Forming limit diagrams of fine-grained Al 5083 produced by equal channel angular rolling process

Abstract

The objective of this research is to study the strain forming limits of Al-Mg alloy (5083) sheet, fabricated by equal channel angular rolling process at room temperature. For this purpose, the equal channel angular rolling process was executed at room temperature in three passes. Mechanical properties, microhardness, and microstructure were investigated after the equal channel angular rolling process. Uniaxial tensile tests of the equal channel angular rolling process produced samples and showed that yield and ultimate stresses increase, while the uniform elongation to fracture decreases in comparison with the annealed state. There was a continuous hardness enhancement by increasing the number of the equal channel angular rolling passes. After the third pass, the amount of hardness raised by 73% in comparison with the annealed sample. In the fourth pass, the hardness reduced slightly, that was attributed to the strain saturation in room temperature and was followed by high surface cracks. In the annealed condition, the average grain size was 45 mm, and after the third equal channel angular rolling pass, this amount was reduced to 10 mm. Furthermore, the forming limit diagrams were determined experimentally, using the Nakazima test. The obtained results show that after the third pass, the forming limit diagrams' level move downward, meaning that a reduction occurred in the forming limits of equal channel angular rolled samples.

Experimental evaluation of the plane stress fracture toughness for ultra-fine grained aluminum specimens prepared by accumulative roll bonding process

“…In the last decade, aluminum as a desirable material has absorbed interest of many researchers for various applications such as industries, automobile manufacturing and aerospace [1][2][3][4]. In other hands during these years, bulk nano and ultrafine-grained (UFG) materials have attracted significant research interest, because it reveals high strength besides good ductility and toughness, desirable corrosion resistance and high-speed superplastic deformation [5][6][7][8].…”

“…This process can be performed for a wide range of metals. In recent years the accumulative roll bonding process has been broadly utilized for fabrication in form of sheets and foils and for various materials such as pure aluminum [6,[24][25][26], aluminum alloys [4,10,23,27], Zr [28], Cu [29][30][31], Brass [32], Ti [33,34], Mg [35,36], and IF steel sheets [37][38][39]. The conclusions of the all of these works mainly proved that the ARB process is also able in manufacturing of the multilayered from same or different materials [40][41][42] and composites with metal matrix [5,[43][44][45][46][47] with desirable and improved mechanical properties, microstructure and also conclusions of some studies demonstrated that the mechanical properties such as tensile strength and microhardness can be increased more than two and even more than three times from the amounts of primary material before ARB process, but the elongation decreased.…”

Formability of the 5754-Aluminum Alloy Deformed by a Modified Repetitive Corrugation and Straightening Process

“…The AA5xxx series combine their strain hardening capacity with corrosion resistance, and acceptable forming capacity [1,2]. The effect of cold working in AA5xxx sheets have been widely studied [3,4]. The effect of plastic deformation methods-such as equal-channel angular pressing (ECAP), accumulative roll bonding (ARB), high pressure torsion (HPT), and constrained groove pressing (CGP), among others-have been reported for aluminum sheets [5][6][7][8].…”

The effect of temperature on the mechanical properties and forming limit diagram of Al 5083 produced by equal channel angular rolling

“…The severe plastic deformation (SPD) process has been considered as one of the methods for producing materials with nanometer grain size [3,4]. The equal channel angular rolling (ECAR) process is one of the methods of SPD [5]. ECAR is based on equal channel angular pressing (ECAP), which is carried out on large, thin sheets.…”