Abstract
The mechanical properties such as hardness and ultimate tensile strength of metals depend on the grain size, which have to be properly controlled and optimized to ensure the better economy and desirable mechanical characteristics of the metals. In order to study the microstructure evolution of AA1070, many experimental tests were conducted at different cold working and annealing conditions. Utilizing the experimental results, the static recrystallization and grain growth behavior of AA1070 have been investigated and the developed equations that can be used to the FEM of the annealing process have been obtained. The agreement between numerical modeling and experimental results is reasonably good for this material. The results showed that the recrystallization and grain growth behavior of AA1070 was evidently affected by both the annealing temperature and plastic strain.
Highlights
The advantages of pure aluminum make it appropriate for intricate forming processes by virtue of its high ductility and the ideal ratio of Young’s modulus to mass density especially as the grain size is reduced [1].Many important mechanical properties of materials, including yield strength, hardness and toughness can be improved by refining the grain size
When a new grain is nucleated during processing, the atoms within each growing grain, are lined up in a specific pattern that depends upon the crystal structure of the metal or alloy
The investigations show that annealing temperatures under 320 ̊C do not have sensible holding time for recrystallization; theses temperatures cannot be a proper recrystallization temperature for this material
Summary
The advantages of pure aluminum make it appropriate for intricate forming processes by virtue of its high ductility and the ideal ratio of Young’s modulus to mass density especially as the grain size is reduced [1]. On annealing a cold deformed metal at an elevated temperature, the microstructure and the mechanical properties may be partially or completely restored by recovery (in which rearrangement of the dislocations occurs) or recrystallization (in which new dislocation-free grains are formed within the deformed material) respectively. They considered a number of aspects of the structural simulation as well as that of extrusion as a thermomechanical process In this investigation, the static recrystallization and grain growth behavior of cold-worked commercial purity aluminium has been studied by using experimental and numerical results at various isothermal annealing conditions. The main attention of this paper is concentrated on development of recrystallization and grain growth equations and predicting and controlling the material microstructural behavior especially grain size at different processing conditions
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