上海交通大学学报(英文版) ›› 2012, Vol. 17 ›› Issue (3): 301-305.doi: 10.1007/s12204-012-1273-1

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Grain Refining Mechanism of Carbon Inoculation on Mg-Al Alloy

LI Ke (李克), WANG Fei (王飞), WANG Qian (王倩), ZHOU Nai-geng (周耐根)   

  1. (School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China)
  • 出版日期:2012-06-30 发布日期:2012-11-15
  • 通讯作者: LI Ke (李克) E-mail: like.1@126.com

Grain Refining Mechanism of Carbon Inoculation on Mg-Al Alloy

LI Ke (李克), WANG Fei (王飞), WANG Qian (王倩), ZHOU Nai-geng (周耐根)   

  1. (School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China)
  • Online:2012-06-30 Published:2012-11-15
  • Contact: LI Ke (李克) E-mail: like.1@126.com

摘要: The processing parameters and refining mechanism of Mg-Al alloy treated with a newly developed carbon inoculant under different conditions were investigated experimentally in this work. Results show that the finest α-Mg grain in AZ91D alloy can be obtained after processing at about 740℃, and the average grain size of α-Mg grain decreases from about 180.4 to 85.6 μm by adding mass fraction win = 1% inoculant into melt. However, no evident refinement was achieved with excessive inoculant for Mn-free Mg-9Al alloy. Scanning electron microscope (SEM) photo, energy dispersive spectroscopy (EDS) analysis on the Mn-contained intermediate phase and differential scanning calorimetry (DSC) results indicate that Mn element plays an important role in the heterogeneous nucleation of α-Mg grain. In the early stage of solidification, Al-Mn-C compound particles formed on the surface of Al4C3 nano-particles should be the potential nuclei for primary α-Mg and probably responsible for the grain refinement achieved in the carbon inoculation process.

关键词: magnesium alloy, carbon inoculant, heterogeneous nucleation

Abstract: The processing parameters and refining mechanism of Mg-Al alloy treated with a newly developed carbon inoculant under different conditions were investigated experimentally in this work. Results show that the finest α-Mg grain in AZ91D alloy can be obtained after processing at about 740℃, and the average grain size of α-Mg grain decreases from about 180.4 to 85.6 μm by adding mass fraction win = 1% inoculant into melt. However, no evident refinement was achieved with excessive inoculant for Mn-free Mg-9Al alloy. Scanning electron microscope (SEM) photo, energy dispersive spectroscopy (EDS) analysis on the Mn-contained intermediate phase and differential scanning calorimetry (DSC) results indicate that Mn element plays an important role in the heterogeneous nucleation of α-Mg grain. In the early stage of solidification, Al-Mn-C compound particles formed on the surface of Al4C3 nano-particles should be the potential nuclei for primary α-Mg and probably responsible for the grain refinement achieved in the carbon inoculation process.

Key words: magnesium alloy, carbon inoculant, heterogeneous nucleation

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