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<p>A novel and practical criterion, termed the temperature field cracking susceptibility coefficient (CSC<sub>T</sub>), has been introduced for the theoretical evaluation of the hot tearing susceptibility of magnesium (Mg) alloys, building upon Clyne and Davies’ framework. The criterion is presented as: CSC<sub>T</sub>-S=(<i>t</i><sub>V</sub>·<i>t</i><sub>Vn</sub>)/(<i>t</i><sub>R</sub>·<i>t</i><sub>coh</sub>) for Mg alloys with a short freezing range and CSC<sub>T</sub>-L=(<i>t</i><sub>V</sub>·<i>t</i><sub>coh</sub>)/<i>t</i><sub>R</sub> for Mg alloys with a long freezing range, where the vulnerable time period (<i>t</i><sub>V</sub> and <i>t</i><sub>Vn</sub>), strain-relaxation time period (<i>t</i><sub>R</sub>), and whole coherency time period (<i>t</i><sub>coh</sub>) in CSC<sub>T</sub> are redefined according to the mushy zone of the whole constrained rod, combining thermodynamic calculation and numerical simulation of the temperature field. Experimental validation was conducted using constrained rod casting on Mg-Gd-Y and Mg-Zn-Al ternary alloys. The CSC<sub>T</sub>-S and CSC<sub>T</sub>-L can precisely evaluate the hot tearing susceptibility (HTS) of Mg-Gd-Y and Mg-Zn-Al alloys, respectively. It indicates that the description of the mushy zone during solidification by the temperature field is an effective way to precisely evaluate the HTS of Mg alloys.</p>

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A Hot Tearing Criterion Incorporating Casting Temperature Field for Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Bingcheng Li,
  • Ruyue Tang,
  • Fanwei Zeng,
  • Wei Zhang,
  • Yipeng Zou,
  • Qian Yang

摘要

A novel and practical criterion, termed the temperature field cracking susceptibility coefficient (CSCT), has been introduced for the theoretical evaluation of the hot tearing susceptibility of magnesium (Mg) alloys, building upon Clyne and Davies’ framework. The criterion is presented as: CSCT-S=(tV·tVn)/(tR·tcoh) for Mg alloys with a short freezing range and CSCT-L=(tV·tcoh)/tR for Mg alloys with a long freezing range, where the vulnerable time period (tV and tVn), strain-relaxation time period (tR), and whole coherency time period (tcoh) in CSCT are redefined according to the mushy zone of the whole constrained rod, combining thermodynamic calculation and numerical simulation of the temperature field. Experimental validation was conducted using constrained rod casting on Mg-Gd-Y and Mg-Zn-Al ternary alloys. The CSCT-S and CSCT-L can precisely evaluate the hot tearing susceptibility (HTS) of Mg-Gd-Y and Mg-Zn-Al alloys, respectively. It indicates that the description of the mushy zone during solidification by the temperature field is an effective way to precisely evaluate the HTS of Mg alloys.