Change in characteristics of superplastic deformation of the aluminum–lithium alloy under the effect of ultrasonic vibrations

Myshlyaev, М. M.; Шпейзман, В. В.; Klubovich, V. V.; Кулак, М. М.; Lyu, G.

doi:10.1134/s1063783415100236

Cited by 11 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To this end, crosshead velocity abruptly changed from 10 to 5 mm/min and vice versa during the tensile tests. To enhance material ductility, the tensile tests were assisted by ultrasonic vibrations with frequency of 20 kHz and amplitude of 5 lm by using in-house acoustic system [9].…”

Section: Methodsmentioning

confidence: 99%

EBSD study of superplastically strained Al-Mg-Li alloy

et al. 2020

View full text Add to dashboard Cite

In this study, electron back scatter diffraction (EBSD) was employed to examine the microstructure evolved during superplastic deformation of advanced Al-Mg-Li alloy. In contrast to the widelyaccepted conception of superplasticity, the microstructure was found to be characterized by elongated grains, a notable fraction of low-angle boundaries, and a distinct (though a very weak) crystallographic texture. All these observations suggested a significant activity of intragranular slip.

show abstract

Section: Methodsmentioning

confidence: 99%

EBSD study of superplastically strained Al-Mg-Li alloy

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Prior to each experiment, the test specimen was held at temperature for 10 min to attain thermal equilibrium. Furthermore, to enhance ductility, tensile straining was assisted by imposing ultrasonic vibration at a frequency of 20 kHz and amplitude of 5 µm by using inhouse acoustic system [67]. As shown by Myshlyaev, et al [67], this approach provided an ~60-pct.…”

Section: Materials and Proceduresmentioning

confidence: 99%

“…Furthermore, to enhance ductility, tensile straining was assisted by imposing ultrasonic vibration at a frequency of 20 kHz and amplitude of 5 µm by using inhouse acoustic system [67]. As shown by Myshlyaev, et al [67], this approach provided an ~60-pct. increase in elongation-to-failure due to the enhancement of diffusion-driven processes.…”

Section: Materials and Proceduresmentioning

confidence: 99%

EBSD study of superplasticity: New insight into a well-known phenomenon

Myshlyaev

Mironov

Korznikova

et al. 2022

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Широко известны, например, методы упрочнения кристаллических материалов путем поверхностной об-работки ультразвуком [1,2]. Другим примером являет-ся повышение пластичности материалов при их дефор-мировании с наложением высокочастотных колебаний, что позволяет значительно снизить требуемые усилия и энергозатраты в процессе обработки металлов дав-лением, в частности, в условиях сверхпластической де-формации [3]. С помощью ультразвука также возможно ускорение некоторых процессов в металлах, например, фазовых превращений [4] и эффекта памяти формы в сплавах Ti-Ni [5].…”

Section: Introductionunclassified

Effect of ultrasonic treatment on the structure and microhardness of ultrafine grained nickel processed by high pressure torsion

Mukhametgalina¹,

Samigullina²,

Sergeyev³

et al. 2017

LoM

View full text Add to dashboard Cite

Effect of ultrasonic treatment (UST) on the microstructure and microhardness of ultrafine grained nickel processed by high pressure torsion (HPT) was studied. With this aim, samples after HPT were subjected to oscillating compression-tension stresses with amplitudes 15, 30, 45, 60 and 90 MPa in the zone of strain antinode of an ultrasonic instrument. The microstructure of initial and ultrasonically treated samples was studied by X-ray diffraction analysis, transmission electron microscopy and electron back-scatter diffraction (EBSD). Dependences of average dislocation density, internal strains and microhardness on the ultrasound amplitude were obtained. At lower amplitudes (15, 30 MPa) UST leads to some increase of microhardness, internal stresses and dislocation density. At amplitude 60 MPa a considerable reduction of all mentioned characteristics as compared to the initial state occurs, while with a further increase of the amplitude to 90 MPa they exhibit a back increase. An increase of the fraction of high-angle boundaries without a significant change in the average grain size also occurs after UST. The regularities observed are explained as follows. With an increase of ultrasound amplitude, generation and accumulation of dislocations in the grains occur first. Then the processes of their passing through grain boundaries and rearrangement are activated that results in an increase of misorientations of the grains, more effective screening of dislocation stress fields and stress relaxation. With further increase of the stress amplitude processes of generation and accumulation of dislocations prevails over the processes of their annihilation and rearrangement, so that the relaxation effect weakens and diminishes.

show abstract

Change in characteristics of superplastic deformation of the aluminum–lithium alloy under the effect of ultrasonic vibrations

Cited by 11 publications

References 6 publications

EBSD study of superplastically strained Al-Mg-Li alloy

EBSD study of superplastically strained Al-Mg-Li alloy

EBSD study of superplasticity: New insight into a well-known phenomenon

Effect of ultrasonic treatment on the structure and microhardness of ultrafine grained nickel processed by high pressure torsion

Contact Info

Product

Resources

About