Flow Stress Characteristics of AZ31B Magnesium Alloy Sheet at Elevated Temperatures

Li, Wenjuan; Guo-qun, Zhao; Ma, Xiang; Gao, Jun

doi:10.7763/ijapm.2012.v2.59

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…These small amounts of recrystallized grains were suggested to be the result of an increasing contribution of rotational recrystallization mechanism in the recrystallized grains due to the limited time for diffusion [36,37]. Li et al [38] also found the strain softening due to DRX did not occur in the tensile testing of AZ31B Mg alloy at 50-150 C with strain rates lower than 0.1 s À1 .…”

Section: Microstructural Evolutionmentioning

confidence: 96%

Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction

Shen

Ding

et al. 2017

J. Manuf. Sci. Eng

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The use of magnesium (Mg) alloy has been continuously on the rise with numerous expanded application in transportation/aerospace industries due to their lightweight and other areas, such as biodegradable medical implants. It was shown recently that machining can be used to improve the functional performance of Mg-based products/components, such as corrosion resistance, through engineered surface integrity. In this paper, the behavior of AZ31B Mg alloy in cryogenic machining was discussed firstly. The surface integrity can be significantly improved by introducing the ultrafine grained (UFG) layer due to the severe plastic deformation (SPD) effect during cryogenic machining. The mechanisms of microstructure evolution and plastic deformation were analyzed based on the experimental findings in literature. A physics-based constitutive model involving material plasticity and grain refinement is developed based on both slip and twinning mechanisms and successfully implemented in a finite-element (FE) analysis with multiple cutting passes to predict the microstructure evolution by nanocrystalline grain refinement and other improvement of the surface integrity in the cryogenic machining of AZ31B Mg alloy. With a more quantitative assessment, the FE model results are further discussed for grain refinement, changes in microhardness, residual stresses, and slip/twinning mechanism with the apparent SPD taking place due to rapid cryogenic cooling.

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Section: Microstructural Evolutionmentioning

confidence: 96%

Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction

Shen

Ding

et al. 2017

J. Manuf. Sci. Eng

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show abstract

“…On one side, it may be ascribed to the different potentials used, and on the other side, the applied strain rate plays a critical role. It is well known that the flow stress drops with a deformation rate increase, not only in the Mg system [51,52] but also in other metallic systems such as copper (Cu) [53]. Note that our compression rate (1 × 10 9 s −1 ) is ten times lower than that in the work of Hasan…”

Section: Stress-strain Curvesmentioning

confidence: 62%

Temperature Effect on the Deformation Behavior in Nanocrystalline Magnesium under Compression: An Atomistic Study

Zhang,

Xu,

et al. 2023

Crystals

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The classic molecular dynamics (MD) simulation approach has been used to investigate the microstructure change in polycrystalline magnesium (Mg) during compressive deformation at various temperatures. At low temperatures, there exists a competition between the sliding of Shockley partial dislocation (SPD) and perfect <a> dislocation. Abundant dislocation behaviors such as dislocation bundle and double cross slipping are observed. With a temperature increase, the dislocation sliding is hindered by the newly formed grain boundaries (GBs). The grain reorientation should be the compensatory mechanism for plastic deformation at high temperatures. Furthermore, dynamic recrystallization (DRX) is found at the highest temperature investigated. For all the temperature cases studied, twinning is unsensitive against applied compressive stress. The results of this work may help to understand the temperature effect on the mechanism in polycrystalline Mg under compressive deformation.

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“…The exponential model developed by Wen-juan et al [37] was used to define the behavior of AZ31B, while the Johnson-Cook constitutive equations [38] were used for the definition of the stress-strain curves of Ti6Al4V.…”

Section: Finite Element Modeling and Simulation Preparationmentioning

confidence: 99%

Data-Analytics-Driven Selection of Die Material in Multi-Material Co-Extrusion of Ti-Mg Alloys

Fernández,

Rodríguez-Prieto,

Camacho

2024

Mathematics

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The selection of the most suitable material is one of the key decisions to be made during the design stage of a manufacturing process. Traditional approaches, such as Ashby maps based on material properties, are widely used in industry. However, in the production of multi-material components, the criteria for the selection can include antagonistic approaches. The aim of this work is to implement a methodology based on the results of process simulations for several materials and to classify them by applying an advanced data analytics method based on machine learning (ML)—in this case, the support vector regression (SVR) or multi-criteria decision-making (MCDM) methodology. Specifically, the multi-criteria optimization and compromise solution (VIKOR) was combined with entropy weighting methods. To achieve this, a finite element model (FEM) was built to evaluate the extrusion force and the die wear during the multi-material co-extrusion process of bimetallic Ti6Al4V-AZ31B billets. After applying SVR and VIKOR in combination with the entropy weighting methodology, a comparison was established based on material selection and the complexity of the methodology used. The results show that the material chosen in both methodologies is very similar, but the MCDM method is easier to implement because there is no need for evaluating the error of the prediction model, and the time required for data preprocessing is less than the time needed when applying SVR. This new methodology is proven to be effective as an alternative to traditional approaches and is aligned with the new trends in industry based on simulation and data analytics.

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Flow Stress Characteristics of AZ31B Magnesium Alloy Sheet at Elevated Temperatures

Cited by 10 publications

References 9 publications

Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction

Enhanced Surface Integrity From Cryogenic Machining of AZ31B Mg Alloy: A Physics-Based Analysis With Microstructure Prediction

Temperature Effect on the Deformation Behavior in Nanocrystalline Magnesium under Compression: An Atomistic Study

Data-Analytics-Driven Selection of Die Material in Multi-Material Co-Extrusion of Ti-Mg Alloys

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