Chapter 3_Part_5

Chapter 3_Part_5 - relevant to the texture orientation and...

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21 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Polycrystalline Materials Atomistic model of a nanocrystalline solid by Mo Li, JHU
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22 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Polycrystalline Materials Simulation of annealing of a polycrystalline grain structure from http://cmpweb.ameslab.gov/cmsn/microevolproj.html (link is dead)
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23 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Anisotropy Different directions in a crystal have different packing. For instance, atoms along the edge of FCC unit cell are more separated than along the face diagonal. This causes anisotropy in the properties of crystals, for instance, the deformation depends on the direction in which a stress is applied. In some polycrystalline materials, grain orientations are random, so bulk material properties are isotropic Some polycrystalline materials have grains with preferred orientations ( texture ), so properties are dominated by those
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Unformatted text preview: relevant to the texture orientation and the material exhibits anisotropic properties 24 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Non-Crystalline (Amorphous) Solids In amorphous solids, there is no long-range order. But amorphous does not mean random, in many cases there is some form of short-range order. Schematic picture of amorphous SiO 2 structure Amorphous structure from simulations by E. H. Brandt 25 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Summary Allotropy Amorphous Anisotropy Atomic packing factor (APF) Body-centered cubic (BCC) Coordination number Crystal structure Crystalline Face-centered cubic (FCC) Grain Grain boundary Hexagonal close-packed (HCP) Isotropic Lattice parameter Non-crystalline Polycrystalline Polymorphism Single crystal Unit cell Make sure you understand language and concepts:...
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 3_Part_5 - relevant to the texture orientation and...

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