Before reading the article, please kindly click on the "Follow" button in the upper right corner to facilitate your discussion and forwarding, and continue to follow high-quality daily content~With the increasing demand for marine resources by humans, the requirements for marine equipment and related materials are also increasing. 5083 aluminum alloy is a typical Al Mg alloy with good corrosion resistance, welding performance, and processing performance

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With the increasing demand for marine resources by humans, the requirements for marine equipment and related materials are also increasing. 5083 aluminum alloy is a typical Al Mg alloy with good corrosion resistance, welding performance, and processing performance. It is widely used in fields such as navigation, communication, energy, and communication. However, 5083 aluminum alloy still experiences problems such as pitting corrosion, intergranular corrosion, exfoliation corrosion, and stress corrosion cracking during use, which have adverse effects on the service life and safety of the product. How to balance the mechanical properties and corrosion resistance of 5083 aluminum alloy has become a focus of attention.

Based on this, this article selects the two main components of 5083, Mg and Mn, as the research objects, and designs alloys with different Mg and Mn contents to study their effects on microstructure, mechanical properties, and corrosion resistance, in order to obtain the optimal composition.

experiment

GB/T 31902008experiment5083SXL-1700C460,24hARL iSpark 8860experiment5083experimentexperimentGB/T 228.12010Shimadzu AGS-XexperimentexperimentGB/T 4340.12009HXD-1000TM/LCDRigaku D/MAX 2500VXXRD1090,6/min

GB/T 226392008experiment100mm30mm3mm, experiment651.0mol/L+0.25mol/L+0.01mol/L+0.09mol/L24h, 30sMgMn

Results and Analysis

Simulation of Equilibrium Phase and Mechanical Properties with Different Mg and Mn Content

Calculate and simulate the equilibrium phase and mechanical properties of L1~L16 alloys using JMatPro software. Simulation of room temperature equilibrium phase and mechanical properties of L1 alloy, and room temperature equilibrium phase and tensile strength of L1-L16 alloy. The L1-L16 alloy mainly contains phases such as Al, Al3Mg2, AlCrMgMn, Mg2Si, Al6Mn, etc. As the Mg content increases, the proportion of Al3Mg2 phase gradually increases; As the Si content increases, the proportion of Mg2Si phase formed by binding with Mg gradually increases; When the Mn content is very low, AlCrMgMn phase is preferentially formed. When the Mn content exceeds 0.5%, Al6Mn phase is formed. It is worth noting that as the proportion of Al6Mn phase increases, the proportion of AlCrMgMn phase decreases, and the two phases show a trend of increasing and decreasing. The compressive strength of alloys L5, L11, L14, and L15 is relatively high, with the tensile strength of alloy L15 reaching 252.61MPa. Based on Table 1, it can be seen that the corresponding component of alloy L15 with the highest tensile strength is
4.9Mg-0.85Mn-0.4Cr-012Zn-0.25Si.

The Effect of Mg and Mn on the Mechanical Properties and Fracture Structure of 5083

experiment206.4 MPa, 164.7 MPa; 14.10%,6.88%,10%,

When the Mg content ranges from 4.30% to 4.50%, the Mn content ranges from 0.70% to 0.85%, the Mg content ranges from 4.80% to 4.99%, and the Mn content ranges from 0.40% to 0.80%, 5083 aluminum alloy has higher tensile strength. When the Mg content ranges from 4.10% to 4.40% and the Mn content ranges from 0.30% to 0.50%, the alloy has lower tensile strength. When the Mn content is extremely low, the change in Mg content has little effect on the elongation of 5083. When the Mg content increases to 4.7%, the alloy still has high plasticity and toughness. As the Mn content increases, the elongation of the alloy decreases rapidly, and the plasticity and toughness decrease rapidly. When the Mg content is between 4.10% to 4.40% and the Mn content is between 0.30% to 0.50%, the elongation of the alloy is relatively low. However, when the Mn content is between 0.60% to 0.80% and the Mg content is between 4.20% to 4.40% or 4.80% to 4.99%, the elongation of the alloy increases, indicating a slight improvement in the plasticity and toughness of the alloy.

