Effects of Trace Amount Modified SiC Nanoparticles and Electromagnetic Stirring(EMS)on Microstructure and Mechanical Properties of 7055 Aluminum Alloy

摘要

The effects of trace amount modified SiC nanoparticles and electromagnetic stirring(EMS)on microstructures and mechanical properties of 7055 aluminum alloy are investigated experimntally.The result shows that the original developed coarse dendrite and columnar with obvious orientation microstructure turns into homogeneous equiaxed microstructure with the application of trace amount modified SiC nanoparticles and EMS.A minimum grain size is 96 μm and has been observed when the addition of modified SiC nanoparticles is 0.05％and the current of EMS is 100A.The ultimate tensile strength is increased by 15.8％and the elongation is improved by 50％compared to those without modified SiC nanoparticles and EMS.Moreover,the compound effects of trace amount modified SiC nanoparticles and EMS is discussed to explain the mechanisms of grain refinement and mechanical properties on 7055 aluminum alloy.