@biotelocalvino8 asked 4 months ago.

How do impurity atoms interfere with dislocation motion? use an illustration to help explain?

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@ofammello answered 4 months ago.

Imperfections in the crystal lattice are called impurities. Imperfections are usually atoms that are different from the rest of the atoms in the crystal lattice. The impurities cause the crystal lattice to distort.
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@ennapuppav answered 4 months ago.

Dislocations can move into the impurity atoms and get stuck there. This is known as an interface defect. As the atoms move past the impurity atoms, they will get stuck at the interface. If the impurity atoms are big enough, the dislocation will get stuck and not be able to move at all.
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@wezurrogo answered 4 months ago.

Impurity atoms can interfere with the motion of dislocations by either pinning dislocations or changing the Burgers vector. If the impurities have a higher lattice energy than the atoms in the crystal they can pin the dislocations against the impurities.
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@razommoqiddu answered 4 months ago.

Impurity atoms can interfere with dislocation motion in two ways: 1) by pinning dislocations to a particular crystal lattice point, or 2) by creating defects in the lattice which act as obstacles to dislocation motion. The illustration shows the process of dislocations pinning to a lattice point.

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