Influence of Natural Aging Time and Mg/Si Ratio (Mg + Si = 1.3 mass%) on the Two-Step Aging Behavior in Al–Mg–Si Alloys

Im, Jung Nam; Jeon, Ju‐Won; Song, MinYoung; Hong, Seung‐Eun; Kim, Jae Hwang

doi:10.1007/s12540-019-00257-8

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…This study only addresses the situation where the Mg–Si cluster is close to the crack; however, there could be significant Mg–Si clusters further away from the crack. Furthermore, the chemical composition of the alloy [ 11 , 16 , 43 ], vacancy concentration [ 43 , 47 ], and dislocation density [ 43 ] all influence the growth rate of Mg–Si clusters. The tensile test was performed using an MD simulation at 0 K with a strain rate of 10 10 s −1 , which is an unrealistic condition for practical deformation.…”

Section: Discussionmentioning

confidence: 99%

“…Aruga et al [ 8 , 9 ] demonstrated that Si-rich clusters are detrimental to the subsequent artificially aged properties; that is, the suppression of Si-rich cluster formation is required to achieve reasonable mechanical properties after artificial aging. Im et al [ 16 ] investigated the bake-hardening response (an increase in yield strength during paint baking) in relation to the Mg/Si ratio. They reported that the bake hardening response depends on the natural aging time because Si-rich clusters predominate during the early stages of natural aging and Mg–Si clusters predominate at later stages.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Dynamics Study on Crack Propagation in Al Containing Mg–Si Clusters Formed during Natural Aging

2023

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The crack propagation behavior of Al containing Mg–Si clusters is investigated using molecular dynamics (MD) simulations to demonstrate the relationship between the natural aging time in Al–Si–Mg alloys and ductility. Experimental results show that the elongation at failure decreases with natural aging. There are few studies on the relationship between natural aging and ductility because of the difficult observation of Mg–Si clusters. To solve the difficulty, cracked Al containing Mg–Si clusters of varying sizes are assumed for the MD simulations. A larger Mg–Si cluster in Al results in earlier crack opening and dislocation emission. Moreover, as the Mg–Si cluster size increases, the stress near the crack tip becomes more concentrated. This causes rapid crack propagation, a similar effect to that of crack tip sharpening. As a result of long-term natural aging, the cracks expand rapidly. The influence of geometry is also investigated. Crack lengthening and thickness reduction negatively impact the fracture toughness, with the former having a larger impact than the latter. Although there are several discrepancies in the practical deformation conditions, the simulation results can help to more thoroughly understand natural aging in Al–Si–Mg alloys.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study on Crack Propagation in Al Containing Mg–Si Clusters Formed during Natural Aging

2023

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“…In the early stage of AA, clusters formed during NA can be decomposed, accompanied by a decrease in the yield strength [ 24 , 25 , 26 , 27 ]. Subsequently, the solute atoms from the clusters recombine to form β″ precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have suggested that Al–Si–Mg alloys with relatively high Si content are vulnerable to NA because Si-rich clusters are difficult to decompose [ 25 , 26 , 27 , 28 ]. However, these studies only inferred the decomposition behavior through the mechanical or thermal properties [ 26 , 27 ]. The size of the clusters formed in NA is so small [ 18 ] that the clusters are difficult to observe.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Composition and Vacancy Concentration on Cluster Decomposition Behavior in Al–Si–Mg Alloy: A Kinetic Monte Carlo Study

et al. 2022

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The influence of cluster composition and the addition of vacancies on the decomposition behavior of clusters during artificial aging in Al–Si–Mg alloys were analyzed according to the kinetic Montel Carlo model. Clusters with a balanced composition (Mg/(Mg + Si) = 0.5) were the most difficult to decompose. In addition, the cluster decomposition was slower when more vacancies were added to the cluster. Among Si, Mg, and vacancies, vacancies most significantly affect decomposition. The clusters with Mg/(Mg + Si) ≤ 0.4 strongly trap vacancies, which can be classified as hardly decomposable vacancy-rich clusters. The clustering behavior during natural aging and the effect of pre-aging were analyzed using the Kinetic Monte Carlo model. Pre-aging slows down cluster formation due to the lowered vacancy concentration. In addition, the overall composition of the clusters changes to easily decomposable clusters after pre-aging. Thus, not only is the number of clusters reduced but also the clusters are more easily decomposable when pre-aging is performed.

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Preliminary Investigations about Effects of Aging Method on Microstructure and Tensile Properties of As-Eextruded Mg-Gd-Y-Mn-Based Magnesium Alloys

Wei,

Yang,

et al. 2024

J. of Materi Eng and Perform

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Influence of Natural Aging Time and Mg/Si Ratio (Mg + Si = 1.3 mass%) on the Two-Step Aging Behavior in Al–Mg–Si Alloys

Cited by 11 publications

References 25 publications

Molecular Dynamics Study on Crack Propagation in Al Containing Mg–Si Clusters Formed during Natural Aging

Molecular Dynamics Study on Crack Propagation in Al Containing Mg–Si Clusters Formed during Natural Aging

Influence of the Composition and Vacancy Concentration on Cluster Decomposition Behavior in Al–Si–Mg Alloy: A Kinetic Monte Carlo Study

Preliminary Investigations about Effects of Aging Method on Microstructure and Tensile Properties of As-Eextruded Mg-Gd-Y-Mn-Based Magnesium Alloys

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