Shear band formation during hot compression of AZ31 Mg alloy sheets

Kim, Hyung Lae; Lee, J.-H.; Lee, C.S.; Bang, Won Kyu; Ahn, Seonghyeon; Chang, Young Won

doi:10.1016/j.msea.2012.08.023

Cited by 52 publications

(12 citation statements)

References 24 publications

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“…The fracture surface analysis of monolithic Mg and its composites under compressive loading conditions reveals the presence of shear bands as shown in Figure 6. The presence of such shear bands indicates the twinning mode of plastic deformation, which is common in Mg alloys and composites [4,36]. …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Nano Boron Nitride Reinforced Magnesium Composites Produced by the Microwave Sintering Method

Seetharaman

Jayalakshmi

Tun³

et al. 2013

Materials

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In this study, magnesium composites with nano-size boron nitride (BN) particulates of varying contents were synthesized using the powder metallurgy (PM) technique incorporating microwave-assisted two-directional sintering followed by hot extrusion. The effect of nano-BN addition on the microstructural and the mechanical behavior of the developed Mg/BN composites were studied in comparison with pure Mg using the structure-property correlation. Microstructural characterization revealed uniform distribution of nano-BN particulates and marginal grain refinement. The coefficient of thermal expansion (CTE) value of the magnesium matrix was improved with the addition of nano-sized BN particulates. The results of XRD studies indicate basal texture weakening with an increase in nano-BN addition. The composites showed improved mechanical properties measured under micro-indentation, tension and compression loading. While the tensile yield strength improvement was marginal, a significant increase in compressive yield strength was observed. This resulted in the reduction of tension-compression yield asymmetry and can be attributed to the weakening of the strong basal texture.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Nano Boron Nitride Reinforced Magnesium Composites Produced by the Microwave Sintering Method

Seetharaman

Jayalakshmi

Tun³

et al. 2013

Materials

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“…It is also noteworthy, that there is evidence that this type of twins can be better activated if the temperature increases [30]. Contraction twins can change the texture do to reorientation and also serve as an effective site for recrystallisation due to their high stored energy, thus generating new grains with different orientations [31,32]. However, the measurements in the context of this work did not reveal evidence of contraction twins especially not in the unrecrystallised fraction of the microstructure.…”

Section: Microstructural Developmentmentioning

confidence: 72%

Microstructure and texture development in hydrostatically extruded Mg–Al–Zn alloys during tensile testing at intermediate temperatures

Victoria-Hernández

Letzig

et al. 2013

Acta Materialia

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Tensile testing of hydrostatically extruded round bars of AZ31 and AZ61 has been performed to analyse the flow behaviour as well as the microstructure and texture development as a function of temperature (175-225 °C) and strain rate (0.0001-0.01). The post-testing microstructure is a result of dynamic recrystallisation with varying significance of different texture components. In some cases the resulting textures are found to be similar to those textures that typically develop during extrusion of rare earth containing magnesium alloys. Dynamic recrystallisation (DRX) and grain boundary sliding (GBS) are considered as the mechanisms that generate the changes in texture. Precipitates can exert a grain boundary pinning effect limiting grain growth. These different mechanisms contribute differently to the texture development if the testing parameters were changed.

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“…Referring to previous studies [4][5][6][7][8][9], Mg wrought alloys are generally suitable for processing at temperatures higher than 300 • C and strain rates lower than 1 s −1 to avoid cracking. At higher temperatures and lower strain rates, non-basal slip systems can be readily activated to accommodate strains, and dynamic recrystallization (DRX) can operate for relaxation of stress concentrations.…”

Section: Introductionmentioning

confidence: 84%

Microstructural Study of a Mg–Zn–Zr Alloy Hot Compressed at a High Strain Rate

et al. 2020

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Understanding the correlation of plasticity with deformation and dynamic recrystallization (DRX) behaviors, in magnesium (Mg) alloys deformed under high-strain-rate conditions, is increasingly important for wrought Mg processing. In the present study, a ZK30 (Mg-2.61%Zn-0.66%Zr by weight percent (wt.%)) alloy in the as-forged state was hot compressed to various strain levels at a temperature of 350 °C and a strain rate of 10 s−1. Heterogeneous deformation and dynamic recrystallization (DRX) behaviors of the complicated microstructures in the deformed samples were analyzed via a grain-partitioning approach based on intra-grain misorientation analysis from electron back-scattered diffraction (EBSD). The ZK30 alloy showed excellent formability, remaining intact at a true strain of −1.11. Continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) via grain boundary corrugation/bulging are the dominant mechanisms for the relaxation of strain energy during hot compression. Initial Zr-rich coarse grains undertook a significant portion of the plastic strain as the compression progressed, reflected by the increased misorientations within their interior and marked change in their aspect ratios. The results indicate that the excellent plasticity of the as-forged ZK30 alloy can be attributed to the operative CDRX mechanisms and the reduced deformation anisotropy of Zr-rich coarse grains containing Zn–Zr nano–precipitates.

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Shear band formation during hot compression of AZ31 Mg alloy sheets

Cited by 52 publications

References 24 publications

Synthesis and Characterization of Nano Boron Nitride Reinforced Magnesium Composites Produced by the Microwave Sintering Method

Synthesis and Characterization of Nano Boron Nitride Reinforced Magnesium Composites Produced by the Microwave Sintering Method

Microstructure and texture development in hydrostatically extruded Mg–Al–Zn alloys during tensile testing at intermediate temperatures

Microstructural Study of a Mg–Zn–Zr Alloy Hot Compressed at a High Strain Rate

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