Substantial improvement in cold formability of concentrated Mg–Al–Zn–Ca alloy sheets by high temperature final rolling

Bian, Mingzhe; Huang, Xinsheng; Chino, Yasumasa

doi:10.1016/j.actamat.2021.117328

Cited by 55 publications

(11 citation statements)

References 72 publications

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“…As a potential lightweight alternative that substitutes for aluminum and high-strength steel alloys, magnesium (Mg) alloys have been greatly developed in recent decades [1][2][3][4]. However, their inherent hexagonal close-packed (HCP) structure would restrict the number of activated slip systems at room temperature (RT) [5,6]. In addition, as one of the most important products of wrought Mg alloys, the sheets prepared by extrusion and rolling always exhibit a strong basal texture [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Unusual Spreading of Strain Neutral Layer in AZ31 Magnesium Alloy Sheet during Bending

Liu

Bai

et al. 2022

Materials

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In this work, we reported an unusual phenomenon of strain neutral layer (SNL) spreading in an as-rolled AZ31B magnesium alloy sheet during V-bending. The SNL on the middle symmetrical surface perpendicular to the transverse direction (TD) of the sheet extended to the compression region and was accompanied by a mound-like feature. However, the SNL on the side surface perpendicular to the TD was distributed with a parallel band feature. The underlying mechanism was revealed by the finite element (FE) analysis. The results indicate that the three-dimensional compressive stresses in the compression region of the bending samples were responsible for the above phenomenon. Moreover, the area of the SNL in the middle position gradually decreased as the bending test progressed. The findings in this study provide some new insights into the bending deformation behavior of magnesium alloy.

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Section: Introductionmentioning

confidence: 99%

Unusual Spreading of Strain Neutral Layer in AZ31 Magnesium Alloy Sheet during Bending

Liu

Bai

et al. 2022

Materials

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“…Magnesium (Mg) and its alloys are lightweight materials that have the potential to decrease CO 2 emissions by improving the fuel efficiency of automobiles [1][2][3]. It is salient to note that the room temperature formability of Mg alloys is restricted due to the limited slip activity and preferential operation of twinning activity instead, which leads to premature failure [4].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Strain Rate Constitutive and Machine Learning Models for Flow Behavior of AZ31-0.5 Ca Mg Alloy during Hot Deformation

et al. 2022

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In this study, isothermal compression tests of highly ductile AZ31-0.5 Ca Mg alloys were conducted at different strain rates (0.001–0.1 s−1) and temperatures (423–523 K) along with extruded direction. The flow stress characteristics were evaluated at elevated temperatures. In addition, a strain-dependent constitutive model based on the Arrhenius equation and machine learning (ML) were constructed to evaluate the stress–strain flow behavior. To build the ML model, experimental data containing temperature, strain, and strain rate were used to train various ML algorithms. The results show that under lower temperatures and higher strain rates, the curves exhibited strain hardening, which is due to the higher activation energy, while when increasing the temperature at a fixed strain rate, the strain hardening decreased and curves were divided into two regimes. In the first regime, a slight increase in strain hardening occurred, while in the second regime, dynamic recrystallization and dynamic recovery controlled the deformation mechanism. Our ML results demonstrate that the ML model outperformed the strain-dependent constitutive model.

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“…The rolling process can refine the grains, improve the structure of magnesium alloys, and significantly improve the mechanical properties of magnesium alloys [ 13 ]. However, due to the close-packed hexagonal structure of magnesium, and the strong (0002) basal texture is easily formed during the rolling process of the sheet [ 14 , 15 ], few slip systems can be activated under common conditions [ 16 ], and rolling will lead to defects in the sheet [ 17 ]. When conventional rolling is used to produce magnesium alloy sheets, there are problems such as a long rolling process, low yield, and high production cost [ 18 ], and the sheet after rolling has high hardness and insufficient ductility.…”

Section: Introductionmentioning

confidence: 99%

“…The recrystallization behavior of magnesium alloys has been extensively discussed by researchers [ 17 , 19 , 20 , 21 , 22 , 23 , 24 ]. The crystallographic defects generated in the rolling process of magnesium alloys can be disappeared through recrystallization annealing, and the grains can be re-formed to eliminate the deformation strengthening effect and residual stress, improve the plasticity, and restore the plastic deformation ability to facilitate further deformation processing [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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In this paper, quasi-in situ experiments were carried out on rolled AZ31 magnesium alloy sheets to track the recrystallization behavior of the rolled microstructure during the heat treatment process and the plastic deformation behavior during the stretching process. The as-rolled microstructures are classified into five characteristics and their plastic deformation behaviors are described. The research shows that annealing recrystallization leads to grain reorganization, resulting in the diversity of grain orientation, and it is easier to activate basal slip. Recrystallization preferentially nucleates in the regions with high stress, while it is difficult for recrystallization to occur in regions with low stress, which leads to the uneven distribution of the as-rolled structure of magnesium alloys. Slip can be better transmitted between small grains, while deformation between large and small grains is difficult to transmit, which can easily lead to the generation of ledges. Incomplete recrystallization is more likely to accumulate dislocations than complete recrystallization, and ledges are formed in the early stage of deformation. Microcracks are more likely to occur between strain-incompatible grains. It is of great significance to promote the application of rolled AZ31 magnesium alloys for the development of heat treatment and subsequent plastic working of rolled magnesium alloys.

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Substantial improvement in cold formability of concentrated Mg–Al–Zn–Ca alloy sheets by high temperature final rolling

Cited by 55 publications

References 72 publications

Unusual Spreading of Strain Neutral Layer in AZ31 Magnesium Alloy Sheet during Bending

Unusual Spreading of Strain Neutral Layer in AZ31 Magnesium Alloy Sheet during Bending

A Comparative Study of Strain Rate Constitutive and Machine Learning Models for Flow Behavior of AZ31-0.5 Ca Mg Alloy during Hot Deformation

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

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