Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

Jia-hong Zhang; Shu-ming Xing; Xiao-hui Ao; Peng Sun; Ru-fen Wang

doi:10.1007/s12613-019-1838-1

Volume 26 Issue 11

Nov. 2019

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文章导航 > 矿物冶金与材料学报（英文） > 2019 > 26(11): 1457-1466

Jia-hong Zhang, Shu-ming Xing, Xiao-hui Ao, Peng Sun, and Ru-fen Wang, Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1457-1466. https://doi.org/10.1007/s12613-019-1838-1

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Jia-hong Zhang, Shu-ming Xing, Xiao-hui Ao, Peng Sun, and Ru-fen Wang, Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1457-1466. https://doi.org/10.1007/s12613-019-1838-1

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研究论文

Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Tianjin Lizhong Alloy Group Company Limited, Tianjin 300457, China

通讯作者:
Shu-ming Xing E-mail: smxing@bjtu.edu.cn

中文摘要

The effect of Ca addition on the elemental composition, microstructure, Brinell hardness and tensile properties of Al-7Si-0.3Mg alloy were investigated. The residual content of Ca in the alloy linearly increased with the amount of Ca added to the melt. The optimal microstructure and properties were obtained by adding 0.06wt% Ca to Al-7Si-0.3Mg alloy. The secondary dendrite arm spacing (SDAS) of the primary α phase decreased from 44.41 μm to 19.4 μm, and the eutectic Si changed from coarse plates to fine coral. The length of the Fe-rich phase (β-Al₅FeSi) decreased from 30.2 μm to 3.8 μm, and the Brinell hardness can reach to 66.9. The ultimate tensile strength, yield strength, and elongation of the resulting alloy increased from 159.5 MPa, 79 MPa, and 2.5% to 212 MPa, 86.5 MPa, and 4.5%, respectively. The addition of Ca can effectively refine the primary α phase and modify the eutectic Si phase, likely because Ca enrichment at the front of the solid-liquid interface led to undercooling of the alloy, reduced the growth rate of the primary α phase, and refined the grain size. Also, it could increase the latent heat of crystallization, undercooling, and the nucleation rate of eutectic Si, which was beneficial to the improvement of the morphology of eutectic Si.

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Research Article

Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

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Abstract

Abstract

The effect of Ca addition on the elemental composition, microstructure, Brinell hardness and tensile properties of Al-7Si-0.3Mg alloy were investigated. The residual content of Ca in the alloy linearly increased with the amount of Ca added to the melt. The optimal microstructure and properties were obtained by adding 0.06wt% Ca to Al-7Si-0.3Mg alloy. The secondary dendrite arm spacing (SDAS) of the primary α phase decreased from 44.41 μm to 19.4 μm, and the eutectic Si changed from coarse plates to fine coral. The length of the Fe-rich phase (β-Al₅FeSi) decreased from 30.2 μm to 3.8 μm, and the Brinell hardness can reach to 66.9. The ultimate tensile strength, yield strength, and elongation of the resulting alloy increased from 159.5 MPa, 79 MPa, and 2.5% to 212 MPa, 86.5 MPa, and 4.5%, respectively. The addition of Ca can effectively refine the primary α phase and modify the eutectic Si phase, likely because Ca enrichment at the front of the solid-liquid interface led to undercooling of the alloy, reduced the growth rate of the primary α phase, and refined the grain size. Also, it could increase the latent heat of crystallization, undercooling, and the nucleation rate of eutectic Si, which was beneficial to the improvement of the morphology of eutectic Si.
- Ca;
- Al-Si-Mg alloy;
- microstructure;
- mechanical properties

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Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

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Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

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