Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Lunev, A. G.; Nadezhkin, M. V.; Баранникова, С. А.; Зуев, Л. Б.

doi:10.12693/aphyspola.134.342

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…where δV S is the change in the speed of ultrasound, (σ 2 − σ 1 ) is the difference between the principal stresses, and ρ is the density of the material. This relationship was verified and confirmed in numerous works [36,37]. The value of δV S at any structural changes does not exceed 1 .…”

Section: Methodssupporting

confidence: 75%

“…In this situation, indirect methods seem to be more suitable for assessing the stress state through some informative quantities whose correlation with macroscopic residual stresses has a clear physical nature. In that regard, measuring the velocity of ultrasound is especially convenient [36,37], since it depends on the internal stresses in the material. The method is based on the experimentally established dependence of the ultrasound propagation velocity V S on macro-stresses.…”

Section: Resultsmentioning

confidence: 99%

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Autowave Criteria of Fracture and Plastic Strain Localization of Zirconium Alloys

Зуев

Баранникова

Орлова

2022

Metals

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Plastic deformation and fracture of Zr–1% Nb alloys exposed to quasi-static tensile testing have been studied via a joint analysis of stress-strain curves, ultrasound velocity and double-exposure speckle photographs. The possibilities of ductility evaluation through the εxx strain distribution in thin-walled parts of zirconium alloys are shown in this paper. The stress-strain state of zirconium alloys in a cold rolling site is investigated considering the development of localized deformation bands and changes in ultrasound velocity. It is established that the transition from the upsetting to the reduction region is accompanied by the significant exhaustion of the plasticity margin of the material; therefore, the latter is more prone to fracture in this zone exactly. It is shown that traditional methods estimating the plasticity margin from the mechanical properties cannot reveal this region, requiring a comprehensive study of macroscopically localized plastic strain in combination with acoustic measurements. In particular, the multi-pass cold rolling of Zr alloys includes various localized deformation processes that can result in the formation of localized plasticity autowaves. Recommendations for strain distribution division over the deformation zone length in the alloy in the pilger roll grooves are provided as well.

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Section: Methodssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Autowave Criteria of Fracture and Plastic Strain Localization of Zirconium Alloys

Зуев

Баранникова

Орлова

2022

Metals

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“…Typical flow serrations, which are specific signs of the PLC effect, appear. The PLC band generation generally is the result of the dislocation assembly motion and dislocation forest formation [ 51 ]. Here, this effect could be explained in terms of superposing the monotonically increasing stresses generated by the compressive deformation with the much smaller fluctuating stresses generated by the ultrasonic oscillations.…”

Section: Resultsmentioning

confidence: 99%

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

et al. 2021

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To date, numerous investigations have shown the beneficial effect of ultrasonic vibration-assisted forming technology due to its influence on the forming load, flow stress, friction condition reduction and the increase of the metal forming limit. Although the immediate occurring force and mean stress reduction are known phenomena, the underlying effects of ultrasonic-based material softening remain an object of current research. Therefore, in this article, we investigate the effect of upsetting with and without the ultrasonic vibrations (USV) on the evolution of the microstructure, stress relaxation and hardness of the AlMg3 aluminum alloy. To understand the process physics, after the UAC (ultrasonic assisted compression), the microstructures of the samples were analyzed by light and electron microscopy, including the orientation imaging via electron backscatter diffraction. According to the test result, it is found that ultrasonic vibration can reduce flow stress during the ultrasonic-assisted compression (UAC) process for the investigated aluminum–magnesium alloy due to the acoustic softening effect. By comparing the microstructures of samples compressed with and without simultaneous application of ultrasonic vibrations, the enhanced shear banding and grain rotation were found to be responsible for grain refinement enhancement. The coupled action of the ultrasonic vibrations and plastic deformation decreased the grains of AlMg3 alloy from ~270 μm to ~1.52 μm, which has resulted in a hardness enhancement of UAC processed sample to about 117 HV.

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“…The elastic-plastic invariant necessitates the allowance for the role played by elastic (lattice) characteristics of materials and is important in the development of models [22][23][24][25][26][27][28][29][30][31][32] and mechanisms of evolution of a plastic flow [33][34][35][36][37][38][39][40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Localized Plastic Deformation and Periodic Table

Зуев¹

2020

GEOMATE

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We consider the autowave mechanism of evolution of a localized plastic deformation of crystalline solids of different origins. It is found that localization of the plastic flow is determined by the relation between elastic and plastic phenomena in deforming materials. The origin of this relation is explained using general thermodynamic concepts. It is shown that parameters of plastic flow localization at the stage of linear strain hardening in the process of solid body deformation are closely related to characteristics of the electronic structure of metals. Inverse of the product of wavelength and velocity of the localized plasticity autowave grows linearly with the number of conduction electrons per unit cell of the metal. The obtained data directly indicate that the nature of the electron-gas contribution to hindering of dislocations is more complicated. Thus, the parameters of plastic flow localization are defined by the position of metal in the Mendeleev periodic table.

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Acoustic Parameters as Criteria of Localized Deformation in Aluminum Alloys

Cited by 16 publications

References 24 publications

Autowave Criteria of Fracture and Plastic Strain Localization of Zirconium Alloys

Autowave Criteria of Fracture and Plastic Strain Localization of Zirconium Alloys

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

Localized Plastic Deformation and Periodic Table

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