2017•DEStech Transactions on Materials Science and EngineeringRequires access
Effects of La and Mg on Microstructure and Mechanical Property of Al‐15Si Alloy
Weiheng Chen, Libo Zhang, Jinhui Peng, Shaohua Yin, Shiwei Li, Feng Xie, Yue Zhao, Yuanrui Huang
Open publisher page 0 citations
Abstract
The effects of La on the microstructures and mechanical properties of Al‐15Si alloy were investigated, and the results showed that 0.3% La could availably modify the Al‐15Si alloy. The morphology of the eutectic Si obviously changed into the short flake and the dot shape, and the angle of primary Si was refined to bluntness with the contents of La increasing from 0.1 % to 0.3%. In addition, the effects of Mg on the microstructures and mechanical properties Al‐15Si‐0.3La alloy were studied. The optical micrographs showed that the eutectic Si were further refined to the shorter bar the dot shape, and the amount of primary Si reduced with the increase of Mg addition. The formation of Mg2Si strengthening phase improved the mechanical properties of the modified Al‐15Si‐0.3La alloy. Compared with Al‐15Si alloy, the tensile strength and the elongation of Al‐15Si‐0.3La‐2.0Mg alloy increased 41.4% and 40%, respectively.