Abstract
To control the microstructure and simulate the forming process of semisolid powder molding, the deformation micromechanisms and constitutive behaviors of powder materials were analyzed. Experiments including thermal simulation compression under the semisolid state and semisolid powder molding were carried out. The results show a rapid increase to the peak stress with elastic–plastic deformation occurring in stage I. In stage II, the powder material experiences rheological viscoplastic deformation under stable stress, and shear-induced contraction occurs. In stage III, an abrupt drop in stress and shear-induced dilation occurs, forming more defects. As the liquid fraction increases, the strain causing pore elimination and powder compaction decreases. The critical strain contraction-to-dilation transition decreases, which is completely opposite to that of dense materials. The modified constitutive equation of Mg-6Zn green compaction describes the semisolid compression behavior very well. Pseudo-transgranular liquation cracking (TLC) is the grain refinement mechanism, and the optimum compaction ratio is 20–30%.
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The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 51704255) and Sichuan Science and Technology Program (No. 2020YFH0151).
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Xia Luo, Mingyu Li, Jun Ren, and Min Wu contributed to the methodology, formal analysis, investigation, and data curation. Bensheng Huang was involved in the equipment design. Xia Luo and Yuliang Zhao contributed to the supervision, writing original draft, methodology design, and funding acquisition.
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Luo, X., Li, M., Ren, J. et al. Deformation Micromechanism and Constitutive Analysis Behind the Semisolid Powder Compression of Medical Mg-Zn Alloy. JOM 74, 899–908 (2022). https://doi.org/10.1007/s11837-021-05053-7
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DOI: https://doi.org/10.1007/s11837-021-05053-7