Problem 2 If 1250°C and 40 wt% Ni, then: a) which phases are present? b) the phase compositions c) the weight fraction of each phase. T(° C) 1300-L (liquid) Cu-Ni system liquidus L+ a 1200 L+ a solidus a (solid) 20 30 40 50 wt% Ni Problem 3 For a 60 wt% Sn-40 wt% Pb alloy at 150°C, determine: a) the phases present b) the phase compositions c) the relative amount of each phase T° C) 300+ L (liquid) L+a 200+ α 183 C L+B B 18.3 61.9 97.8 100 0 20 a+ß 60 80 100 C, wt% Sn