Perform SEM and EDS analysis on the tensile fracture surfaces of T2, T4, T7, and T12 alloys. When the Mn content in the alloy is low, the size and depth of the dimples are larger, and the plastic characteristics of the fracture surface are obvious. The composite phase particles containing Al, Mg, and Cr exhibit obvious cracks, which are more brittle compared to the Al matrix, and are one of the reasons for the alloy fracture. When the Mn content increases to more than 0.5%, the size and depth of the tensile fracture dimples are smaller and shallower, and the brittleness characteristics are relatively obvious. A large number of white particles are distributed at the depths and shallower parts of the dimples, and their sizes and shapes are different. Some larger composite particles containing Al, Mg, Mn, and Fe appear cracks, showing a more obvious brittleness compared to the Al matrix.

Based on EDS analysis results and related studies, the second phase particles at points C and D are Al6 (Mn, Fe) phases. Some studies suggest that although the addition of Mn can alter the morphology of Fe containing phases in aluminum alloys, reducing their harm to the mechanical properties of the alloy and enhancing its strength, more insoluble crystalline phases are also formed in the alloy. During plastic deformation, the interface between these insoluble phases and the Al matrix is prone to forming small cracks, leading to fracture. In this study, alloys with Mn content exceeding 0.5% exhibited obvious brittle characteristics in tensile fracture compared to alloys with extremely low Mn content.

The Effect of Changes in Mg and Mn Content on the Phase of 5083 Alloy

The Effect of Mg and Mn on the Peeling Corrosion of 5083

Y1Y2Y3Y4experiment24hMg4.31%4.43%,MgMg4.78%GB/T 226392008Y1Y3PAY2PBY4PC

Conduct SEM and EDS analysis on the corroded surfaces of Y1, Y2, Y3, and Y4 alloys. When the Mg content is 4.31%~4.43%, there are many independent or continuous corrosion pores on the surface of the alloy. Some corrosion pores are connected in a network, but the non corroded part of the alloy still presents a relatively flat morphology. Among them, composite particles such as Al Mg Mn Fe, Al Mn Fe Si, Al Mn Fe are distributed on the surface of the alloy and are not corroded. The Al matrix around these composite phase particles exhibited varying degrees of corrosion, with a certain potential difference between the second phase particles and the Al matrix. Under the influence of the corrosive medium, local micro batteries were formed, leading to preferential corrosion of the interface between the composite phase and the Al matrix. When the Mg content is 4.78%, deep corrosion pits appear on the surface of the alloy, while most of the remaining surfaces exhibit a stepped morphology, indicating that some alloys have fallen off in a block like manner and exhibit obvious peeling corrosion characteristics.

Composition optimization verification of 5083 alloy

experimentMg4.3%4.4%Mn0.7%0.8%5083Mg4.3%4.4%Mn0.5%0.6%50835083H,Mg4.38%,Mn0.61%,

experimentT1T16,HH202.8 MPa,13.9%;Mg4.38%,Mn0.61%GB/T 226392008HPA

In T1 to T4 alloys, the strengthening effect of Mg in 5083 alloy was studied under extremely low Mn content conditions. In T4 alloy with a Mg content of 4.71%, the tensile strength is 180.2 MPa. The tensile strength of T2 alloy with a Mg content of 4.98% is only 148.5MPa. The tensile strength of the alloy did not increase with the increase of Mg, mainly due to the excess of Mg element, which leads to the easy combination of Si element and Mg element to form Mg2Si phase, reducing the solubility of Mg in the matrix, and resulting in a decrease in tensile strength and plasticity. The effects of different Mg and Mn contents on the mechanical properties of T5-T16 alloys were studied. Comparing T2 alloy with T12 alloy, when the Mg element content is close, 0.68% Mn element is added, and the tensile strength of the alloy is increased from 148.5MPa to 206.4MPa.

conclusion

1)Mg4.3%4.4%,5083Mn0.7%0.8%5083Mn0.5%0.6%5083experiment5083MgMnMg4.38%,Mn0.61%,5083202.8 MPa, 13.9%,PA

2) The Mg content ranges from 4.3% to 4.43%, and the corrosion characteristic of 5083 alloy is mainly pitting corrosion. As the Mg content increases to 4.7%, peeling corrosion becomes more and more obvious. The interface between the Al Mg Mn Fe, Al Mn Fe Si, Al Mn Fe composite phases formed by Mg and Mn in 5083 alloy and the aluminum matrix is the main source of exfoliation corrosion. These brittle phases also reduce the plasticity and toughness of 5083 alloy.

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