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