Lead demonstrates behavior where it_________________?
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Answer: D. Cannot be work hardened
Explanation
Lead is an exceptionally soft metal with a low recrystallization temperature below room temperature. Any mechanical deformation at room temperature immediately triggers spontaneous recovery and recrystallization. Consequently internal stresses cannot accumulate to produce the dislocation networks needed for work hardening. Work hardening occurs when metals are deformed below their recrystallization temperature creating dislocation entanglements. Lead melts at a relatively low temperature of three hundred twenty seven degrees Celsius. At ambient temperatures lead is technically operating above its homologous recrystallization threshold.
This unique behavior means lead objects cannot be strengthened through cold rolling or hammering. Fabricators must account for this softness when designing structural supports made of lead. Lead sheets will slowly deform under their own weight due to this lack of strain hardening. Lead is one of the softest common metals rather than the hardest material available. Lead is among the heaviest common engineering metals due to its high atomic mass. Lead can easily be scratched and marked using a standard human fingernail.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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