Effects of Amplitude of Die Vibration on Cast Structure of Al4.5Cu Alloy
作者： Meet C. Mehta , Durbadal Mandal , Sujoy K. Chaudhury
DOI: 10.1007/S40962-018-0271-Y
关键词:
摘要: The effect of mechanical vibration on structural evolution during gravity die casting Al4.5Cu (LM11) alloy was studied. Two types were used to cast alloy, namely top gating and bottom die. preheated placed a vibrating table prior casting. frequency 50 Hz. amplitude varied 0.5 mm, 0.75 mm, 1.05 mm understand the role evolution. When increased greater than 1.05 mm, it generated higher degree turbulence which resulted in splashing molten metal out consequently difficult alloy. For comparative purpose, castings produced without Microscopic examination showed progressive microstructural transformation from predominantly dendritic structure globularized primary α-Al with vibration. In addition, refinement reduction microsegregation Cu matrix. average grain size under at 50 Hz whereas that stationary 2.1 mm. Further, reduced eutectic Al2Cu phase 10.23 μm (without vibration) 6.75 μm (with 1.05 mm). is because caused forced convection melt cooling rate solidification. evidence high noted secondary arms spacing (SDAS) values. SDAS value less as compared die, correspondingly calculated Significant shrinkage porosity observed their density those This attributed increase flowability due fragmentation dendrites form amount microstructure solidification
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