Change of Microstructure and Mechanical Properties of Aluminum Grade A0 in the Process of Ecap
Fedorova T.
2021University of Chemical Technology and Metallurgy
Journal of Chemical Technology and Metallurgy
2021#56Issue 3648 - 652 pp.
The paper considers the relationship between the evolution of microstructure and mechanical properties of aluminum grade A0 in the process of equal channel angular pressing (ECAP) in a stepped matrix. The deformation was carried out at room temperature with the number of passes equal to 7. It was shown that grains obtained after 7 passes of deformation by the ECAP method are equiaxed, their size is 0.5 μm. It was also established that the strength of aluminum workpieces increases after 7 passes by almost 3 times. Ultimate tensile strength and offset yield strength increase from 145 MPa to 312 MPa (absolute increase is 167 MPa) and from 102 MPa to 307 MPa (absolute increase is 205 MPa), the elongation decreases from 41% to 30 %, respectively, the relative reduction decreases from 52 % to 27 %. It has been established that hardening mechanism of aluminum is very well interconnected with changes in the microstructure observed after corresponding ECAP cycles. The hardening of materials before 5th pass of deformation occurs mainly due to the accumulation of deformation degree, and then processes of return and destruction develop.
aluminum , ECAP , mechanical properties , microhardness , мicrostructure
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