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Aluminum alloy subjected to composite microalloying of Sc and Zr and preparation method thereof

A technology of microalloying and aluminum alloy, applied in Zr composite microalloying aluminum alloy and preparation, microalloying aluminum alloy and preparation, using Sc field, can solve the problem that tensile strength and yield strength are not particularly obvious, strengthening effect It can improve the recrystallization temperature and thermal stability, increase the fatigue strength and fatigue life, and improve the comprehensive mechanical properties.

Inactive Publication Date: 2015-05-27
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of Sc added should not be too large. When the Sc content is greater than 0.6%, its strengthening effect will be weakened; and the higher the Sc content in the aluminum alloy, the more unstable the supersaturated solid solution will be in the subsequent heating process, and the decomposition rate will be lower. The faster, the decomposition product secondary Al 3 The aggregation tendency and aggregation speed of Sc particles will also increase, so that the strengthening effect of Sc will be lost
In addition, the high price of scandium restricts its addition
Adding Zr alone to the Al-Mg-Mn alloy has a certain fine-grain strengthening effect, but the improvement of mechanical properties such as tensile strength and yield strength is not particularly obvious, and the Al precipitated in the alloy 3 Zr particles are easy to coarsen during thermal processing, which greatly reduces the mechanical properties

Method used

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  • Aluminum alloy subjected to composite microalloying of Sc and Zr and preparation method thereof
  • Aluminum alloy subjected to composite microalloying of Sc and Zr and preparation method thereof
  • Aluminum alloy subjected to composite microalloying of Sc and Zr and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Al-8.5% Mn master alloy accounting for 5% of the total weight of the alloy, 11.8% Al-2.2% Sc master alloy, 2.3% Al-4.5% Zr master alloy, 6.1% pure Mg, and the balance is pure Al. Smelting by ingot metallurgy, KCl as covering agent, C 6 Cl 6 As a degasser, it is melted into an alloy ingot with the composition of Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr (alloy C) in a crucible resistance furnace. The ingot is homogenized at 460°C-470°C for 24 hours, then cut and milled, and then hot-rolled at 420°C-430°C for 3 hours to form a 6mm thick plate. The hot-rolled plate is cold-rolled after intermediate annealing into 2mm thick plates. After the cold-rolled sheet was stabilized and annealed at 350°C for 1 hour, its mechanical properties at room temperature were measured. The results are shown in Table 1.

[0035]Smelting and rolling Al-5.8Mg-0.4Mn (alloy A) and Al-5.8Mg-0.4Mn-0.25Sc (alloy B) by the same preparation method, annealing at 350 ° C for 1 hour, and then measuring their room te...

Embodiment 2

[0037] Using Al-8.5%Mn master alloy accounting for 5% of the total weight of the alloy, 9.4% Al-2.2%Sc master alloy, 4.6% Al-4.5%Zr master alloy, 6.4% pure Mg, and the balance is pure Al. Smelting by ingot metallurgy, KCl as covering agent, C 6 Cl 6 As a degasser, it is melted in a crucible resistance furnace to form an alloy ingot with a composition of Al-6Mg-0.4Mn-0.2Sc-0.2Zr (alloy D). The ingot is homogenized at 460°C-470°C for 24 hours, then cut and milled, and then hot-rolled at 420°C-430°C for 3 hours to form a 6mm thick plate. The hot-rolled plate is cold-rolled after intermediate annealing into 2mm thick plates. After the cold-rolled sheet was stabilized and annealed at 350°C for 1 hour, its mechanical properties at room temperature were measured. The results are shown in Table 1 for Alloy D.

Embodiment 3

[0039] Using 5% Al-8.5%Mn master alloy, 7% Al-2.2%Sc master alloy, 5.8% Al-4.5%Zr master alloy, 6.1% pure Mg, and the balance is pure Al, accounting for 5% of the total weight of the alloy. Smelting by ingot metallurgy, KCl as covering agent, C 6 Cl 6 As a degasser, it is melted into an alloy ingot with the composition of Al-5.8Mg-0.4Mn-0.15Sc-0.25Zr (alloy E) in a crucible resistance furnace. The ingot is homogenized at 460°C-470°C for 24 hours, then cut and milled, and then hot-rolled at 420°C-430°C for 3 hours to form a 6mm thick plate. The hot-rolled plate is cold-rolled after intermediate annealing into 2mm thick plates. After the cold-rolled sheet was stabilized and annealed at 350°C / h, its mechanical properties at room temperature were measured. The results are shown in Table 1 for Alloy E.

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Abstract

The invention discloses an aluminum alloy subjected to composite microalloying by using Sc and Zr. The alloy matrix refers to an Al-Mg-Mn alloy, wherein the alloy comprises the following components in percentage by mass: 4-6.2 percent of Mg, 0.2-0.6 percent of Mn, 0.2-0.4 percent of Sc, 0.05-0.4 percent of Zr and the balance of Al. The trace Sc and Zr are compounded in the Al-Mg-Mn alloy, so that the comprehensive mechanical properties and the thermal stability can be greatly improved. Compared with an Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr alloy subjected to composition optimization, the alloy in the invention has the advantages that the tensile strength sigma b is improved by nearly 100MPa, the yield strength sigma 0.2 is improved by 40-50 percent, and the alloy has high ductility. The effect of the composite addition of Sc and Zr on the Al-Mg-Mn alloy mainly refers to forming Al3(Sc1-xZrx) second-phase particles in the alloy of Sc and Zr, the primary Al3(Sc1-xZrx) particles have the effects of refining cast grains, and secondary Al3(Sc1-xZrx) particles are subjected to pin dislocations and grain boundary / sub-boundary in the hot and cold processing process, so that the particles have refined crystalline strengthening, dispersion strengthening and substructure strengthening effects on the alloy. The ratio of the components is reasonable, the preparation process is simple, and the method is suitable for industrial production.

Description

technical field [0001] The invention discloses a microalloyed aluminum alloy and a preparation method thereof, in particular to an aluminum alloy microalloyed with Sc and Zr composites and a preparation method thereof; it belongs to the technical field of aluminum alloy preparation. Background technique [0002] Al-Mg-Mn is a medium-strength, corrosion-resistant, weldable aluminum alloy. Due to its excellent comprehensive properties, it is widely used in aerospace, transportation, ships and other fields. However, with the development of technology and the increasingly changeable application requirements, higher requirements are put forward for the performance of the alloy. Especially the aviation industry has higher requirements in terms of strength and fatigue damage resistance. Microalloying is an important method to improve the strength and fatigue damage resistance of Al-Mg-Mn alloys. There are many micro-alloying elements. After extensive research, it was found that S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06C22F1/047
CPCC22C21/06C22F1/047
Inventor 陈显明潘清林
Owner CENT SOUTH UNIV
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