چكيده به لاتين
There has always been a need for materials with very high mechanical properties in different industries. The choice of a material in engineering structures should be proportional to the type of operation and the position of application of that material. Accumulative Roll Bonding process is a new, low-cost, and applied method for obtaining fine-grained materials along with improvements in mechanical properties. The main goal of this study was to determine the formability of the metal sheets produced by the ARB at high temperature and study of the effect of ARB process temperature on the mechanical properties and formability of the aluminum AA1050. Therefore, ARB was carried out at ambient temperature, 100, 200 and 300 ℃ to fifth cycle without lubrication. After production samples, mechanical properties, fracture surface and formability were studied by draw up the forming limit diagrams experimentally and using the Nakazima test. According to the results, At all temperatures, by increasing the number of process cycles, tensile strength and hardness increases. Also, at the end of the first pass, the amount of elongation and surface under the FLD is sharply reduced, but in subsequent passes, it will increase at low rates. Tensile strength also increases at a lower rate than the first cycle. At ambient temperature, the best mechanical properties after the fifth cycle were obtained, which tensile strength and elongation were recorded as 210.1MPa and 14.2%, respectively. By increasing temperature, the tensile strength and micro hardness of the samples were slightly lower than the ambient temperature, however, elongation and consequently, formability of the samples has been improved. At 100 °C, no significant changes were observed in the mechanical properties and the formability of samples compared to the ambient temperature. While the highest change was at 300 ° C which elongation and FLD0 relative to ambient temperature increased by about 38.1% and 87%, respectively that means increasing the samples formability with increasing temperature.
