Compound forming of 7075 aluminum alloy based on functional integration of plastic deformation and thixoformation

Chen, Qiang; Chen, Gang; Ji, Xinghua; Han, Fei; Zhao, Zhongxing; Jia, Wenbao; Xiao, Xinquan

doi:10.1016/j.jmatprotec.2017.03.023

Cited by 27 publications

(9 citation statements)

References 17 publications

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“…2c) It is important to be noted that, thixoforming process results in the AlCu microstructure on the globular shape and fine, which is very essential for increasing the mechanical properties [12]. Such structures could be obtained by thixoforming process with appropriate parameters of pressure and temperature [13,14].…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Aluminium Matrix Composite Using Thixoforming Process for High Strength Material Components

Afandi¹,

Zulfia²

2019

JMSE-A

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Aluminium-based MMCs (metal matrix composites) have many potential applications in the automotive manufacturing industry, aerospace and military because the aluminum has a low density. Aluminum as a matrix with Al 2 O 3 reinforcement has attracted interest to be developed in order to improve the mechanical property. The study carried out the formation of Al-5%Cu-4%Mg matrix with the reinforcement of Al 2 O 3 by thixoforming process. In this paper, we studied the effect of semisolid thixoforming process on strength of Al-5%Cu-4%Mg matrix. The matrix used here was doped by Al 2 O 3 with the volume fraction from 5% to 20%. It is found that strength of MMCs significantly increases with increasing volume fraction of Al 2 O 3 reinforcement from 5% to 20%. This is due to a good wettability in interface region such as formation of spinel MgAl 2 O 4 phase. Moreover, toughness of MMCs increases by process of semisolid thixoforming due to evolution of microstructure such as globular and fine grain structures. These results indicate that the thixocasting process conducted in this study could increase the value of the matrix hardness and tensile strength, so that such process opens up opportunity for application in the manufacturing industry.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Aluminium Matrix Composite Using Thixoforming Process for High Strength Material Components

Afandi¹,

Zulfia²

2019

JMSE-A

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“…Using the same method, data (including the volume fraction, the grain size, and ln Z after dynamic recrystallization) involving different conditions could be obtained (Table 2). By substituting the data in Table 2 into Equations (11) and (12), the dynamic model for dynamic recrystallization of the 6082 Al alloy is expressed as follows:…”

Section: Modeling Of Dynamic Recrystallizationmentioning

confidence: 99%

“…As one important means for the structural refinement of materials, dynamic recrystallization is used in the optimization of technological parameters for material formation and prediction and control over the microstructure. It is thought that metals (e.g., Al and Al alloys) with a high stacking fault energy are mainly subjected to dynamic recovery while barely undergoing dynamic recrystallization during thermoplastic deformation [10,11]. Additionally, it is also hard to observe fine subgrain structures in these metals through metallography; however, with the development of electron microscopy, the low-angle grain boundary (LAB) of subgrains can be observed using electron backscatter diffraction (EBSD) technology.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Behavior and Processing Map of the 6082 Aluminum Alloy

Dao-chun

Wang

2020

Materials

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Multiple hot-compression tests were carried out on the 6082 aluminum (Al) alloy using a Gleeble-1500 thermal simulation testing machine. Data on flow stresses of the 6082 Al alloy at deformation temperatures of 623 to 773 K and strain rates from 0.01 to 5 s−1 were attained. Utilizing electron backscatter diffraction (EBSD) and a transmission electron microscope (TEM), the dynamic recrystallization behaviors of the 6082 Al alloy during hot compression in isothermal conditions were explored. With the test data, a hot-working processing map for the 6082 Al alloy (based on dynamic material modeling (DMM)) was drawn. Using the work-hardening rate, the initial critical strain causing dynamic recrystallization was determined, and an equation for the critical strain was constructed. A dynamic model for the dynamic recrystallization of the 6082 Al alloy was established using analyses and test results from the EBSD. The results showed that the safe processing zone (with a high efficiency of power dissipation) mainly corresponded to a zone with deformation temperatures of 703 to 763 K and strain rates of 0.1 to 0.3 s−1. The alloy was mainly subjected to continuous dynamic recrystallization in the formation of the zone. According to the hot-working processing map and an analysis of the microstructures, it is advised that the following technological parameters be selected for the 6082 Al alloy during hot-forming: a range of temperatures between 713 and 753 K and strain rates between 0.1 and 0.2 s−1.

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“…Al and aluminum alloys) with a high stacking fault energy were mainly subjected to dynamic recovery but little dynamic recrystallization during thermoplastic deformation. 10,11 It is difficult to observe fine subgrain structures in these metals through metallography. However, with the development of electron microscopy, the low-angle grain boundaries (LABs) of subgrains can be observed by using electron backscatter diffraction (EBSD).…”

Section: Introductionmentioning

confidence: 99%

Dynamic recrystallization behavior of 6082 aluminum alloy during hot deformation

Hua

2021

Advances in Mechanical Engineering

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The dynamic recrystallization behaviors of 6082 aluminum alloy in the temperature range of 623–773 K and strain rate range of 0.01–5 s−1 were studied by electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). According to the experimental results, dynamic recrystallization occurs during hot deformation of 6082 aluminum alloy, although the true stress-strain curve has no obvious single peak characteristic, and the degree of dynamic recrystallization is closely related to the Z parameter. Hot compression with lnZ = 24.9014 (723 K, 0.1 s−1) gives rise to the highest recrystallization fraction of 38.6%. The initial critical strain of dynamic recrystallization was determined by the work hardening rate. The quantitative relationship between the critical strain and Z parameters was established: [Formula: see text]. Based on the EBSD analysis and measurement results, dynamic recrystallization kinetics models of 6082 aluminum alloy during hot deformation were deduced. Microstructure analysis showed that the subgrain structure formed in the original grain is coarsened by grain boundary migration, and the orientation difference increases continuously until a large-angle grain boundary forms, resulting in dynamic recrystallization of grains. The likely mechanism is continuous dynamic recrystallization.

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Compound forming of 7075 aluminum alloy based on functional integration of plastic deformation and thixoformation

Cited by 27 publications

References 17 publications

Fabrication of Aluminium Matrix Composite Using Thixoforming Process for High Strength Material Components

Fabrication of Aluminium Matrix Composite Using Thixoforming Process for High Strength Material Components

Dynamic Recrystallization Behavior and Processing Map of the 6082 Aluminum Alloy

Dynamic recrystallization behavior of 6082 aluminum alloy during hot deformation

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