Enhanced strength-plasticity combination in an Al–Cu–Mg alloy——atomic scale microstructure regulation and strengthening mechanisms

Chen, Zhiguo; Ren, Jieke; Yuan, Zhengui; Ringer, Simon P.

doi:10.1016/j.msea.2020.139447

Cited by 48 publications

(4 citation statements)

References 41 publications

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“…This can be attributed to the formation of a strong P component in the 30-min sample. The P orientation has a much larger Taylor factor (4.71) compared to the Cube component (2.71) [ [55] , [56] , [57] , [58] ]. Therefore, the P texture is a very hard orientation compared to the soft Cube component.…”

Section: Resultsmentioning

confidence: 99%

High-temperature annealing behavior of cold-rolled electrolytic tough-pitch copper

Solouki,

Jamaati,

Jamshidi Aval

2024

Heliyon

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Section: Resultsmentioning

confidence: 99%

High-temperature annealing behavior of cold-rolled electrolytic tough-pitch copper

Solouki,

Jamaati,

Jamshidi Aval

2024

Heliyon

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“…For the singleton solid solution atoms, the model is based on weak pinning (Labusch [59] ). For the solute clusters, their relative contributions were calculated based on the three standard models (linear, [60][61][62][63] general superposition, [64][65][66] and areal glide [50,65] ). There is no evidence of intragranular or intergranular precipitates.…”

Section: Modelingmentioning

confidence: 99%

First‐Principles Design of Alloy Systems, Part I: Effects of Solute Type, Concentration, and Distribution on Alloying and Mechanical Properties – As‐Quenched Dilute Al (Mg, Si) Alloys

Samiee,

Shahmiri,

Sorrell

2023

Adv Eng Mater

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Solid solution strengthening is a well‐known strengthening mechanism for the 4xxx (Al‐Si alloys), 5xxx (Al‐Mg alloys), and 6xxx (Al–Mg–Si alloys). The distribution of solute atoms plays an important role in optimisation of the mechanical properties (increasing both the strength and ductility) of the alloys. While the distribution of solute atoms in the solid solution generally is assumed to be homogenous, solute clusters formed from randomly distributed solute atoms challenges this general assumption. Both dilute Al alloys (Al–Mg, Al–Si, and Al–Mg–Si) were solution treated at 450°C for 2 h and then quenched in room‐temperature water. They were analysed by atom probe tomography and these data have been employed in order to assess the 3D distribution of solute atoms in the solid solutions. The effects of the 3D distribution of solute atoms on the solid solution strengthening were also examined by mechanical testing (microhardness, tensile testing). An innovative approach was to abstain from conventional logic of binary vs ternary alloys in data analysis in favour of a less‐concentrated vs more‐concentrated strategy. This approach enables for the first time the integration of first principles Condon‐Morse atomic interaction effects, APT, and mechanical testing, which resulted in a novel empirical singleton‐cluster plot. The plot allows differentiation between singletons, solute clusters, and co‐clusters as well as between the less‐concentrated and more‐concentrated alloys. The plot also allows determination of the maximal yield strengths from cluster strengthening and from singletons in the absence of clustering. Most critically, this new approach in data analysis allows for the first time the determination of the d max based on experimental results. The APT statistical data analysis and the materials properties are underpinned by the newly identified differentiating roles of field, proximity, chemical, and atomic size effects on the distribution and homogeneity of the singletons and solute clusters. The singleton strengthening of the less concentrated dilute binary alloys is dominated by the field effect while cluster strengthening of the more concentrated dilute binary alloy inevitably is dominated by the proximity effect. In contrast, the co‐cluster strengthening of the less and more concentrated dilute ternary alloys involves a transition that is dependent largely on the dominance of the chemical effect over the proximity effect . A singular observation from these data is that the more concentrated dilute binary alloy exhibit simultaneous increases in both strength and ductility. Finally, the data for ductility and number densities of singletons and clusters suggests the dominant role of the proximity effect over that of the field and chemical effects.This article is protected by copyright. All rights reserved.

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“…Furthermore, the solutionization of the FSP stir zone region of these alloys could be confirmed by this natural aging study. Firstly, all the FSP alloys showed an incremental increase in yield strength and ultimate tensile strength with natural aging which can only be possible with a solutionized microstructure which evolves in strength by the formation of clusters or small GP zones [34][35][36][37]. Secondly the stress fluctuations that appear in Figure 7(a) for FSP 7055 alloy are called Portevin Le-Chatelier effect (PLC) caused by impedance of dislocation flow against obstacles such as clusters or GP zones which produces high stress locations [38][39][40].…”

Section: Microstructure and Hardness Profilementioning

confidence: 99%

Improving Local Formability of Aluminum 6xxx and 7xxx Alloy Sheets using Friction Stir Processing for Automotive Applications

Wahaz¹,

Das²,

Upadhyay

et al. 2022

Preprint

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Friction stir processing (FSP) on a gantry setup was implemented on various high-strength commercial aluminum sheet metals, including 7085-T76, 7075-T6, 7055-T6, and 6111-T6, to improve the local formability of each alloy. Samples subjected to FSP were bend tested over a safe-to-fracture range by incrementally decreasing the radii of bending to find the radius to thickness ratio (r/t) at fracture. The locally processed region showed a formability improvement of 20% in 7075, 37% in 7055, 41% in 7085, and 71% in 6111 compared to the base alloys. A natural aging study on the FSP alloys showed only 12 hours of natural aging had lowered the elongation-to-fracture back to the base level for 7075 alloy, showing limited shelf life for forming applications for that alloy, whereas 6111 and 7055 alloys retained their elongationto-fracture improvements above the base alloy even after 2 weeks of natural aging. Effects of surface roughness on bending performance was tested on the 7085 alloy where a polished surface after FSP showed a slight improvement in r/t at fracture. Furthermore, the top and bottom surfaces of the processed sheet were bend tested at tension and compression, and the results showed that specimens processed at lower tool-head rotational speeds tended to fracture under tension but not under compression. Finally, FSP was incorporated into a robot tool head to evaluate the feasibility of local FSP for commercial applications at higher welding speeds of up to 5 m/min compared to the current gantry setup with its maximum welding speed of 2.9 m/min.

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Enhanced strength-plasticity combination in an Al–Cu–Mg alloy——atomic scale microstructure regulation and strengthening mechanisms

Cited by 48 publications

References 41 publications

High-temperature annealing behavior of cold-rolled electrolytic tough-pitch copper

High-temperature annealing behavior of cold-rolled electrolytic tough-pitch copper

First‐Principles Design of Alloy Systems, Part I: Effects of Solute Type, Concentration, and Distribution on Alloying and Mechanical Properties – As‐Quenched Dilute Al (Mg, Si) Alloys

Improving Local Formability of Aluminum 6xxx and 7xxx Alloy Sheets using Friction Stir Processing for Automotive Applications

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