Method for inhibiting abnormal growth of weld grains of aluminum-lithium alloy extruded profile and profile

The invention provides a method for inhibiting abnormal growth of weld grains of an aluminum-lithium alloy extruded profile and the profile, and belongs to the technical field of strengthening and toughening of split-flow extruded profiles of aluminum-copper-lithium alloys. The method comprises the following steps: step 1, homogenizing an as-cast aluminum-lithium alloy blank, then carrying out isothermal split-flow extrusion to obtain an aluminum-lithium alloy extruded profile, extruding the aluminum-lithium alloy extruded profile out of a mold, and then carrying out water quenching treatment; 2, the aluminum-lithium alloy extrusion profile subjected to water quenching treatment in the step 1 is subjected to cold rolling at the room temperature in the extrusion direction; and 3, standard T6 treatment is conducted on the aluminum-lithium alloy extruded profile subjected to cold rolling in the step 2, wherein the standard T6 treatment comprises solution treatment and aging treatment. The aluminum-lithium alloy