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Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2019-11-11 , DOI: 10.1007/s12613-019-1838-1
Jia-hong Zhang , Shu-ming Xing , Xiao-hui Ao , Peng Sun , Ru-fen Wang

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 um, 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.



中文翻译:

Ca改性对Al-7Si-0.3Mg合金元素组成,显微组织和拉伸性能的影响

研究了Ca添加对Al-7Si-0.3Mg合金元素组成,显微组织,布氏硬度和拉伸性能的影响。合金中Ca的残留含量随添加到熔体中的Ca含量线性增加。通过向Al-7Si-0.3Mg合金中添加0.06wt%的Ca,可以获得最佳的组织和性能。主要α相的次生枝晶臂间距(SDAS)从44.41μm减小至19.4μm,共晶Si从粗板变为细珊瑚。该富Fe相(β-Al的长度5FeSi)从30.2μm降低到3.8 um,布氏硬度可以达到66.9。所得合金的极限抗拉强度,屈服强度和伸长率分别从159.5 MPa,79 MPa和2.5%增加到212 MPa,86.5 MPa和4.5%。Ca的添加可以有效地细化初生α相并改性共晶Si相,这可能是因为固液界面前部的Ca富集导致合金过冷,降低了初生α相的生长速率并进行了细化。晶粒尺寸。而且,它可以增加结晶潜热,过冷和共晶硅的成核速率,这有利于改善共晶硅的形态。

更新日期:2019-11-11
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