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

作者: Wenming Jiang , Haixiao Jiang , Guangyu Li , Feng Guan , Junwen Zhu

DOI: 10.1007/S12540-019-00606-7

关键词:

摘要: In this work, microstructure, mechanical properties and fracture behavior of the magnesium/steel bimetal using compound casting assisted with hot-dip aluminizing were investigated, interface bonding mechanism also analyzed. The results indicate that obtained without had larger gaps through whole reaction layers between magnesium steel, leading to a poor bonding. After steel substrate was aluminized, an intermetallic layer along Al topcoat formed on surface substrate, constituted by Fe2Al5, τ10-Al9Fe4Si3, FeAl3 τ6-Al4.5FeSi phases. case aluminizing, compact uniform average thickness about 17 μm consisted Al12Mg17 compounds obtaining superior metallurgical much higher nano-hardnesses compared matrixes, its nano-hardness up 11.1 GPa, while there respectively 1.1 4.2 GPa for matrixes. shear strength reached 23.3 MPa, which increased 8.59 times than composites aluminizing. represented brittle nature, initiating from layer.

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