Microstructure evolution, texture and mechanical properties of hot rolled 4043 aluminum-silicon alloy under short-term annealing
Qian Cheng, Wenhao Yang, Shanju Zheng, Mingjun Peng, Wanzhang Yang, Mengchu Li, Mengnie Li, Mengnie Li, Mengnie Li
Abstract
This paper takes the 4043 Aluminum–Silicon Alloy as the research object and conducts hot rolling under different under-pressing quantities and inter-pass annealing conditions. The influence of inter-pass short-time annealing on the microstructure evolution (grain structure, dislocation density and texture) and mechanical properties of hot-rolled Al–Si alloy is studied. Microstructure characterization shows that after inter-pass short-time annealing, the material undergoes significant static recovery, resulting in more subgrain structure and recrystallization structure, accompanied by a decrease in dislocation density. Moreover, at a smaller deformation amount, Goss texture dominates. With the enhancement of shear effect during rolling, the dominant texture in α-fiber changes from Goss texture to P texture, and short-time annealing increases the proportion of Cube texture in the sample. Mechanical results show that compared with the hot-rolled sample (HR75), the sample annealed by short-time annealing and hot rolling (AHR75) only sacrifices 4 % of the tensile strength, but significantly increased the elongation by 153 %. The tensile strength is primarily attributed to a more dispersed dislocation distribution, higher dislocation density, and grain boundary strengthening mechanisms, while the high elongation is mainly due to the increase in Cube texture proportion.