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Interface characteristics of Mg/Al bimetal produced by a novel liquid-liquid compound casting process with an Al interlayer

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Abstract

Mg/Al bimetal was successfully prepared using a novel lost-foam casting (LFC) liquid-liquid compound process with an Al interlayer, and the interface characteristics including microstructure, mechanical properties, and fracture behavior of the Mg/Al bimetal were investigated in this paper. The results show that the mixing of AZ91D and A356 liquid metals was fully avoided by using the Al interlayer. A metallurgical bonding between the AZ91D alloy matrix and the A356 alloy matrix was achieved, obtaining a compact interface. The interface was constituted by the Al12Mg17 + δ (Mg) eutectic and the Al3Mg2 and Mg2Si reaction layers, which were respectively next to the AZ91D alloy matrix and the A356 alloy matrix. The reaction layers had much higher microhardnesses compared with the microhardnesses of the matrixes, and the highest microhardness up to 275–299 HV was obtained in the reaction layer next to the Al matrix. A brittle fracture morphology was observed in the fractured surface of the Mg/Al bimetal, and the fracture mainly initiated with the fracture of the reaction layer close to the Al matrix.

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Funding

This study is supported by the National Natural Science Foundation of China (Nos. 51775204 and 51204124), the fund of the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201821), the Natural Science Foundation of Hubei Province, China (No. 2017CFB488), and the Analytical and Testing Center, HUST.

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Authors and Affiliations

  1. State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China

    Qiang Hu, Zailiang Jiang, Wenming Jiang, Guangyu Li, Feng Guan, Haixiao Jiang & Zitian Fan

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  1. Qiang Hu
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  2. Zailiang Jiang
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  3. Wenming Jiang
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  4. Guangyu Li
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  7. Zitian Fan
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Correspondence to Wenming Jiang.

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Hu, Q., Jiang, Z., Jiang, W. et al. Interface characteristics of Mg/Al bimetal produced by a novel liquid-liquid compound casting process with an Al interlayer. Int J Adv Manuf Technol 101, 1125–1132 (2019). https://doi.org/10.1007/s00170-018-2990-x

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