Question:
Intergranular fracture occurs mostly ________
Intergranular fracture occurs mostly ________
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Above ECT: Boundaries are weak $\rightarrow$ Intergranular. Below ECT: Grains are weak $\rightarrow$ Transgranular.
Updated On: Jul 4, 2026
- Below Equi-cohesive temperature
- Above Equi-cohesive temperature
- At Equi-cohesive temperature
- At absolute Temperature
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The Correct Option is B
Solution and Explanation
Step 1: Concept The Equi-cohesive Temperature (ECT) is the temperature at which the strength of the grains equals the strength of the grain boundaries.
Step 2: Meaning Below the ECT, grain boundaries are stronger than the grains themselves, leading to transgranular (across the grain) fracture.
Step 3: Analysis Above the ECT, grain boundaries become weaker than the grain interior due to increased atomic mobility and creep effects.
Step 4: Conclusion As a result, fracture paths follow the weakened boundaries, resulting in intergranular fracture above the equi-cohesive temperature. Final Answer: (B)
Step 2: Meaning Below the ECT, grain boundaries are stronger than the grains themselves, leading to transgranular (across the grain) fracture.
Step 3: Analysis Above the ECT, grain boundaries become weaker than the grain interior due to increased atomic mobility and creep effects.
Step 4: Conclusion As a result, fracture paths follow the weakened boundaries, resulting in intergranular fracture above the equi-cohesive temperature. Final Answer: (B)
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