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