Using the Richardsen-Ellingham diagram, element (A)= Cu:0, Fe:1, Si:2, Ti:3, Mn:4, Ca:5, Al:6, Ni:7, Mg:8, Co:9 For Ti

5. (25) Using the Richardsen-Ellingham diagram, element (A)= Cu:0, Fe:1, Si:2, Ti:3, Mn:4, Ca:5, Al:6, Ni:7, Mg:8, Co:9 Like Cevat:Cu, Bahadir: Cu a) Find the equilibrium partial pressure of oxygen in equilibrium in reactions (i) and (ii) at below melting point of element A Example:TiO2, u=1, n=2 (i) (2u)A(s)+O2(g)=(2)AuOn(s) (ii) 4/3Cr(s)+O2(g)=2/3Cr2O3(s) b) Do A and Cr oxidize at 500C or below melting point of element A in air? Prove. c) Let assume that A and Cr are mixed to form a ACr alloy. Solid solution of A and A contains XCr=0.1 and solute atoms obeys Henrys'law. Henry's constant is 4. Assume the composition of alloy does not change during oxidation (experimental compostion is the the same as equilibrium composition). Calculate the equilibrium partial pressure of oxygen in equilibrium at 500C : i) (2u)A(s)(in sol )+O2(g)=(2)AuOn(s) ii) 4/3Al(s) (in NiCu solution) +O2(g)=2/3Al2O3(s) d) Compare the equilibrium partial pressure of oxygen in (a) and (c) e) Please explain the evolution of reactions when A and Cr elements were held in furnace in air at 500C ? What do you expect at the end of reactions? 5. (25) Using the Richardsen-Ellingham diagram, element (A)= Cu:0, Fe:1, Si:2, Ti:3, Mn:4, Ca:5, Al:6, Ni:7, Mg:8, Co:9 Like Cevat:Cu, Bahadir: Cu a) Find the equilibrium partial pressure of oxygen in equilibrium in reactions (i) and (ii) at below melting point of element A Example:TiO2, u=1, n=2 (i) (2u)A(s)+O2(g)=(2)AuOn(s) (ii) 4/3Cr(s)+O2(g)=2/3Cr2O3(s) b) Do A and Cr oxidize at 500C or below melting point of element A in air? Prove. c) Let assume that A and Cr are mixed to form a ACr alloy. Solid solution of A and A contains XCr=0.1 and solute atoms obeys Henrys'law. Henry's constant is 4. Assume the composition of alloy does not change during oxidation (experimental compostion is the the same as equilibrium composition). Calculate the equilibrium partial pressure of oxygen in equilibrium at 500C : i) (2u)A(s)(in sol )+O2(g)=(2)AuOn(s) ii) 4/3Al(s) (in NiCu solution) +O2(g)=2/3Al2O3(s) d) Compare the equilibrium partial pressure of oxygen in (a) and (c) e) Please explain the evolution of reactions when A and Cr elements were held in furnace in air at 500C ? What do you expect at the end of reactions