Microstructure and Mechanical Properties of Interfaces of Extruded Cladding Mg-Al RodsChinese Full Text
Qiao Jisen;Nie Shucai;Zhang Han;Zhao Wenjun;Xia Tiandong;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology;
Abstract: The rods of aluminum cladding magnesium alloys AZ31 were fabricated by cladding extrusion at different temperatures.During the process,the AZ31 magnesium alloys were coated by the aluminum. The composite,with bonding interface between aluminum and magnesium forming,was obtained. After the extrusion process,the microstructure evolution and mechanical properties of the cladding materials were analyzed by the optical microscope( OM) observation,scanning electronic microscopy( SEM) and energy dispersive spectrometer( EDS) tests. Emphasis was put on the microstructure and chemical composition distribution of the interface between aluminum and magnesium. Meanwhile,the microhardness was tested. The results showed that qualified products with smooth surface and no obvious defects could be made by extrusion. Elements diffusion in the composite layer occurred during the extrusion process,which caused a change of gradient of the element concentrations. An intermetallic layer was formed with thickness of 350 μm.Phase identification showed that the magnesium-rich phase close to the side of magnesium alloy was Al12Mg17 and the aluminum-rich phase close to the aluminum side was Al3Mg2,which were all brittle phases. Therefore,the hardness of Mg-Al bonding interface could be up to HV 200 or more compared to that of base metals. The inhomogeneous properties of the interface for the extrusion profiles caused poor load ability and the cracks to occur in the composites.
Keywords:
AZ31 magnesium alloy; pure aluminum; cladding technology; indirect extrusion; microstructure;
- DOI:
10.13373/j.cnki.cjrm.2015.06.001
- Series:
- Subject:
- Classification Code:
TG379;TB331
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