Study of Mechanical Properties of 7075 Aluminum Alloy Due to Particle Size Reduction due to Constrained Groove Pressing CGP Process
الموضوعات :
Shahin Heidari
1
(Bone and Joint Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran)
Ahmad Afsari
2
(Department of Mechanical Engineering, Shiraz Branch, Islamic Azad University, P. O. Box: 71348-14336, Shiraz, Iran)
الکلمات المفتاحية: Mechanical Properties, 7075 aluminum alloy, Constrained Groove Pressing Process, Ultrafine-grained Materials,
ملخص المقالة :
Today, one of the new approaches of researchers to produce materials with very fine grains is the application of severe plastic deformation on the prototype with coarse grains. In this method, the grain size is reduced to the nanometer scale in several stages through applying strong strains to the sample, which leads to the improvement of mechanical and physical properties in the material. One of the most important methods of applying severe plastic deformation is the constrained groove pressing (CGP) process. According to studies, little research has been done on the weight loss of structures used in the military, maritime, aviation, and medical industries. Therefore, the mechanical behavior of the sheets was experimentally studied by the CGP method. The results show that the structure of 7075-T6 aluminum particles decreased in size from 60 microns to 270 nanometers by increasing the steps of this process. Also, the yield strength in the fourth pass increased by 38% compared to the annealed sample, and the tensile strength improved by 34%. In addition, the percentage of longitudinal increases in the fourth pass is reduced to its lowest value, ie 40%.
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