6. Using the given sheet of the Ni-Cu phase diagram and For an alloy of 40 wt. % Ni - 60 wt. % Cu, write down the composition of the first solid formed. (2 Points) Enter your answer 7. Using the given sheet of the Ni-Cu phase diagram and For an alloy of 40 wt. % Ni - 60 wt. % Cu, write down the composition of the last liquid solidified. (2 Points) Enter your answer 8. Using the given sheet of the Ni-Cu phase diagram. Write down the number of phase fields in the phase diagram. (2 Points) Enter your answer Ni-Cu Phase diagram Composition (at% Ni) 0 1600 20 40 60 80 100 2800 1500 1453C 2600 1400 Solidus line 2400 Temperature (C) 1300 Temperature (F) 1200 2200 1100 2000 1085C 1 1000 0 20 40 60 80 100 (Ni) (Cu) Composition (wt% Ni)