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