Synergistic Effect of In-Situ Al-7075/Al3Ti Metal Matrix Composites Prepared via Stir-Assisted Ultrasonic Melt Processing Under Dynamic Nucleation

S. V. Sujith; Hansoo Kim; Rahul S. Mulik; Hyeonwoo Park; Joonho Lee

doi:10.1007/s12540-021-01143-y

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자료유형: 학술저널

저자정보: S. V. Sujith (Korea University) Hansoo Kim (Korea University) Rahul S. Mulik (Indian Institute of Technology Roorkee) Hyeonwoo Park (Korea University) Joonho Lee (Korea University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.9

발행연도: 2022.9

수록면: 2,288 - 2,303 (16page)

DOI: 10.1007/s12540-021-01143-y

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Owing to the high propensity for particle agglomeration, the fabrication of aluminum matrix composites with uniformdistribution using casting routes is extremely difficult. In this study, the in-situ development of the Al3Tireinforcing phaseby employing stir-assisted ultrasonic treatment was utilized to improve the homogeneity, wettability, and thermodynamicstability of the reinforcing particles in an Al-7075 alloy matrix. The in-situ Al3Tiparticles acted as heterogeneous nucleationsites and facilitated grain refinement to form a non-dendritic globular structure compared with the dendritic cells of the basealloy. The grain size of the α-Al dendrites reduced from 160 μm to 65, 50, and 40 μm with the addition of 2, 5, and 7 wt%Al3Ti,respectively. The reduction in the porosity of the composites and the improvement of the particle homogenizationwere due to cavitation-induced de-agglomeration and the degassing effect. The formation of a robust and clean interfacebetween the Al3Tiparticles and Al alloy via ultrasonic vibration improved the integrity of the composites compared withthat of the base alloy. The thermal expansion mismatch between the Al3Tiparticles and Al alloy contributed significantly tothe improved mechanical properties of the composites.

#In-situ casting · In-situ composite · Ultrasonic cavitation · Heterogeneous nucleation · Strengthening mechanisms · Fractography

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