ADC12　aluminum　alloy　has　been　widely　used　in　the　aerospace,　ship,　and　automotive　fields　because　of　its　high　specific　strength,　excellent　die-casting　performance,　and　wear　resistance.　Adhesion　wear　is　the　main　wear　mechanism　of　high-speed　milling　ADC12　aluminum　alloy.　The　most　important　factor　affecting　adhesion　wear　is　the　tool–chip　interface　friction,　which　is　directly　manifested　in　the　tool–chip　interface　temperature.　Therefore,　the　temperature　variation　during　the　milling　of　aluminum　alloy　is　analyzed　using　a　temperature　field　model　and　infrared　temperature　measurement　technology.　Then,　the　tool　wear　morphology　and　the　tool　wear　land　width　are　observed　using　a　scanning　electron　microscope.　Finally,　the　tool　wear　mechanism　considering　the　tool–chip　interface　temperature　is　discussed.　The　tool–chip　interface　temperature　is　related　to　the　friction　angle,　tool–chip　contact　length,　and　friction　force　at　the　rake　face,　which　increases　first　and　then　decreases　as　the　cutting　speed　and　feed　rate　increase.　During　the　formation　of　the　adhesive　layer,　the　tool–chip　interface　temperature　increases,　the　change　rate　of　the　cutting　force　and　the　tool　wear　rate　increase,　and　adhesion,　oxidation,　and　abrasive　and　delamination　wear　are　generated　on　the　tool　surface.　With　the　increase　in　temperature,　the　tool　wear　rate　increases,　the　molten　adhesive　layer　on　the　tool　surface　is　accompanied　by　crack　propagation,　and　adhesion　wear,　oxidation　wear,　and　abrasive　wear　occur　on　the　tool　surface.　©　2023　by　the　authors.