Effects of high Mg content and processing parameters on Portevin-Le Chatelier and negative strain rate sensitivity effects in Al–Mg alloys

Cho, Chang-Hee; Son, Hyeon-Woo; Lee, Jae-Cheol; Son, Kwang‐Tae; Lee, Ji‐Woon; Hyun, Soong‐Keun

doi:10.1016/j.msea.2020.139151

Cited by 43 publications

(3 citation statements)

References 22 publications

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“…According to the KAM maps in Figure 5 , the region around cracks has a high value of KAM. The KAM value means the misorientation between adjacent points, which is observed via EBSD [ 8 , 11 , 12 ]. In other words, the KAM values are exhibited by the formation of geometrical necessary dislocations, which can be considered as stored energy.…”

Section: Resultsmentioning

confidence: 99%

“…However, it was shown that the addition of Mg content did not contribute to strain distribution and additional mechanical property improvement due to the absence of mechanical twin formation. Furthermore, high Mg content causes the Portevin Le-Chatelier effect and negative strain rate sensitivity effect [ 12 ]. These effects make irregular deformation of Al alloys.…”

Section: Introductionmentioning

confidence: 99%

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Study on Rolling Defects of Al-Mg Alloys with High Mg Content in Normal Rolling and Cross-Rolling Processes

Lim,

Hong,

Kim

et al. 2023

Materials

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This study investigated defect formation and strain distribution in high-Mg-content Al-Mg alloys during normal rolling and cross-rolling processes. The finite element analysis (FEA) revealed the presence of wave defects and strain localization-induced zipper cracks in normal cold rolling, which were confirmed by the experimental results. The concentration of shear strain played a significant role in crack formation and propagation. However, the influence of wave defects was minimal in the cross-rolling process, which exhibited a relatively uniform strain distribution. Nonetheless, strain concentration at the edge and center regions led to the formation of zipper cracks and edge cracks, with more pronounced propagation observed in the experiments compared to FEA predictions. Furthermore, texture evolution was found to be a crucial factor affecting crack propagation, particularly with the development of the Goss texture component, which was observed via electron backscattered diffraction analysis at bending points. The Goss texture hindered crack propagation, while the Brass texture allowed cracks to pass through. This phenomenon was consistent with both FEA and experimental observations. To mitigate edge crack formation and propagation, potential strategies involve promoting the formation of the Goss texture at the edge through alloy and process conditions, as well as implementing intermediate annealing to alleviate stress accumulation. These measures can enhance the overall quality and reliability of Al-Mg alloys during cross-rolling processes. In summary, understanding the mechanisms of defect formation and strain distribution in Al-Mg alloys during rolling processes is crucial for optimizing their mechanical properties. The findings of this study provide insights into the challenges associated with wave defects, strain localization, and crack propagation. Future research and optimization efforts should focus on implementing strategies to minimize defects and improve the overall quality of Al-Mg alloys in industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Rolling Defects of Al-Mg Alloys with High Mg Content in Normal Rolling and Cross-Rolling Processes

Lim,

Hong,

Kim

et al. 2023

Materials

Self Cite

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“…For this reason, under the 373 K conditions, the highest peak stress appeared at the medium strain rate condition, unlike the general deformation behavior. when DSA appears, the strain rate sensitivity exponent has a negative value [7,8]. Therefore, this is also called Negative Strain rate Sensitivity(n-SrS) phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Yang

Kim

Lee

et al. 2021

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Warm Tensile DeformaTion Behavior anD ConsTiTuTive equaTion of supersaTuraTeD soliD-soluTionizeD al-9mg exTruDeD alloy in this paper, as a purpose to apply the supersaturated solid-solutionized Al-9mg alloy to the structural sheet parts of automotive, tensile tests were conducted under the various conditions and a constitutive equation was derived from the tensile test results. Al-9mg alloy was produced using a special mg master alloy containing Al 2 Ca during the casting process and extruded into the sheet. in order to study the deformation behavior of Al-9mg alloy in warm temperature forming environments, tensile tests were conducted under the temperature of 373 K-573 K and the strain rate of 0.001/s~0.1/s. in addition, by using the raw data obtained from tensile tests, a constitutive equation of the Al-9mg alloy was derived for predicting the optimized condition of the hot stamping process. Al-9mg alloy showed uncommon deformation behavior at the 373 K and 473 K temperature conditions. The calculated curves from the constitutive equation well-matched with the measured curves from the experiments particularly under the low temperature and high strain rate conditions.

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New Strategy to Improve the Mechanical Properties in Cast Al–Mg–Fe Alloys by the Formation of Al–AlFe Eutectic

et al. 2021

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Fe-containing intermetallics are often detrimental to the mechanical properties in aluminum alloy. However, an Al-Fe alloy system can form an Al þ AlFe eutectic structure in a narrow freezing range, providing the fine Al 13 Fe 4 or Al 6 Fe intermetallics. Herein, the ternary Al-Mg-Fe alloy is selected to achieve the Al þ AlFe eutectic structure composition and form fine AlFe intermetallics for improving the strength and ductility of Al-Mg cast alloy. The results show that as the composition of Al-Mg-Fe alloy is closer to the Al þ AlFe eutectic composition, the amount of coarse Al 13 Fe 4 intermetallics decreases, whereas the amount of fine Al þ Al 13 Fe 4 eutectic increases. The microstructural evolution results in the improvement of yield strength (72.8-92.4 MPa), tensile strength (126.1-213.7 MPa), and the elongation (2.5-6.2%). This work provides a new strategy to improve the mechanical properties in Al-Mg cast alloy.

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Effects of high Mg content and processing parameters on Portevin-Le Chatelier and negative strain rate sensitivity effects in Al–Mg alloys

Cited by 43 publications

References 22 publications

Study on Rolling Defects of Al-Mg Alloys with High Mg Content in Normal Rolling and Cross-Rolling Processes

Study on Rolling Defects of Al-Mg Alloys with High Mg Content in Normal Rolling and Cross-Rolling Processes

Archives of Metallurgy and Materials

New Strategy to Improve the Mechanical Properties in Cast Al–Mg–Fe Alloys by the Formation of Al–AlFe Eutectic

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