Abstract
A new severe plastic deformation for manufacturing Al/Mg bimetallic tube called the TES (tube extrusion shearing) process, which combines direct extrusion with two-step shearing, has been developed to manufacture Al/Mg bimetallic tube. Load evolution with stroke at different temperatures has been simulated by establishing three-dimensional finite element simulation of the TES process of Al/Mg bimetallic tubes. To explore the deformation mechanisms of the Al/Mg bimetallic tube during the TES process, the microstructures and phase compositions and microhardnesses of the bonded layer have been observed and analyzed. A higher extrusion temperature would decrease the extrusion loads. Defects of bonding layer appear less if the extrusion temperature is higher, and the bonding layer of the bi-metal tube has better quality. Three eutectic compounds, Mg2Al3, MgAl, and Mg17Al12, can be formed in the interface transition zone. The average hardness of the bonding layer is very high. The results indicate that the TES process can produce large plastic deformation and manufacture Al/Mg bimetallic tube and improve the bonding layer.
Highlights
The micro-structures and mechanical properties of the bonded layer were analyzed, The results showed that under the extrusion temperature of 420°C, the bonding layer of the sample obtained by extrusion shearing had no hole defects, and the thickness was about 22um, among which the stable layer was about 11um.The average hardness of the bonding layer is 221HV
Magnesium alloys have characteristic of low density, high specific strength and excellent machinability etc., which is known as a green material for sustainable development of resource and environment in the 21st century[1,2,3,4].It is widely used in aerospace, automobile,3C electronics and precision instrument industries[5].The crystal structure of magnesium alloy is inherent hexagonal close-packed (HCP), which have few slip system and poor plastic deformation ability, which hinders its wide application in various fields at room temperature
All kinds of comprehensive properties need to be considered when two kinds of materials are selected for composite forming, so that the bimetallic composite material that meets our requirements[12].The experimental material is commercial AZ31 magnesium and AA6063 aluminum, The chemical composition of AZ31 magnesium alloy and AA6063 aluminum alloy used in this study is shown in the table 1.The magnesium material was cut into specimens with 80mm length, inner diameterφ20.2mm,outer diameterφ24.8mm,respectively.The aluminum was cut into specimens with 80mm length, inner diameterφ24.9mm, outer diameterφ39.7mm,respectively
Summary
Magnesium alloys have characteristic of low density, high specific strength and excellent machinability etc., which is known as a green material for sustainable development of resource and environment in the 21st century[1,2,3,4].It is widely used in aerospace, automobile,3C electronics and precision instrument industries[5].The crystal structure of magnesium alloy is inherent hexagonal close-packed (HCP), which have few slip system and poor plastic deformation ability, which hinders its wide application in various fields at room temperature. Magnesium alloy is light weight and non-corrosion resistant, while aluminum alloy is the opposite. Both metals have their own advantages, combine the advantages of the two metals. The aluminum alloy and magnesium alloy were extruded to produce a bimetallic composite with magnesium as the inner layer and aluminum as the outer layer
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