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<p>Advanced Mg–Y–Zn alloys exhibit great engineering attractiveness owing to their high strength and good thermal stability. Here, the thermal expansion coefficients and thermal conductivity of Mg–Y–Zn alloys with varying phase components (I, W, and LPSO phases) are systematically investigated at 298&#xa0;K to 673&#xa0;K. The results reveal that the continuous structure of LPSO phase more effectively restricts the thermal expansion of Mg matrix compared to the high modulus of I phase. The coherent interface of LPSO phase with Mg matrix introduces a broader stress field than the non-coherent interfaces of I and W phases, causing serious lattice strains. Notably, the discrete distribution of I phase mitigates lattice distortions caused by impurity defects and thus improves the mobility of heat carriers. As a consequence, the LPSO phase alloy possesses a low thermal expansion coefficient, while the I phase alloy obtains superior thermal conductivity. The W phase alloy has more balanced thermophysical properties. Furthermore, numerical equations about thermal conductivity are established based on the Maxwell model and Smith–Palmer principle, which well predict thermal conductivity of Mg–Y–Zn alloys and other Mg alloys, such as M–Al series and Mg–RE series alloys. These findings offer valuable guidance for realizing superior combinations of thermophysical properties in Mg alloys.</p>

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Thermophysical Properties for Mg–Y–Zn Alloys with Various Phase Types: Microstructural Role and Numerical Prediction

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Yang Bai,
  • Xinying Teng,
  • Bing Ye,
  • Gaoqi Wang,
  • Degang Zhao,
  • Weili Cheng

摘要

Advanced Mg–Y–Zn alloys exhibit great engineering attractiveness owing to their high strength and good thermal stability. Here, the thermal expansion coefficients and thermal conductivity of Mg–Y–Zn alloys with varying phase components (I, W, and LPSO phases) are systematically investigated at 298 K to 673 K. The results reveal that the continuous structure of LPSO phase more effectively restricts the thermal expansion of Mg matrix compared to the high modulus of I phase. The coherent interface of LPSO phase with Mg matrix introduces a broader stress field than the non-coherent interfaces of I and W phases, causing serious lattice strains. Notably, the discrete distribution of I phase mitigates lattice distortions caused by impurity defects and thus improves the mobility of heat carriers. As a consequence, the LPSO phase alloy possesses a low thermal expansion coefficient, while the I phase alloy obtains superior thermal conductivity. The W phase alloy has more balanced thermophysical properties. Furthermore, numerical equations about thermal conductivity are established based on the Maxwell model and Smith–Palmer principle, which well predict thermal conductivity of Mg–Y–Zn alloys and other Mg alloys, such as M–Al series and Mg–RE series alloys. These findings offer valuable guidance for realizing superior combinations of thermophysical properties in Mg alloys.