Bonding, Crystallography, and Crystal Defects
Bonding, Crystallography, and Crystal Defects MSE 305
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This 2 page Class Notes was uploaded by Keshaun Ferry on Saturday October 3, 2015. The Class Notes belongs to MSE 305 at Boise State University taught by Staff in Fall. Since its upload, it has received 11 views. For similar materials see /class/217987/mse-305-boise-state-university in Material Science and Engineering at Boise State University.
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Date Created: 10/03/15
31211 Ninjamadly MSE 305 Bonding Crystallography and Crystal Defects Weekly Learning Objectives Week 1 Lattices 1 Identify translational symmetry operations De ne primitive or multiple unit cells Understand the ve types of plane lattices Identify crystallographic directions Name crystallographic planes khth Week 2 2D Symmetry 1 List or derive the 10 2D point symmetries Know and use the common nomenclature for symmetry operations Explain why only certain rotation axes are allowed crystallographically Determine the 2D plane group of any pattern Locate ALL symmetry elements of a pattern using the plane group as a guide 03sz Week 3 3D Relationships and stereographic projections 1 Determine the indices of directions or planes in 3D lattices Find the zone axis for any pair of planes Explain the geometry of the stereographic projection Draw the plane normals for any object on a stereographic projection Use a stereographic projection to show the relationship between symmetry operators ung Week 4 3D Symmetry 1 Determine the geometry of three rotation axes that meet at a point Identify the 3D point symmetry of any object or point in a pattern 3 Derive the compound symmetry operations rotoinversion and rotore ection 4 Derive a 3D point group given an axial combination and an extender 5 De ne the six crystal systems Week 5 Crystal structures 1 Understand the conventions used in the International Tables of Crystallography Use the process of elimination to narrow down the space group of structure 3 Identify the Bravais lattice basis and space group of common crystal structures 4 Locate rotation re ection and glide symmetries in crystal structure models 5 Calculate volumetric and planar atom densities of common crystal structures Week 6 Symmetry Review Tensors 1 De ne the following terms and give examples where relevant basis symmetry operator point group extender lattice crystal system unit cell space group 2 Apply the procedures outline in lecture to determine the point group or space group for any object or pattern 3 Identify planes in the hexagonal crystal system using the MillerBravais notation see handouts 4 Describe the relationship between the symmetry of a crystal and its properties 5 Transform one coordinate system to another using direction cosines Slat Willabrad Week 7 Symmetry and Properties Tensors l Equot 5 5 U Use the Einstein notation in expressions involving tensor properties Calculate the response of a material to an applied eld when the two are related by a tensor property ie nd current density given the applied eld and conductivity tensor Use a tensor transformation to determine the magnitude of a property in a speci c direction Determine the shape of the representation quadric for any tensor property and explain its signi cance Use the method of direct inspection to determine the unique nonzero components of a tensor for any point group Weeks 89 Bonding ND I kIIJBW De ne the four major types of bonds and their main characteristics Identify the crystal structures most common for materials with a given bond type Predict the coordination number in ionic compounds based on the radius ratio Relate the bond energy to material properties Explain how the elastic response of a material is dependent on the type of bonding Week 10 Point defects and diffusion maspr Describe the different kinds point defects Show how the symmetry of a crystal changes when points defects are present Calculate the change in energy of the crystal associated with the presence of defects Explain the motion through the lattice of point defects Use KrogerVink notation to describe defect reactions in ionic crystals Week 11 Dislocations l khwa Determine the character of a dislocation based on its line and Burger s vectors De ne the slip plane and slip directions in SC BCC FCC and HCP crystals Explain the difference between sessile and glissile dislocations Explain the two types of dislocation motion Determine how dislocations will move in a given environment Week 12 More dislocations ND I kIIJBW Calculate the energy and stress eld associated with a dislocation Predict the interaction between two dislocations based on their forces Describe the geometry of partial dislocations in FCC crystals Calculate equilibrium spacing for partial dislocations based on the stacking fault energy Use a Wulff plot to determine the minimum energy surfaces of a crystal Week 13 Grain boundaries and texture l khth Use a yplot to determine the equilibrium shape of a crystal and explain why different surfaces have different energies Describe the different structures of tilt and twist boundaries Calculate the dislocation spacing of a lowangle grain boundary Illustrate the structure of a lowangle boundary Explain the structure of coincidence site lattice boundaries and why they have low energy
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