Abstract
Semi-solid powder forming (SPF) has been widely used to prepare metal matrix composites, during which powder breakage plays an important role in grain refinement and densification process. However, it is not easy to directly observe because of the complicated SPF process, resulting in few investigations. Therefore, based on semisolid compression of AA2024 porous materials, powder breakage behavior and mechanism were studied by introducing the continuity, capillary force, and Newtonian fluid and Roscoe–Einstein model in this work. The results indicate that when the continuity CSS≈1, the powders are not crushed, the liquid solidified as short-rod shapes distributing within a powder is regarded as small holes, and its influence is ignored. When CSS = 0.384–0.608, the powders break up along grain boundaries partially occupied by liquid, with their solid-bonding being torn open, resulting in transgranular ruptures. Its breakage resistance is the combined force acted by the solid-bonding and liquid. When CSS < 0.384, the solid grains are wrapped by liquid with few deformation resistances, regarded as a Newtonian fluid. The breakage resistance of semi-solid powders was calculated by the deduced mathematical equation, and it further confirmed the above results. The breakage coefficient representing the broken degree was calculated and then proved to be consistent with experimental results.
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Acknowledgements
The authors appreciate the financial support from Science and Technology Planning Projects of Guangzhou (202102080110), Sichuan Science and Technology Program (2020YFH0151), Guangdong Province Nature Foundation (2022A1515011065), and Guangdong Polytechnic Normal University talent scientific research launch project (2021SDKYA006).
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Wu, M., Liu, J., Luo, X. et al. The Powder Breakage Behavior and Mechanism During Semi-solid Powder Forming. JOM 75, 2511–2524 (2023). https://doi.org/10.1007/s11837-023-05868-6
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DOI: https://doi.org/10.1007/s11837-023-05868-6