The leadtin phase diagram is shown below Fig 98 p300 Using t

The lead-tin phase diagram is shown below. (Fig. 9.8, p.300). Using this diagram determine which of the following phases/phase combinations will be present for an alloy of composition 79 wt% Sn - 21 wt% Pb that is at equilibrium at 230°C.

Composition At%Sn 100 20 G0 327 600 300 Liquid +L 400 3 183 61.9 978 18.3 300 100 100 Sn Pb Composition Wi%Sn O alpha O liquid O alpha liquid O beta liquid O alpha +beta O alpha beta liquid

Solution

beta+liquid