Question:
Brittle fractures occur in a trans granular manner. If the grain boundaries contain a film of brittle constituent, the fracture will occur
Brittle fractures occur in a trans granular manner. If the grain boundaries contain a film of brittle constituent, the fracture will occur
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Weak grain boundaries shift fracture mode from transgranular to intergranular.
Updated On: Jun 29, 2026
- In an intergranular manner along grain boundaries
- By ductile rupture through the grains
- With significant plastic deformation at grain boundaries
- By cleavage independent of grain boundary condition
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The Correct Option is A
Solution and Explanation
Concept:
Fracture mode depends on the weakest path for crack propagation. Grain boundaries are normally stronger, but if they contain brittle films, they become preferred crack paths.
Step 1: Normal brittle fracture.
In pure brittle materials, fracture is transgranular (through grains).
Step 2: Effect of brittle grain boundary film.
If grain boundaries contain brittle constituents:
• they become weak interfaces
• cracks propagate along boundaries Thus fracture becomes intergranular. Final Answer: \[ \boxed{\text{In an intergranular manner along grain boundaries}} \]
Step 1: Normal brittle fracture.
In pure brittle materials, fracture is transgranular (through grains).
Step 2: Effect of brittle grain boundary film.
If grain boundaries contain brittle constituents:
• they become weak interfaces
• cracks propagate along boundaries Thus fracture becomes intergranular. Final Answer: \[ \boxed{\text{In an intergranular manner along grain boundaries}} \]
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