Microstructural Evolution and Mechanical Properties of Aluminum Alloy 7075-T651 Processed by Friction Stir Processing

摘要

Aluminum-based alloys are broadly utilized in the automobile and aerospace industry due to its lightweight, excellent electrical and thermal conductivity, good machinability, and superior resistance to corrosion. In this experimental study, several tests have been carried out for obtaining the overall mechanical properties before and after friction stir processing (FSP) through suitable processing parameters: tool speed, feed rate, and tool tilt angle with overlapping ratio. Some mechanical properties have been reduced while the ductility of the FS processed alloy has been improved caused by fine grain refinement in the stir zone. It is also clearly shown from the electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) results that the grain refinement of average grain size 4.5 μm has been obtained which is responsible for increasing the ductility and also various intermetallic particles were homogeneously distributed into the matrix.