Abstract
A coarse-grained microstructure of solution treated AlMg5 aluminium alloy was prepared by equal channel angular pressing through route BC. Microstructure evolution of the alloy was analysed by using an optical microscope, X-ray diffraction, and EBSD (electron backscatter diffraction). The results reported that grains were refined due to the interactions of shear bands with low-to-moderate grain boundaries, and this structure was transformed into a bimodal after ageing at 180 °C for 4 h. Moreover, the results of the tensile testing showed that the yield strength was increased from 110 to 326 MPa, and the corresponding tensile strength increased from 269 to 395 MPa, maintaining an appropriate elongation of ~18%. After ageing at 180 °C elongation increased to 23% and the sample still kept high yield strength of 255 MPa, which may be associated with the mutual influence of the dislocation density decrease and recrystallization processes.
Highlights
In recent years, various severe plastic deformation techniques (SPD) have been used for producing ultrafine-grained materials (UFG)
Aluminium alloys are mostly used for fabrication UFG microstructures using severe plastic deformation techniques; it is because good workability of aluminium and low required deformation force
The present study aims to offer and explore a simple approach, i.e., room temperature equal channel angular pressing (ECAP) combined with post-ECAP ageing, to prepare bulk fine-grained
Summary
Various severe plastic deformation techniques (SPD) have been used for producing ultrafine-grained materials (UFG). Equal channel angular pressing (ECAP) [1], repetitive corrugation and straightening (RCS) [2], high-pressure torsion (HPT) [3], cyclic extrusion compression (CEC) [4], and accumulative roll bonding (ARB) [5] have been widely applied to produce fine-grained microstructures. Due to the exceptional properties, such as extremely high strength, UFG metals are very interesting to materials scientists. Aluminium alloys are mostly used for fabrication UFG microstructures using severe plastic deformation techniques; it is because good workability of aluminium and low required deformation force.
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