An article 6 wherein {TAIL ~ the iron composition} comprises {HEAD ~ greater than about 2.5 wt % aluminum} 
An article 6 wherein { TAIL ~ the iron composition } comprises { HEAD ~ greater than about 2.5 wt % aluminum }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD