Point Defects (Leaving Cert Engineering): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What are the organised arrangements of atoms in metals called?
What are the organised arrangements of atoms in metals called?
Crystal lattice structures
What scale of defects do point defects represent in crystalline materials?
What scale of defects do point defects represent in crystalline materials?
The smallest scale possible
Why are point defects considered zero-dimensional?
Why are point defects considered zero-dimensional?
They occur at specific atomic positions
How does the surrounding material respond when vacancy defects form?
How does the surrounding material respond when vacancy defects form?
Distorts inward
When do vacancy defects commonly occur in metal forming?
When do vacancy defects commonly occur in metal forming?
During cooling after forming
What stress do larger foreign atoms create in substitution defects?
What stress do larger foreign atoms create in substitution defects?
Compressive stress
What effect do smaller foreign atoms have in substitution defects?
What effect do smaller foreign atoms have in substitution defects?
Generate tensile stress
Where do foreign atoms occupy in interstitial defects?
Where do foreign atoms occupy in interstitial defects?
Spaces between normal atomic positions
How do interstitial defects affect material ductility?
How do interstitial defects affect material ductility?
Reduce ductility, making material brittle
What happens when defect concentrations are too high?
What happens when defect concentrations are too high?
Unpredictable mechanical properties