• Chinese Journal of Lasers
  • Vol. 47, Issue 8, 802006 (2020)
Zhang Yujie1、2, Yu Meihua1, Yang Ruixia1、2, Yang Weiwei1、2, Wei Jingquan1、2, Wei Yuezhou1、2, and Li Weizhou1、2、*
Author Affiliations
  • 1School of Resources, Environment and Materials, Guangxi University, Nanning, Guangxi 530004, China
  • 2Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials,Nanning, Guangxi 530004, China
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    DOI: 10.3788/CJL202047.0802006 Cite this Article Set citation alerts
    Zhang Yujie, Yu Meihua, Yang Ruixia, Yang Weiwei, Wei Jingquan, Wei Yuezhou, Li Weizhou. Effects of Rare Earth Sc on Properties of Laser-Melted AlSi10Mg Alloy[J]. Chinese Journal of Lasers, 2020, 47(8): 802006 Copy Citation Text show less

    Abstract

    Herein, AlSi10Mg alloy with different Sc contents were prepared by laser melting using a spot size of 2 mm. Further, the influences of Sc content on the microstructure and mechanical properties of the AlSi10Mg alloy were studied using metallographic microscope, scanning electron microscope, X-ray diffractometer, micro-hardness tester, and electronic universal material testing machine. The results showed that α-Al phase and Si phase were the main phases in the alloy. The α-Al dendrites in the alloy were refined and gradually transformed to equiaxed grain when the Sc mass fraction was increased from 0 to 0.2%. Meanwhile, the morphology of the Si phase changed from fibrous to particulate. In addition, the densification, mechanical properties, and thermal stability of the alloy were improved significantly. When the mass fraction of Sc was 0.2%, the densification of the alloy reached about 98.39%, the main rare earth phase in the alloy was Al3Sc, and the microhardness, plastic compression Rpc0.2 and compressive strength corresponding to 25% of the deformation were improved by 19.4%, 23.1%, and 17.5% compared with the alloy without Sc, respectively. When the Sc mass fraction exceeded 0.2%, the grain of the alloy coarsened and the optimization effect of Sc with respect to the alloy decreased. The alloy exhibited a finer microstructure and better mechanical properties when compared with those alloy prepared using the traditional process because of the high energy and fast cooling associated with the laser melting process. With the addition of rare earth Sc, the mechanical properties of the alloy were further improved with the help of solid solution strengthening. The mechanical properties of the alloy were worse than those of the alloy prepared using a laser with a micrometer spot size because of the large spot size considered in the experiment.
    Zhang Yujie, Yu Meihua, Yang Ruixia, Yang Weiwei, Wei Jingquan, Wei Yuezhou, Li Weizhou. Effects of Rare Earth Sc on Properties of Laser-Melted AlSi10Mg Alloy[J]. Chinese Journal of Lasers, 2020, 47(8): 802006
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