Structure and mechanical properties of aluminum alloys AMC and AMG6 after plastic deformation

Abstract

The article is devoted to the improvement of the ECAE method with reference to aluminum alloys and the study of the effect of plastic deformation on the structure and mechanical properties of aluminum alloys AMC and AMG6. On the basis of experimental studies, the optimal method and modes of ECAE of aluminum alloys AMG6 and AMC were studied, which allow to obtain a billet with increased mechanical characteristics. The most intensive grinding of the grain structure in aluminum alloys AMC and AMG6 occurs with ECAE 12 passes, with the intersection of the channel angle by 1200. After ECAE -12 in aluminum alloys, the grain of the initial material is ground to a size of ~ 1.0–1.5 μm. With ECAE with an intersection angle of 120°, at which the number of processing cycles reached 12 at e=8.4, it became possible to obtain defectfree preforms with a more homogeneous structure. As a result of equal channel angular pressing, the microhardness of the AMG6 alloy increases almost 4-fold, compared with the initial state; The microhardness of the AMC alloy increases, which is almost 4.5 times higher than in the initial state. After ECAE-12, the mass loss is reduced to 5.4–5.6 mg, which shows an increase in wear resistance of aluminum alloys AMG6 and AMC by 13–14%. After ECAE -12, the AMC alloy increases its tensile strength from 91 MPa to 297 MPa, and the yield strength is from 75 MPa to 297 MPa. After ECAE -12, AMG6 alloy increases its tensile strength from 359 MPa to 565 MPa, and the yield strength is from 279 MPa to 565 MPa. The value of elongation before fracture of samples of AMC and AMG6 alloys decreases to 40 % and 20 %, respectively.