Abstract
In this work, the thermophysical properties of a novel high pressure die casting (HPDC) Mg–RE (Mg–6Y–3Zn–1Al, WZA631 in wt pct) alloy are well investigated at the range of 298–673 K, compared with common HPDC AE44 alloy. Results show that the thermal expansion coefficients and thermal conductivity of AE44 and WZA631 alloys have similar temperature dependence, i.e., their values increase with temperature. At the same condition, the AE44 alloy exhibits higher thermal conductivity, while the WZA631 alloy has a lower expansion coefficient (better thermal stability). The lower thermal expansion coefficient of the WZA631 alloy is associated with the improved matrix deformability due to Y atoms and the strong barrier effect provided by the uniformly distributed long period stacking ordered (LPSO) phase. For the higher thermal conductivity of the AE44 alloy, trace cell boundary defects and solute-induced weak lattice distortions are major contributors. The numerical thermal conductivity models for both alloys are established based on Matthiessen’s rule, which presents reasonable consistency with experimental data, having correlation factors of R2 = 0.99. Also, with respect to some available gravity casting/die casting Mg alloys, the developed die casting WZA631 alloy demonstrates great merits from aspects of thermophysical properties, strength, and plasticity.
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Acknowledgments
This work was supported by the National Key Research and Development Program of China [Grant Numbers 2016YFB0301001 and 2016YFB0700502]. The authors also thank Prof. Shoumei Xiong from the School of Materials Science and Engineering, Tsinghua University, for his help in alloy preparation and data processing.
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Bai, Y., Ye, B., Yu, X. et al. Thermophysical Properties of a New HPDC Mg–RE-Based Alloy: Comparative Study to Conventional AE44 Alloy. Metall Mater Trans A 53, 4258–4271 (2022). https://doi.org/10.1007/s11661-022-06820-0
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DOI: https://doi.org/10.1007/s11661-022-06820-0