There is then a further heating and cooling step in {HEAD ~ a reducing atmosphere} wherein {TAIL ~ the oxidised metallic component} is reduced to a metal 
There is then a further heating and cooling step in { HEAD ~ a reducing atmosphere } wherein { TAIL ~ the oxidised metallic component } is reduced to a metal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH