A dislocation density-based model considering dynamic strain aging for annealed and water-quenched aluminum alloys under low-temperature conditions

Dong, Fei; Yi, Youping; Huang, Shiquan; Gao, Shenglei; Jia, Yanzhen; Yu, Wenwen

doi:10.1016/j.msea.2022.143916

Cited by 12 publications

(2 citation statements)

References 26 publications

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“…Additionally, DCT accelerates the breaking of unstable grains due to cold compression forces. Both HIP and DCT contribute to grain [29 .…”

Section: Microstructure Of Adct Alloysmentioning

confidence: 99%

Effect of secondary annealing and deep cryogenic treatment on microstructure and mechanical properties of TC27 titanium alloy

Li,

Xiong,

Wang

et al. 2024

Preprint

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This study investigates the effects of annealing and subsequent deep cryogenic treatment (DCT) on the microstructure and mechanical properties of TC27 titanium alloy. The results show that in the annealed alloy, the α(100) crystal plane grows preferentially along with an increased dislocation density. The size of α-phase significantly increases, forming a basketweave structure between the coarse colony laths. For the ADCT (annealed then DCT) sample, the strongest diffraction peak changes from β(110) after 24 hours of low temperature treatment (ADCT24) to α(101) after 36 hours of low temperature treatment (ADCT36). In the optimized ADCT36 sample, there are more needle-like precipitated α' phases, which result from the β phase supersaturated non-equilibrium densely packed hexagonal lattice formed by non-diffusion transformation of α. The tensile strength and elongation of ADCT36 are 1096.7MPa and 5.6%, respectively, and these improvements are attributed to the homogeneous structure, more isometric and finer secondary α phase, grain rotation, and high-density dislocations.

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“…Additionally, DCT accelerates the breaking of unstable grains due to cold compression forces. Both HIP and DCT contribute to grain [29 .…”

Section: Microstructure Of Adct Alloysmentioning

confidence: 99%

Effect of secondary annealing and deep cryogenic treatment on microstructure and mechanical properties of TC27 titanium alloy

Li,

Xiong,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Fan et al [13] studied the influence of deformation temperature on the flow stress of the 2A12 aluminum alloy, and found that after subtracting the structural component, related to grain size, dislocations, and precipitates, from the total flow stress, a bell-shaped flow stress was left in some specific temperature regions, which can be explained well with the dynamic strain aging mechanism. Because the typical dislocation density-based K-M model could not capture the negative strain-rate sensitivity caused by DSA, Dong et al [14] proposed a modified K-M model considering DSA to describe the tensile behavior of alloys, while relevant tests were conducted at low strain rates and the reliability of the model in the wide strain-rate range has not been verified.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

Ma,

Wang,

Huang

et al. 2023

Metals

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The formability at room temperature and low speed limits the application of aluminum alloy, while high strain rates positively improve the formability of materials. The constitutive behaviors of materials under high strain rates or impact loadings are significantly different from those under quasi-static conditions, while few constitutive models consider the effect of the mobile dislocation and forest dislocation evolution on the dynamic strain aging (DSA) over a wide strain-rate range. The 5052 aluminum alloy, of which the primary source of strain-hardening is dislocation–dislocation interaction, is widely used in manufacturing automotive covering parts and is considered one of the most promising alloys. Therefore, this study conducts uniaxial tensile tests on AA5052-O under conditions of temperatures ranging from 293 K to 473 K and strain rates ranging from 0.001 s−1 to 3000 s−1, and compares the stress–strain relationships of AA5052-O under different conditions to illustrate the constitutive relationship affected by the dislocation evolution over a wide strain-rate range. The Arrhenius model based on the thermal activation mechanism is modified and extended by considering the effects of dynamic strain aging (DSA), drag stress, and the evolution of mobile dislocation and forest dislocation. Thus, a new physics-based constitutive model for AA5052-O is proposed, which can well reflect the change in strain-rate sensitivity with the strain rate increasing. The mobile dislocation density and total dislocation density are predicted with a modified Kubin–Estrin (KE) model, and the influences of variable mobile dislocation on DSA and dislocation drag are discussed as well. In order to verify the reliability of the new constitutive model, the dislocation densities of the specimens before and after deformation are obtained with TEM and XRD, which are in good agreement with the predicted values. This study also compares the newly proposed model with classic constitutive models using multiple statistical evaluation methods, which shows that the new physics-based constitutive model has not only more clear physical meanings for its parameters but also has a higher prediction accuracy.

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7075 aluminum alloy induced by ultrasonic surface rolling: grain refinement and residual stress model analysis and evaluation

Zheng,

Jia,

Shang

et al. 2023

Int J Adv Manuf Technol

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A dislocation density-based model considering dynamic strain aging for annealed and water-quenched aluminum alloys under low-temperature conditions

Cited by 12 publications

References 26 publications

Effect of secondary annealing and deep cryogenic treatment on microstructure and mechanical properties of TC27 titanium alloy

Effect of secondary annealing and deep cryogenic treatment on microstructure and mechanical properties of TC27 titanium alloy

Study on the Flow Behavior of 5052 Aluminum Alloy over a Wide Strain-Rate Range with a Constitutive Model Based on the Arrhenius Model Extension

7075 aluminum alloy induced by ultrasonic surface rolling: grain refinement and residual stress model analysis and evaluation

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