Abstract
A magnesium alloy AZ31 as plate of dimensions (60 x 60 x 3) mm has been constrained groove pressed (CGP) four deformation passes (16 pressings) at 250 oC by simulation and experiments. On the basis of the analysis of calculation results about the deformation distribution in the alloy AZ31 workpieces, the mechanism for its microstructure evolution during the severe plastic deformation (SPD) process was partly clarified. On the other hand, deformation heterogeneity distribution developed in the workpieces by applying CGP caused the evolution of a non-uniform microstructure. The TEM microstructure analysis results provided clear evidence that across the plate both the banded deformed microstructure where dislocation cell structure and/or partially or fully recovered polygonized subgrain microstructure are present. The recovering dynamic and local polygonization process contributes significantly to the formation of ultra-fine materials (UFG) microstructure.
Highlights
Magnesium alloy is considered as an advanced material for many applications, especially in automotive, rail and aviation industries, with a low density advantage (1.74 g/cm3) and high thermal conductivity [1,2,3]
Severe plastic deformation has been regarded as a viable method for producing nanostructured or ultra-fine materials [6,7,8,9]
A severe plastic deformation method with great potential for the production of ultra-fine materials has been developed as a constrained groove pressed (CGP) [13, 14]
Summary
Magnesium alloy is considered as an advanced material for many applications, especially in automotive, rail and aviation industries, with a low density advantage (1.74 g/cm3) and high thermal conductivity [1,2,3]. The amount of plastic strain is dependent on the number of times and die geometry such as groove angle under the plane strain shear deformation using the equation (1.) of effective strain [18]. The selection of samples after the 8 deformation passes (16 pressings) were done from the top of the groove, which relates to an “undeformed” region (1), and from the inclined region, which relates to a sheared area, where equivalent strain of ε ~ 4.5 was achieved (2 and 3), is shown in Fig. 5 (a).
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