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12 Cards in this Set
- Front
- Back
Weld defects |
Undercutting Penetration |
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Interdiffusion |
Where atoms of one type diffuse throughout the lettuce of the different atoms |
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Self diffusion |
Where both the atoms moving and the atom in the lattice are the same type |
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Types of diffusion |
Inter diffusion self diffusion |
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Mechanisms of diffusion |
Vacancy diffusion and interstitial diffusion |
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Intersitial diffusion |
Interstitial and purity items move adjacent to intersitial sites |
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Ficks first law |
Applies where J is constant which is flux |
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What does D stand for and ficks first law |
An indication of how easily the items of interest to move through the lattice |
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Mechanisms of creep |
Dislocation Crete and a fusion of cream |
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Dislocation |
Causes plastic deformation from dislocation movement |
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Designing against dislocation creep |
Use materials with high melting point Maximise dislocation obstruction(alloying to form solid solutions and precipitates) If possible choose material with a large lattice resistance e.g. covalent bonding |
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Against diffusion creep |
Materials hi Melting point A large grain size (means greater diffusion distance and less green boundaries) Have precipitate a great boundaries (impedes grinder sliding) |
