Synergistic effects of Mn and B on iron-rich intermetallic modification of recycled Al alloy

• DOI: 10.1016/j.jmrt.2023.03.045
• Publication Date: 2023-03-09T17:28:01Z
• Authors: Dongfu Song; Yuliang Zhao; Yiwang Jia; Xintao Li; Yanan Fu; Weiwen Zhang
• Keywords: Morphology; Surface Modification

Individual manganese (Mn) modification cannot prevent the formation of coarse and blocky Iron-rich phases in recycled Al–Si alloys. In present work, scanning/transmission electron microscopy (SEM/TEM), thermodynamic calculations, synchrotron X-ray imaging were comprehensively applied to reveal synergistic effect Mn B (boron) on phase Al–Si–Fe alloys during solidification. The results showed that with addition B, morphology translated from primary into a uniform hollow-shaped multibranched Chinese-script morphology. An appropriate boron amount significantly reduced initial nucleation temperature increased number cites. TEM show there was no obvious orientations relationship between AlB2 α-Al15(MnFe)3Si2 phases. main mechanism is adsorbed oxide film surface, which hindered at high temperature. This + compound method provides an alternative way enhance mechanical properties industry.