Effect of Rare Earth Ce on Solidification Microstructure of ZL114A Aluminum Alloy AITranslate

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Chinese Library Classification Number:TG292[金属学及工艺—铸造]

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The influence of rare earth Ce on theα-Al grain size and eutectic Si morphology in the solidification microstructure,phase composition,and hardness of ZL114A aluminum alloy was investigated through a sand casting process simulation experiment.The results indicate that theα-Al grain size in the solidification microstructure of ZL114A aluminum alloy initially decreases and subsequently increases with the increase of the addition amount of rare earth Ce,while the Vickers hardness of the alloy exhibits an opposite trend of first increasing and then decreasing.The optimum mass fraction of rare earth Ce is 0.3%.Under this condition,the average grain sizes at the core and edge of the ingot decrease from the original 157μm and 143.2μm to 125.7μm and 122.6μm,respectively,corresponding to decreases of 19.9%and 14.4%.The morphology of eutectic Si transforms from the original lath shape to fine rod shape.Additionally,the addition of rare earth Ce promotes the preferred orientation growth of Al and Si atoms along the〈100〉and〈110〉directions.The Vickers hardness values at the core and edge of the ingot increase from the original 62.9 HV and 68.3 HV to 70.3 HV and 75.3 HV,respectively,corresponding to enhancements of 11.8%and 10.2%.