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material science Questions: In the given crystal structure ? (1) Write the postions for the four...
Material science
2. Barium (Ba) has a BCC crystal structure, a measured density of 3.51 g/cm3, and a lattice parameter of 0.502 nm. If the atomic mass of Ba is 137.33 g/mol calculate (a) the fraction of attice points that contain vacancies, and (b) the total number of vacancies in a cubic meter of Ba.
The crystal structure of XY is given here. Answer the following questions according to the crystal structure given. = y2- X+ What is the coordination number of X+? What is the coordination number of Y2-? How many formula units are in the unit cell shown for X,Y ? 1||2|3|4|5|6||7|8
(1) A crystalline grain of iron (BCC crystal structure) in a metal plate is situated so that a tensile stress is applied along the [110] crystal direction of the grain, if slip occurs on a (101) plane and a [111] direction, determine the amount of tensile stress that is required to produce a critical resolved shear stress of 31.1MPa in the grain? [15 points] (2) Draw the unit cell structure, and on your sketch indicate: (i) the tensile direction, (ii)...
8- The microstructure and crystal structure of a material a) affect the macroscopic properties. b) cannot be changed by processing. c) refer just to the crystal size in a material, d) refer to the strength of a material. e) none of the above.
A single crystal of Al has the FCC crystal structure and is oriented such that a tensile stress is applied parallel to the [010] direction. If the critical resolved shear stress for this material is 0.2 MPa, calculate the magnitude(s) of applied stress(es) necessary to cause slip to occur on the (111) plane in each of the [1̅10] [1̅01] [011̅] Also, which of these slip systems is “preferred” for slip?
Simple Cubic (SC) Structure 1. Write the Miller indices for the family of close-packed directions in the SC crystal. <hkl>= 2. Write the expression for theoretical density of a material with SC structure in terms of atomic radius (R), atomic weight (A), and Avogadro's number (NA). (Show your work.) 3. Calculate the planar density for the most densely packed SC planes in terms of atomic radius (R). (Show your work.) PD Body-Centered Cubic (BCC) Structure 4. How many non-parallel close-packed...
Magnesium has the HCP crystal structure. Given the data from the previous problem and the fact that we can take the lattice constant in the c-direction to be 0.497, what is the planar packing factor for the (10 -1 0) (... forgive the formating as I cannot do an overbar here) plane?
S.1 Write four structure isomers open for each of the molecules whose closed formulas are given below and name each structure isomer according to the IUPAC system. a) C6H14 b) C6H12 c) C6H10 d) C6H
1. A single crystal sample of a metal with a HCP structure is subjected to an axial tensile force. The sample is of circular cross-section, with a diameter of 4 mm, and is of 50 mm length. An elastic extension of 0.047 mm is measured when an axial tensile force of 1.25 kN is applied. When the tensile force is increased to 2.8 kN plastic deformation commences. (a) Given that Poisson’s ratio for the metal is 0.35, estimate the theoretical...
Question 5 1) In the crystal structure of CuF, the Cu2+ ion is six coordinate with four F ions at a distance of 1.93 A and two F ions at a distance of 2.27A. Explain. 2) Which of the following ligands F, CN, H20 and NO2 will form significantlhy distorted octahedral complexes with cobalt (II)? Explain 3) Which of the following octahedral complexes are expected to show very weak tetragonal distortion and why? (a) [Cr(CDl (b) [Mn(H20) (c)Cr(Ho and [Ti(H20...