Issue 74

N. S. Dhongade et alii, Fracture and Structural integrity, 74 (2025) 1-19; DOI: 10.3221/IGF-ESIS.74.01

achieving the equilibrium state, leading to agglomeration or mushy zones as inferred in Fig. 10(b) for AA7075/5%TiB 2 /6%ZrO 2 hybrid composite system.

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(c) (d) Figure 9: SEM micrographs illustrating the microstructural morphology of AA7075 metal matrix composites reinforced with TiB 2 and ZrO ₂ : (A) Composite containing 5 wt.% TiB 2 and 4 wt.% ZrO ₂ , highlighting the homogeneous dispersion and interfacial bonding of ceramic particulates within the aluminum matrix; (B) Magnified view of the same composition emphasizing particle distribution and matrix–reinforcement interactions. C) Hybrid composite containing 5 wt.% TiB 2 and 6 wt.% ZrO 2 , highlighting particle agglomeration and distribution patterns; (D) High-magnification view of the same composition illustrating interfacial bonding and reinforcement morphology within the aluminum matrix.

(a) (b) Figure 10: Particle size distribution analysis of AA7075/TiB 2 /ZrO 2 hybrid composites: (A) Composite reinforced with 5 wt.% TiB 2 and 4 wt.% ZrO 2 , illustrating nanoscale dispersion; (B) Composite containing 5 wt.% TiB 2 and 6 wt.% ZrO 2 , highlighting the impact of increased zirconia content on particle agglomeration and size variation.

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