Chapter 3_Part_2

Chapter 3_Part_2 - Metallic Crystal Structures Metals are...

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6 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Metallic Crystal Structures ¾ Metals are usually (poly)crystalline; although formation of amorphous metals is possible by rapid cooling ¾ As we learned in Chapter 2, the atomic bonding in metals is non-directional no restriction on numbers or positions of nearest-neighbor atoms large number of nearest neighbors and dense atomic packing ¾ Atomic (hard sphere) radius, R, defined by ion core radius - typically 0.1 - 0.2 nm ¾ The most common types of unit cells are • faced-centered cubic (FCC) • body-centered cubic (BCC) • hexagonal close-packed (HCP).
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7 MSE 2090: Introduction to Materials Science Chapter 3, Structure of solids Face-Centered Cubic (FCC) Crystal Structure (I) ¾ Atoms are located at each of the corners and on the centers of all the faces of cubic unit cell ¾ Cu, Al, Ag, Au have this crystal structure Two representations of the FCC unit cell
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8 MSE 2090: Introduction to Materials Science
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Chapter 3_Part_2 - Metallic Crystal Structures Metals are...

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