4.6 Article

Effect of cerium addition on microstructure, thermal and rheological properties of hypoeutectic Al-Ni alloy

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MATERIALS TODAY COMMUNICATIONS
卷 36, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.mtcomm.2023.106842

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Hypoeutectic Al -Ni alloy; Microstructure; Thermal conductivity; Shear rate; Rheological behavior

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The addition of Ce element can enhance the mechanical properties and electrical conductivity of Al-5Ni alloy, by reducing the recalescence and growth temperatures of the Al-Ni eutectic structure and obtaining a spherical structure. However, excessive addition of Ce may result in lower strength and thermal conductivity.
The microstructure, mechanical properties, electrical/thermal conductivity, and rheological behavior of Al-5Ni alloy with different Ce contents were systematically investigated. The experimental results demonstrate that an appropriate addition of Ce reduces the recalescence and growth temperatures of the Al-Ni eutectic structure, resulting in a reduction in precipitation phase size and the formation of a spherical Al3Ni eutectic structure. It leads to improvement in electrical conductivity and mechanical properties. But excessive addition of Ce leads to the formation of slatted Al23Ce4Ni6 on the Al-Ni eutectic boundary, causing the samples with higher Ce content to exhibit lower strength and thermal conductivity. Additionally, the investigation of alloy viscosity indicates significant shear thinning behavior of Al-Ni alloys, which contributes to obtaining uniformly filled and good quality cast products. The variation of melt viscosity suggested that Ce elements could improve the morphology and distribution of & alpha;-Al precipitates in the alloy, leading to an increase in viscosity in a specific temperature range.

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