A kind of high-strength corrosion-resistant al-mg-sc-zr alloy and its preparation method
An alloy and corrosion-resistant technology, applied in the field of non-ferrous metal material preparation, can solve problems such as poor plasticity
Active Publication Date: 2021-05-11
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology
The strength of the cold extruded pure aluminum rod can reach 300Mpa, but its plasticity is poor, and the patented method uses anodic coating process to improve the corrosion resistance of aluminum, which will produce harmful substances to the environment
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[0021] High-strength and corrosion-resistant Al-Mg-Sc-Zr alloy is made by the following steps:
[0022] 1. Casting. The composition of the configuration alloy is 4% Mg, 0.1% Zr, 0.2% Sc, wherein Zr and Sc are added through the master alloy. After the pure aluminum and these alloy elements are smelted together, a round rod-shaped ingot with a diameter of 30 mm is cast by horizontal continuous casting. During the casting process, when the ingot temperature is lower than 580 ° C, it is necessary to ensure that it enters high-pressure secondary cooling Strong water cooling to prevent the precipitation of two trace elements during casting cooling.
[0023] 2. Primary high temperature annealing. The ingot was annealed at 500°C for 1 h to eliminate dendrite segregation in the ingot, improve the hot processing processability of the ingot, and at the same time make the Zr element in the ingot form Al3Zr phase to disperse and precipitate, and most of the Sc elements were still in the ...
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Abstract
The invention discloses a high-strength and corrosion-resistant Al-Mg-Sc-Zr alloy, comprising the following components by weight: Mg 3.5-4%, Sc 0.05-0.2%, Zr 0.05-0.2%, and the balance is Al; A preparation method of the alloy is also disclosed, including five steps of casting, primary high temperature annealing, hot forging, finishing, and secondary stress relief annealing. The invention adopts Al-Mg alloy with good corrosion resistance, and adding Zr and Sc elements that will not reduce the corrosion resistance of the alloy in the alloy can not only play a certain role in precipitation strengthening, but also will not form an electrode potential higher than that of the matrix. low precipitation phase, in addition, Al 3 Zr and Al 3 Both Sc have the effect of inhibiting the recovery and recrystallization of the alloy; the invention ensures the corrosion resistance and hot working performance of the alloy through the design of the alloy composition, and ensures that the alloy has the required strength and plasticity through the coupling design of the double-stage annealing and hot forging process, The obtained alloy has simple composition, strong operability of the preparation process and broad market prospect.
Description
technical field [0001] The invention belongs to the field of preparation of nonferrous metal materials, and in particular relates to a high-strength corrosion-resistant Al-Mg-Sc-Zr alloy and a preparation method thereof. Background technique [0002] In recent years, a new demand has been put forward in the field of air-conditioning and cold storage refrigeration equipment manufacturing to replace some copper valves with aluminum valves to reduce costs and improve the corrosion resistance of the valves. To achieve this substitution, the aluminum alloy used needs to meet two requirements: (1) the tensile strength of the aluminum alloy is above 400MPa, and the elongation is above 20%, so as to be equivalent to the performance of the copper alloy originally used; (2) the aluminum alloy The alloy has good hot workability and corrosion resistance, which is beneficial to the manufacture and use of valves. Among the commonly used aluminum alloys, those whose strength can reach 400...
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IPC IPC(8): C22C21/06C22F1/047B23P15/00
CPCB23P15/00C22C21/06C22F1/047
Inventor 魏海根夏福中
Owner JIANGXI UNIV OF SCI & TECH