Compare the diffusion coefficients of carbon in BCC and FCC iron at the allotropic transformation temperature of 912C and explain the difference.
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Compare the diffusion coefficients of carbon in BCC and FCC iron at the allotropic transformation temperature of 912C and explain the difference.
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- 2. (a) Prove that the ideal c/a ratio for the hexagonal close-packed structure is √8/3=1.633. (b) Sodium transforms from bcc to hcp at about 23K (the "martensitic" transformation). Assuming that the density remains fixed through this transition, find the lattice constant a of the hexagonal phase, given that a=4.23Å in the cubic phase and that c/a ratio is ideal in the hcp phase.Using 0.901 g/cm3 for density of tri - isopropylsilanol (i-C3H7)3SiOH and assuming spherical shape of the molecule, determine its molecular cross section and the maximal grafting density for these molecules supported on a flat silica surface.a) Calculate the basicity and acidity of a slag composed of 41 wt% SiO2; 13 wt% FeO; 39 wt% CaO, 7 wt% MgO. (Molecular Weights; Ca: 40.08, O: 16.0, Fe: 55.85, Si: 28.08, Mg: 24.31) b) Describe the formation stage of white matte during the pyrometallurgical production of copper. Calculate the theoretical amount of Cu in the white matte. (Molecular Weights; O: 16, Fe: 55.85, Si: 28.08, Cu: 63.5, S: 32.06).
- X-ray diffractionanalysis(using a Cu anode)of a specimen with a known cubiccrystal structure reveals that the peak generated as a result of reflection from the (110) plane occurs at a 2θ=32°. Determine the unit cell volume of this materia(b) Answer both: i. Define Refractory material and give its one application. ii. Define porosity of refractory and its effect on strength.2. (d) Describe three of the functions of the matrix in fibrereinforced composites. (e) With the aid of sketches compare and contrast the fatigue fracture appearance between an alloy that failed at a low fatigue load and one that failed at a high fatigue load. (f) Propose and briefly describe one non-destructive method that can be used to detect small cracks on the surface of a metallic alloy .
- Compute diffusion coefficients for the interdiffusion of carbon in both (a) a-iron (BCC) and (b) y-iron (FCC) at 975°C. Assume that Do for the interdiffusion of carbon in a-iron and in y-iron are 1.1 x 106 and 2.3 x 105 m²/s, respectively, and that Quare 80 and 148 kJ/mol, respectively. (a) (b) m²/s m²/s. An internal friction peak caused by interstitial diffusion in a bcc metal has its peak at 50° C at a frequency of 0.70 Hz. When the frequency is changed to 2.81 Hz the peak is shifted to 64° C. (a) Calculate Q for the process. (b) If the lattice parameter is 3.2 x 10 cm, calculate D at 100° C and D..Fill in the blanks with the following choices: occlusion, mechanical entrapment, surface absorption, mixed crystal formation