Influence of Accumulative Roll Bonding on the Texture and Tensile Properties of an AZ31 Magnesium Alloy Sheets

Abstract

Deformation behaviour of rolled AZ31 sheets that were subjected to the accumulative roll bonding was investigated. Substantially refined microstructure of samples was achieved after the first and second pass through the rolling mill. Sheets texture was investigated using an X-ray diffractometer. Samples for tensile tests were cut either parallel or perpendicular to the rolling direction. Tensile tests were performed at temperatures ranging from room temperature up to 300 °C. Tensile plastic anisotropy, different from the anisotropy observed in AZ31 sheets by other authors, was observed. This anisotropy decreases with an increasing number of rolling passes and increasing deformation temperature. Grain refinement and texture are the crucial factors influencing the deformation behaviour.

Thermal Conductivity of an AZ31 Sheet After Accumulative Roll Bonding

“…Mostly, binary and ternary magnesium alloys consist of -grains containing the solid solution of the alloying elements in Mg and various phases. Generally, the thermal conductivity depends on their composition and thermal history [9,11,[13][14][15][16][17][18][19][20][21][22][23][24][25]. Results of these studies were ambiguous.…”

“…Results of these studies were ambiguous. Ying et al [9] [11]. For Zn contents higher than 1wt.%, the thermal conductivity increases with increasing temperature from 303 up to 513 K. Precipitation of the second phase particles increases the thermal conductivity due to purification of the matrix [21].…”

“…The texture influence on properties of hexagonal magnesium materials is significant due to large anisotropy of magnesium itself. The anisotropy of mechanical properties has been reported several times in the literature [7][8][9]. On the other hand, the developed texture affects not only mechanical properties (strength, modulus) but also physical properties (thermal expansion coefficient, internal friction, electrical resistivity).…”

Thermal Conductivity of an AZ31 Sheet after Accumulative Roll Bonding

“…The texture influence on properties of hexagonal magnesium materials is significant due to large anisotropy of magnesium itself. The anisotropy of mechanical properties has been reported several times in the literature [7][8][9]. Furthermore, the developed texture affects not only mechanical properties (strength, modulus) but also physical properties (thermal expansion coefficient, internal friction, electrical resistivity).…”

Study of the Microstructure, Tensile Properties and Hardness of AZ61 Magnesium Alloy Subjected to Severe Plastic Deformation

“…This plastic deformation technologies consists of transforming the micrometric structure of coarse-grained materials into ultra-fine (UFG with grain size 100-1000 nm) and/or nanometric materials (grain size < 100 nm) by re-organizing the dislocation structure created during plastic deformation [5,6]. Standard examples of methods of severe plastic deformation are ECAP [7][8][9], High-Pressure Torsion (HPT) [10], Accumulative Roll Bonding (ARB) [11], Cyclic Extrusion Compression (CEC) [12], or Hydrostatic Extrusion (HE) [13]. Severe plastic deformation methods in contrast to conventional technologies of plastic deformation are not used to shape the initial material, but primarily to transform the coarse-grained microstructure into ultra-fine or nanometric microstructure [14].…”