Strain rate effect on the cyclic deformation response of UFG Al alloys

Malekjani, Shokoufeh; Hodgson, Peter; Čížek, Pavel; Hilditch, Tim

doi:10.1016/j.msea.2012.03.085

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…Pure UFG metals, even at room temperature (RT), are prone to cyclic softening induced by grain growth. Such grain growth can occur inside localized shear bands, as observed for UFG Al [10,13], or UFG Cu [14], around micro-cracks [15], from unrefined grains, or any pre-existing inhomogeneity [16,17]. However, An et al [18] and Zhang et al [15] have shown the beneficial effect of an increased Al or Zn content on the cyclic stability and fatigue performance of UFG copper alloys, while Canadinc et al [5] have shown that solute Mg, which restricts dislocations mobility and recovery processes, promotes cyclic stability in UFG Al-Mg alloys.…”

Section: Introductionmentioning

confidence: 71%

Ultrafine versus coarse grained Al 5083 alloys: From low-cycle to very-high-cycle fatigue

Meng

Goyal

Doquet

et al. 2019

International Journal of Fatigue

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A B S T R A C TThe fatigue performance of coarse and ultrafine-grained (UFG) 5083 Al alloy were compared, from low to very high cycle fatigue. The UFG alloy exhibited cyclic hardening and predominant kinematic hardening. At high plastic strain amplitude (and only in this regime), it showed easier crack initiation and a lower fatigue resistance. Its resistance to HCF was hardly better than that of its coarse grained counterpart until 2.10 6 cycles, but 43% higher in VHCF, until 5.10 8 cycles. Beyond that point, internal crack initiation occurred, and the fatigue resistance of the UFG material decreased, which was explained using Fracture Mechanics.

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Section: Introductionmentioning

confidence: 71%

Ultrafine versus coarse grained Al 5083 alloys: From low-cycle to very-high-cycle fatigue

Meng

Goyal

Doquet

et al. 2019

International Journal of Fatigue

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“…As mentioned earlier, the microstructures are considered to show high compressive yield strength at room temperature because of as-sprayed structures with high internal energy (high dislocation density) and sub-micronsized grains. In addition, metal materials that generally show metallic materials with high dislocation densities are known to exhibit low strain rate sensitivity, 14,15) and materials manufactured through kinetic spray processes can be considered to show low strain rate sensitivity because they already have quite even and large hardened structures.…”

Section: Effect Of Stain Rate On Microstructure Evolution and Compresmentioning

confidence: 99%

Effect of Stain Rate on Microstructure Evolution and Compressive Deformation Behavior of High-Strength Aluminum Coating Materials Fabricated by the Kinetic Spray Process

Kim

Lee

Huh³

et al. 2015

Mater. Trans.

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The effects of strain rates on compressive deformation behavior and microstructure evolution of kinetic sprayed pure aluminum were investigated. The initial microstructure showed a highly deformed structure with high-dislocation density. This material exhibited higher yield strengths from 200 to 224 MPa with different strain rates and low strain rate sensitivity (0.012) compared to those of conventional pure aluminum. Strain softening occurred at lower strain rates, even at room temperature, and strain hardening at high strain rates.

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“…Studies on the influence of the strain rate on the mechanical and structural properties are mainly carried out on previously deformed materials or on coarse-crystalline materials using standard static or dynamic tests. Such studies have been carried out for many materials, mainly after the ECAP process, such as magnesium alloys, aluminum alloys or titanium, but also after ARB (accumulative roll-bonding) or cold rolling processes [ 10 , 11 , 12 , 13 , 14 ]. In the case of zinc, such work was carried out in dynamic compression tests, where the leading role of the continuous dynamic recrystallization process at higher compression rates (~0.5 s −1 ) was observed [ 1 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain Rates during Severe Plastic Strain Processes on Microstructural and Mechanical Evolution in Pure Zinc

et al. 2022

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The study presents an analysis of the influence of the plastic strain rate on the mechanical and structural properties of pure zinc. Thanks to the use of unconventional methods of plastic processing, the process of the equal channel angular pressing (ECAP) and the process of hydrostatic extrusion (HE), the tests were performed in a wide range of plastic strain rates, between 0.04 s−1 and 170 s−1. Plastic strain rate changes were carried out in the course of the significant plastic strain processes, and not on previously deformed samples. All tests were carried out at a constant value of plastic strain rate, ε ~ 2. A strong influence of the plastic strain rate on changes in the microstructure in zinc was observed during the tests. For the rates in the range of 0.04 s−1 to 0.53 s−1 its bimodal nature was observed, and in the range of 7 s−1 to 170 s−1 high homogeneity and evenness of grains related to the processes of continuous dynamic recrystallization was noticed. The effect of the strong homogenization of the microstructure was the increase in mechanical properties, yield point and tensile strength to the maximum values of UTS = 194 MPa, YS = 145 MPa at a strain rate of 170 s−1. Compared to the material with a bimodal microstructure, an over seven-fold increase in the elongation value was observed.

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Strain rate effect on the cyclic deformation response of UFG Al alloys

Cited by 7 publications

References 23 publications

Ultrafine versus coarse grained Al 5083 alloys: From low-cycle to very-high-cycle fatigue

Ultrafine versus coarse grained Al 5083 alloys: From low-cycle to very-high-cycle fatigue

Effect of Stain Rate on Microstructure Evolution and Compressive Deformation Behavior of High-Strength Aluminum Coating Materials Fabricated by the Kinetic Spray Process

Influence of Strain Rates during Severe Plastic Strain Processes on Microstructural and Mechanical Evolution in Pure Zinc

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