Microstructure, Mechanical Properties and Fracture Behavior of Magnesium/Steel Bimetal Using Compound Casting Assisted with Hot-Dip Aluminizing

Wenming Jiang; Haixiao Jiang; Guangyu Li; Feng Guan; Junwen Zhu; Zitian Fan

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자료유형: 학술저널

저자정보: Wenming Jiang (Huazhong University of Science and Technology) Haixiao Jiang (Huazhong University of Science and Technology) Guangyu Li (Huazhong University of Science and Technology) Feng Guan (Huazhong University of Science and Technology) Junwen Zhu (Huazhong University of Science and Technology) Zitian Fan (Huazhong University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.8

발행연도: 2021.1

수록면: 2,977 - 2,988 (12page)

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In this work, microstructure, mechanical properties and fracture behavior of the magnesium/steel bimetal using compoundcasting assisted with hot-dip aluminizing were investigated, and the interface bonding mechanism of the magnesium/steelbimetal were also analyzed. The results indicate that the magnesium/steel bimetal obtained without hot-dip aluminizing hadlarger gaps through the whole interface without reaction layers between magnesium and steel, leading to a poor mechanicalbonding. After the steel substrate was hot-dip aluminized, an intermetallic layer along with an Al topcoat layer wereformed on the surface of the steel substrate, and the intermetallic layer was constituted by Fe2Al5,τ10-Al9Fe4Si3, FeAl3andτ6-Al4.5FeSi phases. In the case of the magnesium/steel bimetal obtained with hot-dip aluminizing, a compact and uniforminterface layer with an average thickness of about 17 μm that consisted of Fe2Al5,τ10-Al9Fe4Si3, FeAl3and Al12Mg17intermetalliccompounds was formed between the magnesium and the steel, obtaining a superior metallurgical bonding. The interfacelayer had much higher nano-hardnesses compared to the magnesium and steel matrixes, and its average nano-hardness wasup to 11.1 GPa, while there were respectively 1.1 and 4.2 GPa for the magnesium and steel matrixes. The shear strength ofthe magnesium/steel bimetal with hot-dip aluminizing reached to 23.3 MPa, which increased by 8.59 times than that of thecomposites without hot-dip aluminizing. The fracture of the magnesium/steel bimetal with hot-dip aluminizing representeda brittle fracture nature, initiating from the interface layer.

#Magnesium · Steel · Bimetal · Aluminizing · Interface · Compound casting

참고문헌 (4)

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Won June Kim / 2018 / First-Principles Studies on Twinnability of Magnesium Alloys: Effects of Yttrium and Lithium on ( 101̄1)[1̄012] Compression Twinning Deformation Processes / Metals and Materials International 24(4):720~729

Zishan Yao / 2019 / Effects of Ni and Cr on Cryogenic Impact Toughness of Bainite/Martensite Multiphase Steels / Metals and Materials International 25(5):1151~1160

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