GATE Mechanical Behaviour of Materials: Dislocations and strengthening – Previous Year Questions
17 GATE previous year questions on Dislocations and strengthening (Mechanical Behaviour of Materials, Metallurgical Engineering) with answers and explanations, from every paper.
- GATE 2021 MT Q56 – Two dislocation lines parallel to z lie in the x–z plane as shown. The glide force exerted by the edge dislocation on the screw dislocation is N…
- GATE 2021 MT Q57 – A shear stress 100 MPa bows a dislocation between precipitates spaced 0.2 μm. If spacing increases to 0.5 μm, the needed shear stress is MPa (nearest…
- GATE 2022 MT Q33 – Let ,,v denote strain rate, dislocation density, and dislocation velocity. If Orowan’s equation for dislocation plastic flow holds, which…
- GATE 2022 MT Q40 – Match the dislocation reactions P–R to descriptions 1–3. Here a 0 is the lattice parameter. P. (a 0/2)[11 1]+(a 0/2)[111]=a 0[001] Q. (a 0/6)[121]+(a…
- GATE 2022 MT Q41 – Match phenomena with descriptions. Column I: P. Cottrell atmosphere Q. Suzuki interaction R. Bauschinger effect S. Nabarro–Herring creep Column II: 1.…
- GATE 2023 MT Q21 – Two dislocations with Burgers vectors (a/2)[101] and (a/2)[011] react. The magnitude of the resultant Burgers vector is
- GATE 2023 MT Q51 – A dislocation loop PQRSTU lies on the (111) plane of a cubic single crystal, with Burgers vector (1/6)[1 21]. Segments PU and PQ are parallel to [01…
- GATE 2024 MT Q24 – The figure shows a circular dislocation loop with fixed Burgers vector b (horizontal arrow). The dash-dot lines are horizontal and vertical diameters,…
- GATE 2024 MT Q25 – Match the concepts in Column I with phenomena in Column II. Column I: P. Peierls–Nabarro stress Q. Cottrell’s atmosphere R. Paris law S. Considère’s…
- GATE 2024 MT Q34 – A single crystal has slip-plane normal at 60 and slip direction at 45 to the tensile axis. Its critical resolved shear stress is 2 MPa. The tensile…
- GATE 2025 MT Q21 – Two randomly oriented polycrystalline copper samples with average grain sizes of 10 μm (Sample A) and 100 μm (Sample B) were tested at room…
- GATE 2025 MT Q26 – With reference to edge and screw dislocations, which of the following statements is/are CORRECT?
- GATE 2025 MT Q61 – A single-crystal BCC metal with lattice parameter a=0.4 nm deforms at shear strain rate 0.001\ s-1. Its average mobile dislocation density is 1010\…
- GATE 2026 MT Q16 – Which one of the following options is correct? In a face-centered cubic metal, Shockley partial is:
- GATE 2026 MT Q18 – Which of the following dislocation dissociation reactions is feasible in face-centered cubic metals?
- GATE 2026 MT Q37 – Match the concepts in Column I with the associated terms in Column II. Column I: (P) Paris law (Q) Schmid factor (R) Larson–Miller parameter (S)…
- GATE 2026 MT Q52 – The lattice parameter of face-centered cubic Ni is 0.35 nm and its shear modulus is 76 GPa. The strain energy per unit length of a screw dislocation…