Microstructural Evolution of a 3003 Based Aluminium Alloy during the CSET Process

A new severe plastic deformation technique, known as the complex shearing of extruded tube (CSET), was applied to a 3003 based model aluminium alloy. This technique, consisting of a combination of extrusion and two consecutive Equal Chanel Angular Pressing (ECAP) passes accompanied with concurrent torsional straining, is capable to produce a fine-grained tubular sample directly from a bulk metallic cylinder in one forming operation. In the present paper, the microstructural development of the alloy during partial processes of CSET was studied in detail using light microscopy, electron backscatter diffraction, and transmission electron microscopy. It was found that CSET technique refines the grain size down to 0.4 µm and, consequently, increases the microhardness from the initial value of 40 HV to the final value of 120 HV. The contributions of partial processes of CSET to the total strain were estimated.

Влияние ультрамелкозернистой структуры материала на прочностные характеристики сплава алюминия при ударных нагрузках

Contemporary automotive and aerospace industry have high requirements for the reliability due to growth of the vehicle velocities. At the same time, performance of materials used for the vehicle production often operate under non-standard conditions. The paper presents a comprehensive approach to study and prediction of the behavior of materials subjected to dynamic tensile loads. Aluminum alloys Al-Mg и Al-Cu-Mg are studied in order to demonstrate possibility of the strength properties enchantment using severe plastic deformation technique. Behavior of the materials us investigated for a wide range of loading conditions.