Microstructure and Texture of an Aluminum Plate Produced by Multipass Cold Rolling and Graded Annealing Process

Yunlei Wang,Yu Cao,Fangzhou Yang,Guangjie Huang,Liping Ren,Qi Liu

doi:10.3390/met12020260

Abstract

In order to explore the microstructure, texture, individual performance, and grain size characteristic evolution law during the process of multipass cold rolling, graded annealing process, the experimental design, research approach, and methodology were investigated using the equipment of optical microscope (OM), X-ray diffraction (XRD), electron backscattered diffraction (EBSD), and transmission electron microscope (TEM). The results show that a low interannealing temperature could strengthen the cubic texture after finished product annealing, and a high volume fraction of cubic texture components was subsequently obtained. In view of the nucleation advantage of cubic texture, the Cube-{001}<100> texture formation after annealing was promoted by the cold-rolled texture of Cu-{112}<111> and S-{123}<634>, which mainly depended on the decomposition of Cu and S textures, finally, they were consumed and transformed from Cu and S textures into a cubic texture. In addition, the dislocation configuration and corrosion pit density were clearly visible and distinctive in the observation space of aluminum foil.

Highlights

The microstructure and texture of aluminum and its alloys are closely related to mechanical properties and macro performance during cold rolling, heat treatment, and other processing procedures [1]
This kind of aluminum electrolytic capacitor has the advantages of large capacitance, high working voltage, and low price [4,5,6]; especially in recent years, the performance of aluminum foil has been improved to a certain extent, and the application has been gradually expanded in many areas
These researchers have completed a lot of research, for the actual production of enterprises, the production efficiency is not high, the resulting cubic texture content is not uniform, and this conventional treatment does not save lead times; it is difficult to ensure the preparation of a high-quality capacitor aluminum foil [12,13,14,15,16,17,18]

Summary

Introduction

The microstructure and texture of aluminum and its alloys are closely related to mechanical properties and macro performance during cold rolling, heat treatment, and other processing procedures [1]. The effects of cold-rolled deformation degree and passes [15,16], the volume fraction of texture, interannealing [17], finished product annealing [18], and the impurity elements [19,20] on microstructure, grain boundary character, and recrystallization behavior, which was discussed within a lot of research works [15,16,17,18,19,20,21,22,23] These researchers have completed a lot of research, for the actual production of enterprises, the production efficiency is not high, the resulting cubic texture content is not uniform, and this conventional treatment does not save lead times; it is difficult to ensure the preparation of a high-quality capacitor aluminum foil [12,13,14,15,16,17,18]. The effects of different preparation technology (including primary cold-rolled deformation degree and passes, primary interannealing, secondary cold-rolled deformation, secondary interannealing, finished product annealing, and final annealing) on the microstructure, dislocation configuration, micro-zone grain orientation, and cubic texture content in aluminum foil were investigated; the nucleation mechanism, recrystallization behavior and texture evolution of cube orientated grains were deeply discussed

Material

Experimental Program

Results and Discussion

Microstructure and Misorientation Angle Distribution