Abstract
The present study investigates the effect of shot peening (SP) on the mechanical properties and surface roughness of 7075 aluminum alloy during different stages and conditions of heat treatment. The mechanical properties were determined by measuring Vickers microhardness profiles and residual stress profiles, while the amount of alloying elements present in the solid solution of the samples under different heat treatment conditions was determined by measuring the electrical conductivity. The results show that the increase in microhardness near the SP surface and the maximum compressive residual stresses are mainly related to the content of alloying elements in the solid solution. Surface roughness increases with increasing SP Almen intensity, and samples with the highest microhardness and residual stresses have the lowest surface roughness.
Highlights
Aluminum alloy 7075 is widely used in automotive and aerospace industries due to its high strength and light weight [1]
The results show that the increase in microhardness near the shot peening (SP) surface and the maximum compressive residual stresses are mainly related to the content of alloying elements in the solid solution
The results show that the highest microhardness 50 μm below the surface of SP was found for the samples in quenched condition (Q) and the samples quenched and aged at 145 ◦C (Q-145), while the lowest was found for the samples quenched and aged at 195 ◦C (Q-195)
Summary
Aluminum alloy 7075 is widely used in automotive and aerospace industries due to its high strength and light weight [1]. This results in ultra-high specific strength, high fracture toughness and resistance to stress corrosion cracking [2] This aluminum alloy contains zinc, magnesium, and copper as alloying elements that mainly contribute to its excellent mechanical properties. Mhaede [11] investigated the effects of various process parameters of SP and ball burnishing on the surface layer properties, i.e., surface roughness, microhardness and compressive residual stresses, fatigue, and corrosion fatigue properties of 7075 aluminum alloy. Since the alloying elements in the solid solution of the 7075 alloy strongly affect the properties of the surface region after SP, we decided to evaluate the microhardness, residual stresses and roughness during all stages of the precipitation heat treatment process
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
