Al-Mg-Zn-Mn alloy profile and preparation method thereof

The Al-Mg-Zn-Mn alloy profiles are produced with enhanced mechanical properties by forming primary phases and controlled heat treatment, extrusion, and aging, overcoming equipment constraints to meet the demands of long-span mechanical bridges.

CN119242967APending Publication Date: 2025-01-03ZHONGBEI UNIV +1
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Patent Information

Application Number
CN202411234880.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-04
Publication Date
2025-01-03

AI Technical Summary

Technical Problem

Existing methods struggle to produce large-size, high-strength, and tough aluminum alloy profiles required for long-span mechanical bridges due to limitations in manufacturing equipment, particularly for profiles exceeding 10 meters.

Method used

A method involving the preparation of Al-Mg-Zn-Mn alloy profiles through the formation of primary Al6Mn and T-Mg 32(AlZn) 49 phases, followed by heat treatment, extrusion, stretching, and double-stage aging, with specific chemical compositions and processing conditions to enhance mechanical properties.

Benefits of technology

The method enables the production of Al-Mg-Zn-Mn alloy profiles with yield strength ≥500 MPa, tensile strength ≥550 MPa, and elongation ≥12%, suitable for long-span mechanical bridges without the need for offline solution quenching, addressing the equipment limitations and improving mechanical properties.

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Abstract

The invention provides an Al-Mg-Zn-Mn alloy profile and a preparation method thereof, and relates to the technical field of aluminum alloy processing.The preparation method comprises the following steps that an Al-Mg-Zn-Mn alloy cast ingot is prepared, and the cast ingot contains a primary Al6Mn phase and a primary T-Mg32 (AlZn) 49 phase; performing soaking treatment on the cast ingot; cogging treatment is conducted on the cast ingot obtained after soaking treatment, then extrusion forming is conducted, so that a T-Mg32 (AlZn) 49 phase is redissolved into an aluminum matrix, online quenching is conducted, and an extruded profile is obtained; stretching and straightening the extruded profile; and aging treatment is conducted, specifically, aging treatment is conducted on the stretched and straightened profile, so that the T-Mg32 (AlZn) 49 phase is separated out, and the Al-Mg-Zn-Mn alloy profile is obtained. The content of Mn in the raw materials is increased, the mass percentage content ratio of Zn to Mg is controlled, the proportion of recrystallized grains is increased through high-temperature extrusion forming, and the supersaturation degree of a matrix is improved through online quenching; and after aging treatment, dispersed precipitation of a T phase is promoted, and the obdurability of the aluminum alloy profile is remarkably improved. According to the method, off-line solid solution quenching is not needed, and the Al-Mg-Zn-Mn alloy profile with the large size and the high toughness can be prepared.
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Citation Information

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