A preparation method of homogeneous fine-grained al-mg-si alloy mirror material

Abstract

The invention discloses a method for preparing a homogeneous fine-grained Al-Mg-Si alloy mirror material: the homogenized Al-Mg-Si alloy ingot is heated to 500-540°C with the furnace, and a multi-directional upsetting process is adopted. The homogeneous billet is prepared; the homogeneous billet is subjected to high-temperature solution treatment; the billet after the high-temperature solution treatment is processed into a cuboid structure, soaked in liquid nitrogen to cool down to the liquid nitrogen temperature, and then multi-directionally compressed; finally heat-treated , to complete the preparation of homogeneous fine-grained Al-Mg-Si superalloy mirror material. The process method proposed by the present invention can make the coarse second phase in the Al-Mg-Si alloy ingot refined and uniformly dispersed, and at the same time obtain a uniform, fine and equiaxed recrystallization structure, which can improve the Al-Mg-Si The mirror processing performance of the alloy provides high-quality aluminum alloy materials for reflectors, and meets the urgent needs of domestic high-quality aluminum alloy mirror materials in the field of national defense.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular relates to a method for preparing an ultrafine-grained, homogeneous Al-Mg-Si alloy mirror material. Background technique [0002] Reflectors are key components of lidar systems, space-based reconnaissance and surveillance systems, and astronomical telescopes. With the development of space technology, reflectors have put forward higher requirements for reflectivity, lightweight, and large-scale. Aluminum alloy is a common material for mirrors, because: ① aluminum alloys have very high reflectivity in a wide wavelength range from infrared to ultraviolet light, and can realize multi-spectral imaging; ② mirrors and mounting support structures can use the same An aluminum alloy material is used to avoid mirror distortion caused by inconsistent material expansion coefficients and ensure the imaging quality of the optical system; ③ aluminum alloy has the chara...

AI Technical Summary

Problems solved by technology

Although the conventional low temperature large deformation process can refine the grain structure of some Al-Mg-Si alloys, the internal residual stress of the material is too large to meet the requirements of the mirror alloy.

In order to prepare high-quality aluminum alloy reflector materials, foreign Newswander et al. proposed to use the "ingot solidification forming + hot isostatic pressing" process to prepare reflector aluminum materials, and to realize mirror blank forming through subsequent forging / extrusion processes, but this process There are limitations such as complex process and easy formation of oxide film

[0005] However, there is no report on the preparation technology of Al-Mg-Si alloy mirror materials in China, and the aluminum materials for high-quality mirrors mainly rely on imports, and related technologies need to be broken through

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