A kind of aluminum lithium alloy product and processing method

Abstract

The invention discloses an aluminum-lithium alloy machining method. The method comprises the steps of: homogenization: an aluminum-lithium alloy cast ingot is homogenized, and a cooling mode of the homogenization adopts a forced quick cooling mode; low-temperature heating; heating deformation; forced quick cooling; and final heat treatment. The method adopts forced quick cooling as the cooling mode of the homogenization to stop an aluminum-lithium alloy from forming a thick needle-shaped Widmanstatten structure, so that the heating plasticity of the cast ingot at lower temperature is improved, and the quenching effect formed by the forced quick cooling in the homogenization process can be totally eliminated in preheating; the heating adopts low-temperature heating to reduce dynamic recrystallization degree; and the forced quick cooling is performed for a heated prototype product again to inhibit static recrystallization, so that the final product strength and toughness of the aluminum-lithium alloy is improved. The invention further discloses an aluminum-lithium alloy product.

Description

technical field [0001] The invention relates to the technical field of metallurgical industry, in particular to an aluminum-lithium alloy product and a processing method. Background technique [0002] Aluminum and aluminum alloy products abound in our daily life, but aluminum and its alloys generally have good plasticity and are easy to plastically process. The phase composition of hard aluminum is relatively complex, and there are brittle structures such as low melting phase and intermetallic compounds. Its plastic processing has some characteristics: such as homogenization treatment to eliminate internal stress and intragranular segregation generated when the ingot is cooled; The surface should be milled to remove the surface segregation produced by the low melting phase. Some aluminum alloys are also clad to improve corrosion resistance and processing performance. Aluminum alloys are sensitive to overheating and overburning, and the heating temperature must be strictly ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the addition of Li and other elements that reduce stacking fault energy, aluminum-lithium alloys are more prone to various recrystallizations (dynamic recrystallization, sub-dynamic recrystallization, and static recrystallization) than conventional aluminum alloys during hot deformation processing. The strength and toughness of Al-Li alloys decrease with the increase of

At present, it is mainly to add trace elements, or to control the dispersed phase during homogenization, but to improve the thermal processing process itself less, resulting in low strength and toughness of the final product of aluminum-lithium alloy

[0005] In summary, how to solve the problem of low strength and toughness of the final product of aluminum-lithium alloy has become a technical problem to be solved urgently by those skilled in the art

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