Question

Which of the following statements are correct?
1. In a ductile material elastic deformation is more predominant than plastic one.
2, Brittleness is not an absolute property of a metal.
3. Rate of loading has no influence in changing the behaviour of a metal from 'ductile' to 'brittle' at low temperatures.
4. Under hydrostatic compression, a brittle metal may change into a ductile one.

• A. 1 and 2
• B. 2 and 3
• C. 3 annd 4
• D. 2 and 4

Answer 1

The correct option is D 2 and 4

Rate of loading also determines nature of metal. Ductile material can have substantial plastic deformation also.
Work by Bridgman showed that normally brittle materials can be made to behave in ductile manner if they are loaded under extremely high pressure. Practical use of this phenomenon is made in the commercial processing of extremely difficult to form metals and shapes.