Effects of Gradient Hot Rolled Deformation on Texture Evolution and Properties of 1561 Aluminum Alloy

Abstract

Through gradient hot rolling, a transition zone from the initial undeformed to 30% deformed microstructure was obtained in the 6 mm thick 1561 aluminum alloy hot rolled plate. The effect of gradient deformation on the evolution process of structure and texture characteristics to 1561 aluminum alloy were systematically investigated by X-ray diffractometer (XRD), optical microscope (OM), and electron back-scattered diffraction (EBSD) in this paper. The results showed that after gradient hot rolling, the grains were elongated along the rolled direction, and the average grain size decreased from 18.95 μm to 1.19 μm. After annealing, the average grain size decreased from 28.34 μm to 10.69 μm. The fraction of dynamic recrystallization is low in all cases. With the increase in gradient deformation, the fraction of the deformed texture (110) <100> Goss, (110) <112 > Brass and fiber texture increased under the action of shear strain, the hardness value of annealed 1561 aluminum alloy ranged from 83.8 HV up to as high as 104 HV, and the electrical conductivity (EC) value increased from 23.5% IACS to 24.3% IACS. Significantly, with the increment of the deformation, the dislocation density increases 2.4 × 1013 m−2 of the annealed hot rolled plates, which should be responsible for the hardness increase. While the structure of the alloy becomes more orderly, the EC increases. Work hardening, fine-grain strengthening and texture all influence the mechanical properties of the gradient hot rolled 1561 aluminum alloy plate.

Evolution of Microstructures, Texture and Mechanical Properties of Al-Mg-Si-Cu Alloy under Different Welding Speeds during Friction Stir Welding

“…Figure 7 shows the ODF diagram of the parent material, and it can be determined from the literature [26][27][28] that the textures present in the BM in the figure are the C ({001}<100>) recrystallised cubic texture and P({110}<112>) recrystallised texture, Goss (G) texture, brass (B) texture and {112}<110> rotating copper texture. The grain orientation during the rolling of aluminium alloys is mainly concentrated on the β-orientation line and α-orientation line, with a small amount of cube texture [29]. The α-fibre texture starts from the Goss orientation {110}<001>, passes through the brass orientation {110}<112> and, finally, reaches the rotating Goss orientation {110}<110>, while the β-fibre texture starts from the copper orientation {112}<111>, passes through the S orientation {123}<634> and, finally, reaches the brass orientation {110}<110>.…”

“…During the subsequent growth, grains with precise cubic orientation account for the upper fraction, forming the cube texture [30,34,35], and the formation of rotating copper textures may be related to the shear forces on the material. with a small amount of cube texture [29]. The α-fibre texture starts from the Goss orientation {110}<001>, passes through the brass orientation {110}<112> and, finally, reaches the rotating Goss orientation {110}<110>, while the β-fibre texture starts from the copper orientation {112}<111>, passes through the S orientation {123}<634> and, finally, reaches the brass orientation {110}<110>.…”