GATE MT 2020 Q17. For a material to exhibit super plasticity, one of the requirements is:
GATE MT 2020 Q17. For a material to exhibit super plasticity, one of the requirements is:
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Superplasticity is state in which a solid crystalline material is deformed well more than its usually breaking point , this can be about 200% during tensile deformation. So how we get these. First requirements: Very fine grains (smaller grain size) Usually round shaped equiaxed grains. High temperatRead more
Superplasticity is state in which a solid crystalline material is deformed well more than its usually breaking point , this can be about 200% during tensile deformation.
So how we get these.
First requirements:
Possible mechanism:
One can relate this mechanism with the requirements to see how this actually happens.
This materials can uniformly elongate to larger extent without necking i e. Ultimate fracture and so has crucial applications.
See lessHigh strain rate sensitive
High strain rate sensitive
See lessCorrect answer is option C. @Rohit.km described it best. Thank you. Some peripheral lines related to this topic: Examples of superplastic materials are some fine-grained metals and ceramics. Titanium and titanium based alloys are examples of superplastic materials. In metals and ceramics, requiremRead more
Correct answer is option C. Rohit jha.km described it best. Thank you.
Some peripheral lines related to this topic:
- Examples of superplastic materials are some fine-grained metals and ceramics.
- Titanium and titanium based alloys are examples of superplastic materials.
- In metals and ceramics, requirements for it being superplastic include a fine grain size (less than approximately 20 micrometres) and a fine dispersion of thermally stable particles, which act to pin the grain boundaries and maintain the fine grain structure at the high temperatures and existence of two phases required for superplastic deformation.
- Those materials that meet these parameters must still have a strain rate sensitivity (a measurement of the way the stress on a material reacts to changes in strain rate) of >0.3 to be considered superplastic.
See lessThe material may not get strain hardened due to absence of dislications, no pile up, further continuous flow lead to super plasticity eg thin foils of Au and Ag for direct consumption with sweets.
The material may not get strain hardened due to absence of dislications, no pile up, further continuous flow lead to super plasticity eg thin foils of Au and Ag for direct consumption with sweets.
See less