Question

o adjacent and parallel planes of atoms(Gie. The magnitude of the distance between two adjacent and parn lanar spacing dhkl, is a function of the Miller indices and the interp crystal whose lattice parameter is a (unit cell edge length), the relation araters e relation is as follows: ( For BCC iron compute the interplanar spacing for the (220) set of planes (i) Compute the diffraction angle for the (220) set of planes using Brag's low Given for BCC iron: lattice parameter 0.283 nm. Assume x-ray wavelength of 0.1790mm for Bragg law. 4h. A polycrystalline material is an assembly of many small single crystals that are oriented in different directions. The yield strength, Oy, of polycrystalline materials is given by so-called Hall-Petch relation: ơy σ0 + kyd-1/2, where 'd'is the average grain size; σο and ky are the constants for a particular alloy. G) For a bronze alloy, if the yield strength is 75 MPa, grain size is 0.1 mm,and o is 25 MPa, calculate the constant, ky, for this bronze alloy? (i) At what grain size (in mm), the strength of this alloy will become 200

Answer 1