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Metals 2019, 9(2), 153; https://doi.org/10.3390/met9020153

Compressive Properties of A2024 Alloy Foam Fabricated through a Melt Route and a Semi-Solid Route

1
Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan
2
Kagami Memorial Research Institute of Materials Science and Technology, Waseda University,2-8-26 Nishi-Waseda, Shinjuku, Tokyo 169-0051, Japan
*
Author to whom correspondence should be addressed.
Received: 14 December 2018 / Revised: 22 January 2019 / Accepted: 22 January 2019 / Published: 29 January 2019
(This article belongs to the Special Issue Cellular Metals: Fabrication, Properties and Applications)
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Abstract

A2024 alloy foams were fabricated by two methods. In the first method, the melt was thickened by Mg, which acts as an alloying element (melt route). In the second method, the melt was thickened by using primary crystals at a semi-solid temperature with a solid fraction of 20% (semi-solid route). A2024 alloy foams fabricated through the semi-solid route had coarse and uneven pores. This led to slightly brittle fracture of the foams, which resulted in larger energy absorption efficiency than that of the foams fabricated through the melt route. Moreover, A2024 alloy foams fabricated through the semi-solid route had a coarser grain size because of the coarse primary crystals. However, by preventing the decrease in the alloying element Mg, the θ/θ’ phase was suppressed. Additionally, by preventing the precipitation of the S′ phase, the amount of Guinier-Preston-Bagaryatsky (GPB) zone increased. This resulted in a larger plateau stress. View Full-Text
Keywords: semi-solid; aluminum foam; primary crystals; compression test; pore morphology; precipitation phase; age hardening semi-solid; aluminum foam; primary crystals; compression test; pore morphology; precipitation phase; age hardening
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Kuwahara, T.; Osaka, T.; Saito, M.; Suzuki, S. Compressive Properties of A2024 Alloy Foam Fabricated through a Melt Route and a Semi-Solid Route. Metals 2019, 9, 153.

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