MTL 200 certification (Imperfections in Solids)
ASSESSMENT GUIDE
2025|MOST COMMON QUESTIONS WITH
CORRECTLY VERIFIED ANSWERS (the latest
ones)|ALREADY A+ GRADED|GUARANTEED
PASS/wishing you success in your studies
What is rule 1 of Hume-Rothery - Atomic size factor. Appreciable quantities of a solute
may beaccommodated inthis type of solid solution only when the difference in atomic
radiibetween thetwo atom types is less than about±15%. Otherwise, thesolute
atomscreatesubstantial lattice distortions and a new phaseforms.
What is rule 2 of Hume-Rothery - Crystal structure. For appreciable solid solubility, the
crystalstructures for metalsof both atom types must be the same.
What is rule 3 of Hume-Rothery - 3. Electronegativity factor. The more electropositive
one elementandthe more electronegative the other, the greater the likelihood that theywill
form an intermetallic compound instead of a substitutional solidsolution.
What is rule 4 of Hume-Rothery - Valences. Other factors being equal, a metal has more
of a tendencyto dissolveanother metal ofhigher valency than to dissolve one of alower valency.
What is rule 5 of Hume-Rothery - Maximum allowable interstitial impurity is less than
10%.
Burger Vector Rules - - Burgers vector is the same at all points along its line!!!
Burgers vector is perpendicular to the Edge dislocations!!!!
- Burgersvector is parallel to the Screw dislocations!!!
- Burgers vector is neither parallel nor perpendicular to mix dislocations.
- Metallic Properties: magnitude of Burgers vector in a closed-packed direction is d_hkl
External Surfaces - surface area depends on the packing planar density.
ASSESSMENT GUIDE
2025|MOST COMMON QUESTIONS WITH
CORRECTLY VERIFIED ANSWERS (the latest
ones)|ALREADY A+ GRADED|GUARANTEED
PASS/wishing you success in your studies
What is rule 1 of Hume-Rothery - Atomic size factor. Appreciable quantities of a solute
may beaccommodated inthis type of solid solution only when the difference in atomic
radiibetween thetwo atom types is less than about±15%. Otherwise, thesolute
atomscreatesubstantial lattice distortions and a new phaseforms.
What is rule 2 of Hume-Rothery - Crystal structure. For appreciable solid solubility, the
crystalstructures for metalsof both atom types must be the same.
What is rule 3 of Hume-Rothery - 3. Electronegativity factor. The more electropositive
one elementandthe more electronegative the other, the greater the likelihood that theywill
form an intermetallic compound instead of a substitutional solidsolution.
What is rule 4 of Hume-Rothery - Valences. Other factors being equal, a metal has more
of a tendencyto dissolveanother metal ofhigher valency than to dissolve one of alower valency.
What is rule 5 of Hume-Rothery - Maximum allowable interstitial impurity is less than
10%.
Burger Vector Rules - - Burgers vector is the same at all points along its line!!!
Burgers vector is perpendicular to the Edge dislocations!!!!
- Burgersvector is parallel to the Screw dislocations!!!
- Burgers vector is neither parallel nor perpendicular to mix dislocations.
- Metallic Properties: magnitude of Burgers vector in a closed-packed direction is d_hkl
External Surfaces - surface area depends on the packing planar density.
