Consider the magnesium oxide-aluminum oxide phase diagram; ss indicates a solid solution. The radii of Mg2 + and Al3 + are 0.072 and 0.053 nm, respectively. (a) There are two eutectic reactions on the diagram; describe them (temperatures, compositions and phases). (b) Spinel, at temperatures below 1000 °C, is a compound with a composition of 50 mol% Al2O3-50 mol% MgO. For higher temperatures, spinel is stable for a range of compositions. What is the temperature of the congruent fusion? (c) What are the main reasons for the low solubility of Al2O3 in MgO below 1400 °C?

pls immediately help me

An alloy consisting of completely soluble cadmium (Cd) and zinc (Zn) in the liquid state, but neither of them dissolves in each other in the solid state. the table shown below shows the solidification temperatures for various alloys of cadmium and zinc. 1. Draw the equilibrium diagram according to the information given and data in the table and indicating all important temperature and phases. 2. Find the percentage of each phases and percentage of constituents of the alloy that contain 60 % Zn and at a temperature 300 °C. 3. Find the melting point for the following alloys 20 % Cd, 80% Cd 4. Draw the internal structure, noting the phases of the following alloys A) 30 % Cd at 290 °C b) 60 % Cd at room temperature. % of Zinc in alloy Start of solidification ("C) End of solidification ("C) 0 10 14 20 30 40 50 60 321 290 266 275 293 310 328 345 70 80 90 100 362 390 401 419 266 266 266 266 266 266 266 266 266 266 266 266

Consider 2.0 kg of austenite containing 0.5 wt% C and cooled to just below 727°C (1341°F).      (a)  What is the proeutectoid phase?      (b)  How many kilograms each of pearlite, the proeutectoid phase, and cementite form?