare the alloy 
are mixed in
More specifically , Nb , { HEAD ~ Ti } , Co and Cu , Fe or Mn are mixed in { TAIL ~ proper proportions } to prepare the alloy
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH