Dislocation density based model for Al-Cu-Mg alloy during quenching with considering the quench-induced precipitates

Guo, Ruichao; Wu, Jianjun

doi:10.1016/j.jallcom.2018.01.135

Cited by 17 publications

(5 citation statements)

References 34 publications

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“…The presence of fine precipitates in the matrix hinders the dislocation motion and results in the strengthening effect, which mainly depends on the size, volume fraction, characteristics, and properties of the precipitates. According to literature [28,29], the interactions between dislocations and precipitated phases can be explained by two precipitation enhancement mechanisms, namely, the by passing and by cutting mechanisms [30]. The two strengthening mechanisms may appear in the aging process.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Relationship between the microstructure and properties of a peak aged Cu–Ni–Co–Si alloy

Jiang

Huang²,

Mi³

et al. 2019

Materials Science and Technology

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The microstructure and properties of a Cu–Ni–Co–Si alloy were investigated through high-resolution transmission electron microscopy and three-dimensional atom probe analysis after aging at 500°C for various times. Characterisation along different diffraction directions showed that precipitate morphology was disk shaped. The concentration profiles for Ni, Co, and Si were flattened in the precipitate interiors at levels of approximately 30, 35, and 35 at.-%, respectively. The co-segregation of Co was more significant than that of Ni and Si owing to the extremely low solubility in the matrix at room temperature. Theoretical calculations excellently agreed with the experimental data, which demonstrated that solid solution scattering and the Orowan bypass mechanism were the key reinforcement mechanisms for electrical and mechanical properties, respectively. Highlights The crystallography and morphology of precipitates in a peak aged Cu–Ni–Co–Si alloy are investigated in detail at different diffraction directions. Disk-shaped (Ni, Co)2Si precipitates are confirmed through 3DAP characterization. The distribution maps of Ni, Co, and Si alloying elements are investigated. Meanwhile, the segregation of the elements in the alloy are analyzed. The strengthening mechanism and conductivity curve of Cu–1.82 Ni–1.62 Co–0.86 Si alloy (wt-%) aged at 500°C for 2 h (peak aged state) are discussed, and theoretical calculations are in excellent agreement with the experimental data.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Relationship between the microstructure and properties of a peak aged Cu–Ni–Co–Si alloy

Jiang

Huang²,

Mi³

et al. 2019

Materials Science and Technology

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“…Lower cooling rates reduced the tensile strength and yield strength due to a decreased amount of fine precipitates, and reduced the residual stress with the reduction of plastic strain and the degree of inhomogeneous plastic deformation. Guo [16] established a dislocation density-based model for accurate prediction of residual stress for as-quenched Al-Cu-Mg alloy, which considered the influences of precipitation, solid solution and forest dislocation. The results showed that volume fraction of precipitates decreased with the increasing temperature and cooling rate, in contrast to the increasing trend for the radius of precipitates.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Pressing and Aging on Reduction and Evolution of Quenched Residual Stress for Al-Zn-Mg-Cu T-Type Rib

et al. 2021

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The preparation of the Al-Zn-Mg-Cu T-type rib consisted of forging, quenching, cold pressing, aging and the final machining processes, and the evolution of residual stress played a significant role in its properties and accuracy. Numerical models were established to investigate the evolution and distribution of residual stress for the T-type rib during the quenching and cold pressing processes. The results showed that the distribution of residual stress at the stiffened area is asymmetrical, which is different from the symmetrical distribution at the smooth area. The cold pressing is beneficial for the reduction of residual stress. The stepwise cold pressing resulted in the heterogeneous distribution of residual stress at the stiffened area and the overlap region. Three comparative T-type ribs were conducted, and their residual stresses were measured using X-ray diffraction and the contour method. A stress reduction of 50% can be obtained at the surfaces of the T-type rib through cold pressing followed by the aging process. The reduction of the maximum tensile stress at the stiffened area of the T-type rib was 42% and 50% for the cold pressing and aging, respectively, which increased to 54% and 60% at the smooth area. The mechanism of the stress reduction during the cold pressing and the aging processes was discussed.

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“…The previous study tried to build the constitutive model of as-quenched alloys, e.g. the physical model, the phenomenological model and the artificial neural network model (Guo and Wu, 2018; Yang et al , 2015; Chobaut et al , 2015; Li et al , 2017; Yang et al , 2012; Li et al , 2019; Wang et al , 2016; Wang et al , 2014; Wu and Guo, 2018; Robinson et al , 2012). Guo and Wu (2018) built a dislocation based physical model, which considered the quench-induced precipitates.…”

Section: Introductionmentioning

confidence: 99%

A modified Arrhenius model for as-quenched Al-Mg-Si alloy considering the effect of cooling rate

Guo

Ren

2020

Self Cite

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Purpose Accurate prediction of residual stress requires precise knowledge of the constitutive behavior of as-quenched material. This study aims to model the flow stress behavior for as-quenched Al-Mg-Si alloy. Design Methodology Approach In the present work, the flow behavior of as-quenched Al-Mg-Si alloy is studied by the hot compression tests at various temperatures (573–723 K), strain rates (0.1–1 s−1) and cooling rates (1–10 K/s). Flow stress behavior is then experimentally observed, and an Arrhenius model is used to predict the flow behavior. However, due to the fact that materials parameters and activation energy do not remain constant, the Arrhenius model has an unsatisfied prediction for the flow behavior. Considering the effects of temperatures, strain rates and cooling rates on constitutive behavior, a revised Arrhenius model is developed to describe the flow stress behavior. Findings The experimental results show that the flow stress increases by the increasing cooling rate, increasing strain state and decreasing temperature. In comparison to the experimental data, the revised Arrhenius model has an excellent prediction for as-quenched Al-Mg-Si alloy. Originality Value With the revised Arrhenius model, the flow behaviors at different quenching conditions can be obtained, which is an essential step to the residual stress prediction when the model is implemented in a finite element code, e.g. ABAQUS, in the future.

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Dislocation density based model for Al-Cu-Mg alloy during quenching with considering the quench-induced precipitates

Cited by 17 publications

References 34 publications

Relationship between the microstructure and properties of a peak aged Cu–Ni–Co–Si alloy

Relationship between the microstructure and properties of a peak aged Cu–Ni–Co–Si alloy

Effect of Cold Pressing and Aging on Reduction and Evolution of Quenched Residual Stress for Al-Zn-Mg-Cu T-Type Rib

A modified Arrhenius model for as-quenched Al-Mg-Si alloy considering the effect of cooling rate

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