Effects of cryorolling, room temperature rolling and aging treatment on mechanical and corrosion properties of 7050 aluminum alloy

Xiong, Hanqing; Zhou, Yuexin; Yang, Ping; Kong, Charlie; Yu, Hailiang

doi:10.1016/j.msea.2022.143764

Cited by 23 publications

(3 citation statements)

References 55 publications

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“…Microstructure evolution of the near-surface region, including the feature of the grains, the density, dimension and distribution of precipitates, as well as the density and distribution of dislocations directly influence the corrosion behavior of the alloy. Generally, corrosion preferentially occurs in the locations with high energy [ 31 , 32 , 33 , 34 ], such as the locations with high density of dislocations.…”

Section: Discussionmentioning

confidence: 99%

Microstructure Evolution of the Near-Surface Deformed Layer and Corrosion Behavior of Hot Rolled AA7050 Aluminum Alloy

Liu,

Pan,

Liu

et al. 2023

Materials

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The current study investigates the influence of hot rolling on the microstructure evolution of the near-surface region on AA7050 aluminum alloy and the corrosion performance of the alloy. It is revealed that hot rolling resulted in grain refinement in the near-surface region, caused by dynamic recrystallization, and equiaxed grains less than 500 nm can be clearly observed. Fibrous grains were evident in the hot rolled AA7050 aluminum alloy with relatively lower rolling temperature or larger rolling reduction, caused by the more severe elemental segregation at grain boundaries, which inhibited the progression of dynamic recrystallization. The density of the precipitates in the fibrous grain layer was higher, compared with those in the equiaxed grain layer, due to the increased dislocation density, combined with more severe elemental segregation, which significantly promoted the nucleation of precipitates. With the co-influence exerted by low density of precipitates and dislocations on the improvement of the corrosion performance of the alloy, the rolled AA7050 alloy with decreased density of precipitates and dislocations exhibited better corrosion resistance.

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Section: Discussionmentioning

confidence: 99%

Microstructure Evolution of the Near-Surface Deformed Layer and Corrosion Behavior of Hot Rolled AA7050 Aluminum Alloy

Liu,

Pan,

Liu

et al. 2023

Materials

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“…Furthermore, CR promotes the homogeneous distribution of secondary phases, further enhancing mechanical properties. Consequently, CR is recognized as an effective method for achieving a desirable balance between hardness, strength, and elongation in Al alloys [50,51]. Notably, cryorolled 7XXX alloys exhibit surprisingly high deformability even at large rolling reductions [46,49,51], making them particularly attractive for various applications.…”

Section: Introductionmentioning

confidence: 99%

Sustainability through Optimal Compositional and Thermomechanical Design for the Al-7XXX Alloys: An ANOVA Case Study

Ijaz,

Nashri,

Qamash

2024

Sustainability

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The quest for lightweight, high-performance structural materials for demanding applications such as in the fields of automotive, aerospace, and other high-tech and military industries pushes the boundaries of material science. The present work aims to draw attention to a novel, sustainable manufacturing approach for the development of next-generation 7xxx series aluminum alloys that have higher strength by rejuvenating a sustainable compositional and thermomechanical processing strategy. Our innovative strategy integrates two key synergies: trace hafnium (Hf) addition for microstructural refinement, unique thermomechanical treatment involving cryorolling, and a short annealing method. Experimental results revealed that our base alloy exhibited a 33 µm grain size and impressive initial mechanical properties (334 MPa UTS, 150 HV). Adding 0.6 wt.% Hf and employing 50% cryorolling with short annealing led to a remarkable 10 µm grain size reduction and significant mechanical property leaps. The resulting alloy boasts a 452 MPa UTS and 174 HV, showcasing the synergistic advantageous effect of Hf and cryorolling plus annealing treatment. The developed alloys were compositional- and work hardening-dependent, leading to a rich mix of strengthening mechanisms. Optical and scanning electron microscopy reveal several intermetallic phases within the fcc matrix, wherein the Al3Hf phase plays a key role in strengthening by impeding dislocation movement. In addition to experimental results, a 12-full-factorial design experiment via ANOVA analysis was also utilized to validate the significant influence of Hf and cryorolling on properties with (p-values < 0.05). Among the different parameters, cryorolling plus annealing appeared as the most noteworthy factor, followed by the composition. Using the regression model, the ultimate tensile strength and hardness were predicted to be 626 MPa UTS and 192 HV for an alloy with 0.6 wt.% Hf and 85% cryorolling, which opens a new avenue for ultra-high-strength Al7xxx alloys.

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“…After solution treatment and cold deformation, the tensile strength of Al 7050 alloy increased by more than 20% after peak aging [15]. Significant improvement of mechanical properties is obtained at a larger strain or lower aging temperature [16], because high-density dislocations promoted the nucleation of η′ precipitates during peak aging; higher-density η′ precipitates are thus formed.…”

Section: Introductionmentioning

confidence: 99%

Effect of precipitates evolution on mechanical properties of Al 7050 alloy during secondary aging

Wang

Ren

et al. 2023

Mater. Res. Express

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The microstructure and mechanical properties were investigated in Al 7050 alloy after aging treatments. Results showed that refining the η′ precipitates and increasing the proportion of the η′ precipitates significantly improved its mechanical properties. High density dislocations created by cold deformation promoted the nucleation of the main strengthening η′ phase during aging. High-density fine precipitates was created, which increases the yield strength. However, the strength of the deformed sample decreased by ~31.6 % after the secondary aging at 157 °C, with more degradation than other samples. Microstructure study presented that some precipitates were composed of two distinctive areas. An in-situ transformation from a simple triclinic Mg2Zn3 to the η phase (MgZn2) was observed during the secondary aging. The loss in strength after secondary aging at 157 °C proved that the η′ precipitates transformed into the η precipitates by absorbing solute atoms at a temperature lower than equilibrium precipitation temperature of η precipitates. The residual high-density dislocations in the cold-deformed samples promoted the diffusion of solute atoms, which accelerated the η′→η transformation during the secondary aging. Significant reduction in the volume of η′ precipitations led to the rapid deterioration of mechanical properties.

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Effects of cryorolling, room temperature rolling and aging treatment on mechanical and corrosion properties of 7050 aluminum alloy

Cited by 23 publications

References 55 publications

Microstructure Evolution of the Near-Surface Deformed Layer and Corrosion Behavior of Hot Rolled AA7050 Aluminum Alloy

Microstructure Evolution of the Near-Surface Deformed Layer and Corrosion Behavior of Hot Rolled AA7050 Aluminum Alloy

Sustainability through Optimal Compositional and Thermomechanical Design for the Al-7XXX Alloys: An ANOVA Case Study

Effect of precipitates evolution on mechanical properties of Al 7050 alloy during secondary aging

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