Generally,　Ti　in　solution　damages　the　electrical　conductivity　of　aluminum,　so　the　less　the　better.　However,　during　boron　treatment　process　trace　Ti　can　promote　the　precipitation　of　transition　metal　elements　in　forms　of　doped　borides,　thus　improving　the　electrical　conductivity　of　aluminum.　With　conventional　boron　treatment,　the　efficiency　is　77.7%　and　electrical　conductivity　of　AA1070Al　is　64.6%　IACS.　However,　with　Ti　assistant,　owing　to　the　compositional　evolution　of　borides,　the　efficiency　can　reach　93.3%　and　electrical　conductivity　of　AA1070Al　is　increased　to　65.3%　IACS,　which　is　much　higher　than　that　with　conventional　boron　treatment.　Based　on　this,　a　novel　composite　boron　treatment　technology　is　proposed　and　a　schematic　diagram　is　built　to　analyze　the　complex　reaction　mechanism　of　boron　treatment.　(C)　2017　Elsevier　B.V.　All　rights　reserved.