A3:Intermetallic Phases(Chapter 4) 9 points a)A requirement for a distinct solubility in binary alloys is for example,that both alloying partners must crystallize in the same crystall structure.Name additional requirements for a distinct solubility(Hume-Rothery-rules).(3 points) b) How is the long range order parameter defined (equation)?Give a relation and explain the different quantities appearing in it.Which range of values does this parameter show in case of an AB alloy?And for an AB3 alloy?Support your answer using calculations.(5 points) c) The occurrence of long range order phases can be confirmed by the appearance of so- called superlattice reflexes.Explain shortly,what is the meaning of superlattice reflexes and why do they appear.(2 points) A4:Diffusion (Chapter 5) 11 points a) Name the differences between vacancy diffusion and self diffusion.And explain what are their activation energies composed of.(2 points) b) Demonstrate that the diffusion coefficient for interstitial diffusion through octahedral sites in the fcc lattice can be determined by the relation: 6t (D-Diffusion coefficient,-Jump time,-Jump difference of the diffusing atom) Sketch all the necessary figures and explain all the involved quantities.(Derive the equation step by step)(11 points) A5 Dislocations a)Sketch a FCC unit cell with the proper atom positions with a standard cartisen co- ordinate system. b)You berve that n ede disocation with aBurgers vectorin thes plane splits into two Shockley-Partial dislocations: b,=52刘umdb,=8h1可A3: Intermetallic Phases (Chapter 4) 9 points a) A requirement for a distinct solubility in binary alloys is for example, that both alloying partners must crystallize in the same crystall structure. Name additional requirements for a distinct solubility (Hume-Rothery-rules). (3 points) b) How is the long range order parameter defined (equation)? Give a relation and explain the different quantities appearing in it. Which range of values does this parameter show in case of an AB alloy? And for an AB3 alloy? Support your answer using calculations. (5 points) c) The occurrence of long range order phases can be confirmed by the appearance of so￾called superlattice reflexes. Explain shortly, what is the meaning of superlattice reflexes and why do they appear. (2 points) A4: Diffusion (Chapter 5) 11 points a) Name the differences between vacancy diffusion and self diffusion. And explain what are their activation energies composed of. (2 points) b) Demonstrate that the diffusion coefficient for interstitial diffusion through octahedral sites in the fcc lattice can be determined by the relation:   6 2 D  (D – Diffusion coefficient,  – Jump time,  - Jump difference of the diffusing atom) Sketch all the necessary figures and explain all the involved quantities. (Derive the equation step by step) (11 points) A5 Dislocations a) Sketch a FCC unit cell with the proper atom positions with a standard cartisen co￾ordinate system. b) You observe that an edge dislocation with a Burgers vector   110 2 a b  in the slip plane splits into two Shockley-Partial dislocations:   121 6 a b1  und 211 6 a b2 