{HEAD ~ Such alloys} tend to have {TAIL ~ grains} of excessive size which can lead to brittle castings 
{ HEAD ~ Such alloys } tend to have { TAIL ~ grains } of excessive size which can lead to brittle castings
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH