SME
Materials Science & Material Properties · Problem type
Crystal defects by dimension
Use this for “Is a grain boundary a point, line, interfacial or volume defect?”
Sort
How many dimensions does the defect extend in?
Tap a card, then tap its group.
Ask how far the disorder runs: one atom site, a line, a surface or a region.
Assumptions
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Defects are sorted by how many dimensions they extend in: 0, 1, 2 or 3.
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A dislocation is a line defect whether its slip is edge or screw.
Topic check
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Related lessons
Defects and diffusion
Main lesson
Diffusion coefficient at a temperature
Use this for “Carbon in iron has D₀ = 2.3 × 10⁻⁵ m²/s and Qd = 148 kJ/mol. Find D at 900 °C.”
Vacancies at a temperature
Use this for “Copper has 8 × 10²⁸ atom sites per m³ and Qᵥ = 0.9 eV. How many vacancies per m³ are there at 1000 °C?”
Steady diffusion flux (Fick’s first law)
Use this for “Carbon diffuses through a 5 mm iron plate from 1.2 to 0.8 kg/m³ with D = 3 × 10⁻¹¹ m²/s. What is the flux?”