Term
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Definition
| material that has 3 dimensional arrangement to its atoms in the solid state |
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Term
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Definition
| material that does not have a 3 dimensional arrangement to its atoms in the solid state |
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Term
| 3 common crystal structures of Metals |
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Definition
1) Face Centered Cubic
2) Body Centered Cubic
3) Hexagonal Close Packed |
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Term
| Face Centered Cubic (FCC) |
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Definition
| tend to be soft and ductile (Al, Pb, Cu) |
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Term
| Body Centered Cubic (BCC) |
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Definition
| tend to be stronger and less ductile (Fe at room temp) |
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Term
| Hexagonal Close Packed (HCP) |
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Definition
| tend to be brittle (Zn, Mg) |
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Term
| Allotropic Phase Transformation |
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Definition
| metals that change crystal structure with temperature |
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Term
| 3 Stages of Solidification of Metals |
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Definition
1) Nucleation
2) Growth
3) Formation of Grain Boundries |
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Term
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Definition
atoms that are close together form a chemical bond
occurs at various locations in the metal |
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Term
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Definition
additional atoms bond to the nuclei formed in stage 1
growth occurs in 3 dimensions |
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Term
| Formation of Grain Boundaries (stage 3) |
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Definition
| where grains of different orientation meet |
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Term
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Definition
| area within a metal where the atoms have the same orientation |
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Term
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Definition
| area where grains of different orientation meet |
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Term
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Definition
| stronger and less ductile |
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Term
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Definition
| lower strength and higher ductility |
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Term
Rapid solidification causes...
Slow solidification causes... |
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Definition
... smaller grain size
... larger grain size |
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Term
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Definition
1) Vacancies
2) Dislocations |
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Term
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Definition
missing atoms at the same locations within a metals crystal structure
these control diffusion |
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Term
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Definition
missing 1/2 planes of atoms in a metals crystal structure
dislocation motion is what allows a metal to Plastically Deform |
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