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Effects of Grain Refinement on Tensile Properties and Precipitation Kinetics of Al-Si-Mg Alloys Cast in Sand Molds

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Abstract

Effects of grain refinement on the tensile properties and precipitation kinetics of Al-Si-Mg alloys cast in sand molds by co-alloying of La–B elements were investigated in this work. The kinetics of precipitation after refinement were investigated, including the changes of the precipitation mechanism and decrease of the precipitation activation energy. The reduction of the Avrami exponent indicates the major precipitation mechanism transforms in A359 alloys. Meanwhile, a modified aging process is obtained, which considerably promotes the mechanical properties.

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The authors appreciate the support from Jiangsu Key Laboratory for Advanced Metallic Materials (No. BM2007204).

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  1. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China

    Feiyang Chen, Tao Lu & Ye Pan

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  1. Feiyang Chen
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  2. Tao Lu
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Correspondence to Ye Pan.

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Manuscript submitted on March 17, 2020.

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Chen, F., Lu, T. & Pan, Y. Effects of Grain Refinement on Tensile Properties and Precipitation Kinetics of Al-Si-Mg Alloys Cast in Sand Molds. Metall Mater Trans B 51, 1933–1940 (2020). https://doi.org/10.1007/s11663-020-01910-z

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