THE ROLE OF B ELEMENT ON REFINING PURITY ALUMINUM

摘要

The effect of B element on the macrostructure and property of purity aluminum has been studied with Optical Microscopy and MTS. It is shown that although the single B element has little or none refining effect on the purity aluminum, it will obviously increase the refining effect and prolong the fading time when it was simultaneously added into the molten aluminum with Ti element. It is found from the analysis of SEM, SEM-EDAX and thermodynamics that the refining mechanism of salts containing Ti and B elements on the purity aluminum are mainly contributed to the heterogeneous nuclei of TiAl_3 particles reacted and dispersed in the melting. While the reacted (Al, Ti) B_2 particle plays little or none role in refining purity aluminum. However, the fine (Al, Ti) B_2 particle will reduce the size of TiAl_3 since the TiAl_3 nucleates and grows along the (Al, Ti) B_2 particle.