Formation of Fine-Grained Structure and Superplasticity in Commercial Aluminum Alloy 1565ch

The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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“…A non-heat treatable conventional Al-Mg-based alloy [41] was studied in the present research. The alloy chemical composition is shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Samples subjected to the IMF with ∑e = 6.3 (mode A) were annealed at 450, 500, and 540 °C for 30 min. The solidus temperature of an alloy is 560 °C [41]. The grain structure exhibited bimodality after annealing in a studied temperature range ( Figure 5).…”

Section: Grain Structure Evolution Of Imf Proceeded Samples At Annealmentioning

confidence: 98%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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“…A commercial Al–Mg-based alloy (Russian grade 1565ch [58]) was studied. The chemical composition of the investigated alloy is shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

et al. 2018

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The effect of isothermal multidirectional forging (IMF) on the microstructure evolution of a conventional Al–Mg-based alloy was studied in the strain range of 1.5 to 6.0, and in the temperature range of 200 to 500 °C. A mean grain size in the near-surface layer decreased with increasing cumulative strain after IMF at 400 °C and 500 °C; the grain structure was inhomogeneous, and consisted of coarse and fine recrystallized grains. There was no evidence of recrystallization when the micro-shear bands were observed after IMF at 200 and 300 °C. Thermomechanical treatment, including IMF followed by 50% cold rolling and annealing at 450 °C for 30 min, produced a homogeneous equiaxed grain structure with a mean grain size of 5 µm. As a result, the fine-grained sheets exhibited a yield strength and an elongation to failure 30% higher than that of the sheets processed with simple thermomechanical treatment. The IMF technique can be successfully used to produce fine-grained materials with improved mechanical properties.

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“…However, if in the process of applying a tensile force to the material, the tensile force exceeds the stress of the thinnest material, the material would be scrapped due to the excessive tensile force. Typically, the problem to be prevented in deep drawing of materials is cracking and wrinkling [ 18 ]. Whether cracking and wrinkling can occur in the deep drawing is related to the thickness value of sheet metal and the degree of deformation.…”

Section: Aluminum Alloy Rail Vehicle Side Window Forming Designmentioning

confidence: 99%

Theoretical Investigation of Forming Process of Aluminum Alloy Rail Vehicle Side Window

Chen

et al. 2022

Materials

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With the vigorous development of rail transit trains around the world and the emergence of global environmental pollution and energy shortages, the world has an urgent need for manufacturing technology for lightweight aluminum alloy rail transit train components. This paper mainly studied the superplastic forming law of 5083Al for rail transit. Through the high-temperature tensile test and blowing forming experiments, the superplastic properties of 5083Al were determined. Based on this, the die design, finite element simulation, and forming experiment of the rail vehicle side window were carried out. In order to study the superplastic deformation behavior of industrial 5083Al under complex stress conditions, the influence of the depth, area ratio, and friction coefficient of the pre-forming die on the part thickness distribution is simulated. The side window is made of a high-strength 5083Al sheet in the form of bending at both ends to ensure the strength of the connection between the overall side window and the side wall skeleton. The variation law of the side wall forming height of 5083Al box-shaped parts was studied. The efficient manufacture of parts that meet quality standards was made possible by the optimization of the pressure profile. The microstructure changes of the material after superplastic forming were studied by Energy Dispersive Spectrometer (EDS) and Electron Backscattered Diffraction (EBSD).

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Formation of Fine-Grained Structure and Superplasticity in Commercial Aluminum Alloy 1565ch

Cited by 12 publications

References 5 publications

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

Theoretical Investigation of Forming Process of Aluminum Alloy Rail Vehicle Side Window

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