Define the term redox reaction.

1. A 65 wt% Ni -35 wt% Cu alloy is heated to a temperature within the a + liquid phase region. If the composition of the a phase is 70 wt % Ni, determine i. The temperature of the alloy ii. The composition of the liquid phase iii. The mass fraction of both phases Composition (at% Ni) 20 40 60 80 100 1600 H 2800 1500 Liquid 1453°C 2600 1400 Solidus line Liquidus line 2400 1300 a +L 1200 2200 1100 A 2000 1085°C 1000 20 40 60 80 100 (Cu) Composition (wt% Ni) (Ni) Temperature (°C) Temperature (F)

34 If the following diagram represents the sintering of the ceramic MgO, what could the curves x and y refer to? increase in property X 1000 1200 1600 sintering temperature (°C) (A) = grain size; y porosity (B) x grain size; y = strength O(C) x porosity; y-grain size 1400 O (D) x strength; y grain size 1800

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