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Effects of trace ytterbium addition on microstructure,mechanical and thermal properties of hypoeutectic Al-5Ni alloy

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Journal of Rare Earths 2022年第8期40卷 1305-1315页

作者： Kang Wang Shaodong Hu Yanglin Zhong Shuoxun Jin Zirong Zhou Zhiyu Wang Jiongcai Chen Bingbing Wan Wenfang Li School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China Institute of Science and Technology Innovation Dongguan University of TechnologyDongguan 523808China

Over the past decade,the cast aluminum alloys with excellent mechanical and conductivity properties have emerged as potential materials for thermal ***,the traditional Al-Si based alloys are difficult to make significant breakthrough in conductivity *** hypoeutectic Al-5Ni alloy also possesses sound castability and is expected to be applied in thermal management *** this study,the effects of ytterbium(Yb element) at 0-0.5 wt% on the microstructures as well as the electrical/thermal conductivity and mechanical properties of the Al-5Ni alloy were systematically *** experimental results indicate that the addition of Yb at a relatively low amount not only reduces the secondary dendrite arm spacing of the α-Al grains,but also modifies the morphology and distribution of eutectic boundary ***,it is found that the dosage of Yb at 0.3 wt% in the Al-5Ni alloy can simultaneously improve the yield strength,ultimate tensile strength and electrical/thermal *** strengthening and toughening of the Al-5Ni alloy are mainly attributed to the decrease of secondary dendrite arm spacing and the improvement of eutectic *** transmission electron microscopy/selected area electron diffraction(TEM/SAED) analysis indicates that the ytterbium in Al-5Ni alloy will form Al_(3)Yb phase,which mainly agglomerates in the Al_(3)Ni phase *** phase is helpful to decrease the solubility of impurity elements(e.g.,Fe and Si) in the α-Al matrix,which is beneficial to electrical/thermal *** value of this study lays foundation for manufacturing Al-Ni alloys with high thermal conductivity and acceptable mechanical properties.

关键词： Aluminum alloys Ytterbrium trace dosage Mechanical properties Thermal conductivity Rare earths

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