Mechanical properties of rolled and aged AA6061 sheets at room-temperature and cryogenic environments

Liu, Yue; Zhao, Xinling; Li, Jing; Bhatta, Laxman; Luo, Kaiguang; Kong, Charlie; Yu, Huimin

doi:10.1016/j.jallcom.2020.158449

Cited by 36 publications

(3 citation statements)

References 57 publications

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“…As known, high misorientation grain boundaries (15°) may act as an effective dislocation barrier, impeding the movement of mobile dislocations from one crystal to its neighbor. This leads to the enhancement of the material strength during plastic deformation [59,60]. The finer the grains, the greater the grain boundaries per unit area; as a result, the effect of strengthening will be more evident.…”

Section: Resultsmentioning

confidence: 99%

Microstructure evolution, texture development, and mechanical properties of hot-rolled 5052 aluminum alloy followed by annealing

Wu¹,

Djavanroodi²,

Göde³

et al. 2022

Mater. Res. Express

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Aluminum alloys, especially the 5000 series, have drawn the attention of the transportation industry due to their lightweight and consequently reduced fuel consumption. In this regard, one of the major problems of this alloy is its low strength and ductility that can be solved using rolling and post-annealing. Accordingly, the present study concentrates on this issue. Microstructural images showed that the rolling process develops a lot of tangled and trapped dislocations in the sample, which gradually lead to the formation of dislocation bundles and networks. Subsequent annealing can produce a more homogeneous structure with clear grain boundaries and low dislocation density in the inner region of the grains. However, grain refinement efficiency through rolling is retained even after annealing. Initial and rolled Al5052 with the maximum intensity of 2.87 and 6.33 possess the lowest and highest overall texture. Also, post-annealing decreases the texture intensity to 6.33 and 4.87 at 150 and 200 °C, respectively. In this context, deformation texture components strengthen considerably after the rolling process due to the formation of shear bands, and they slightly weaken during heat treatment. Although the initial annealing of the as-received material does not cause discontinuous recrystallization during rolling, it may facilitate the material recovery before rolling. Post-annealing was found to decrease the improved effect of strength by rolling and increase the negative influence of ductility due to the inhibition of dislocation strengthening. The results showed that both dislocation density and the precipitation of Mg atoms are influential for electrical resistivity.

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Section: Resultsmentioning

confidence: 99%

Microstructure evolution, texture development, and mechanical properties of hot-rolled 5052 aluminum alloy followed by annealing

Wu¹,

Djavanroodi²,

Göde³

et al. 2022

Mater. Res. Express

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“…As shown in Figure 6a,d, a large number of dimples were observed in the tensile fracture of HEAp/AMCs obtained by different rolling processes. At room temperature, a small number of dimples with a large individual area was presented in the fracture surface [32]. However, a larger density of smaller dimples was observed in CR HEAp/AMCs, indicating a good elongation.…”

Section: Microstructure Analysis Of Heap/amcsmentioning

confidence: 95%

Study on Mechanical Properties and Microstructure of FeCoCrNi/Al Composites via Cryorolling

Luo

Zhang

et al. 2022

Metals

Self Cite

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Aluminum matrix composites (AMCs) reinforced by 1.5 and 3 wt% FeCoCrNi high-entropy alloy particles (HEAp) were obtained by a stir casting process. The AMCs strip was further prepared by room temperature rolling (RTR, 298 K) and cryorolling (CR, 77 K). The mechanical properties of the AMCs produced by RTR and CR were studied. The effect of a microstructure on mechanical properties of composites was analyzed by scanning electron microscopy (SEM). The results show that CR can greatly improve the mechanical properties of the HEAp/AMCs. Under 30% rolling reduction, the ultimate tensile strength (UTS) of the RTR 1.5 wt% HEAp/AMCs was 120.3 MPa, but it increased to 139.7 MPa in CR composites. Due to the volume shrinkage effect, the bonding ability of CR HEAp/AMCs reinforcement with Al matrix was stronger, exhibiting higher mechanical properties.

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“…In addition, the HEAp/AMCs could accumulate a large amount of stored energy with a high density of dislocations in cryogenic environment, enabling grain refinement during ACR [22,23]. The phenomenon of dynamic recovery of AMCs because heat generation during AR will not occur [24,25]. Therefore, ACR can form high-density dislocations and substructures in the HEAp/AMCs, which improves the comprehensive mechanical properties of the HEAp/AMCs [26].…”

Section: Microstructure Analysismentioning

confidence: 99%

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

Luo

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The lightweight of structural materials was an important research focus for reduced energy consumption and transport efficiency. Aluminium matrix composites (AMCs) had the advantages of high specific strength and good wear resistance, so they were widely used in automobile, aerospace and other fields. At present, the deformation mechanism of AMCs reinforced by high-entropy alloy particles (HEAp) in asymmetric rolling was not clear. In this work, AMCs ingot reinforced with 6 wt% HEAp was prepared by stir casting process. Then the mechanical properties of HEAp/AMCs under different rolling processes were studied by asymmetric rolling (AR) and asymmetric cryorolling (ACR) processes. High-entropy alloy (HEA) had excellent strength and toughness, which imparted good deformation ability when added to AMCs as reinforcement. The microstructure of AMCs reinforced by HEAp was refined by ACR. At the same time, the HEAp/AMCs obtained by ACR displayed a higher ultimate tensile strength (UTS) than that obtained by AR. The study of ACR shows that AMCs reinforced with HEAp have good toughness. ACR can reduce the thickness of HEAp/AMCs to a greater extent so as to produce AMCs strip with excellent mechanical properties.

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Mechanical properties of rolled and aged AA6061 sheets at room-temperature and cryogenic environments

Cited by 36 publications

References 57 publications

Microstructure evolution, texture development, and mechanical properties of hot-rolled 5052 aluminum alloy followed by annealing

Microstructure evolution, texture development, and mechanical properties of hot-rolled 5052 aluminum alloy followed by annealing

Study on Mechanical Properties and Microstructure of FeCoCrNi/Al Composites via Cryorolling

Effect of asymmetric rolling on microstructure and mechanical properties of aluminum matrix composites

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