2000 series aluminum alloy belongs to Al Cu mg series heat treatable strengthened aluminum alloy. It has high strength and good heat resistance. It is widely used in aerospace materials. In recent years, researchers at home and abroad have added some rare earth elements on the basis of 201422192519 and other alloys to change the aging behavior of the alloy, so as to obtain the best high-temperature properties and comprehensiveness.
2618 aluminum round bar usually needs hot rolling and forging, and the forming temperature has a great influence on the microstructure and mechanical properties of aluminum alloy. In order to obtain good comprehensive mechanical properties, solution treatment and subsequent aging treatment are very necessary. Mechanical properties such as strength and toughness are the important basis for the selection of most structural materials. However, the two generally change one another, and few materials have both high strength and good toughness. Ultrafine grained bulk materials generally have high strength but low toughness. The low toughness is mainly due to the insufficient dislocation accumulation in the material, which reduces the strain strengthening effect. Ultra fine grained materials are greatly limited by low ductility
Therefore, many researchers are committed to studying the methods to improve the comprehensive mechanical properties of ultrafine grained materials. Early improvement wood
In recent years, through large deformation of precipitation strengthened aluminum alloy, it is hoped to improve the strength and toughness of the alloy at the same time. For example, ECAP (equal diameter angular extrusion) is applied to prepare high strength and high toughness aluminum alloy.
2618 heat-resistant aluminum alloy is an Al Cu Mg alloy which introduces intermetallic phase al9feni phase by adding an appropriate amount of Fe and Ni elements, in order to improve the microstructure and mechanical properties of the alloy. Chalco aluminum has developed a new thermomechanical treatment process of "solid solution treatment + ECAP + short-time recrystallization + peak aging treatment" for
2618 aluminum round bar, in order to obtain 2618 aluminum alloy with very fine grain structure and make the alloy have better comprehensive aeromechanical properties.
(1) fine recrystallized grain structure can be obtained by recrystallization annealing of
2618 alloy after ECAP deformation. The best recrystallization annealing process parameters are: holding at 530 ℃ for 5 ~ 30min.
(2) the grain structure of 2618 alloy after aging is not sensitive to the recrystallization annealing time. The recrystallization annealing of 2618 alloy after ECAP deformation for 5 ~ 15min can meet the requirements, and the average grain size of the alloy can be controlled at 25 μ M or so.
(3) the comprehensive mechanical properties of
2618 aluminum alloy can be improved by solid solution + ECAP + short-time recrystallization annealing + peak aging treatment, which is a beneficial exploration of thermomechanical treatment process to improve the comprehensive mechanical properties of aluminum alloy.
