A method of controlling the type and size distribution of precipitates that are precipitated in an aluminum-lithium alloy

Abstract

This invention belongs to the field of metallic materials technology, specifically relating to a method for controlling the type and size distribution of precipitated phases in aluminum-lithium alloys. The method includes cold-rolling pre-deformation treatment of annealed aluminum-lithium alloy sheets, solution treatment at 530°C for 1 hour to precipitate precipitate phase A, and solution treatment at 550°C for 2 hours to precipitate precipitate phase B. This method eliminates the need for artificial aging; it achieves control over the distribution of precipitated phases solely through solution treatment, which is an essential step before aging. The distribution of precipitated phases in aluminum-lithium alloy sheets treated according to this method shows significant differences, effectively controlling the type and size distribution of precipitated phases in the aluminum-lithium alloy. TEM analysis confirms the type and size of precipitated phases precipitated after treatment with this method on different aluminum-lithium alloy sheets.

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