Influence of High-Pressure Torsion and Accumulative High-Pressure Torsion on Microstructure and Properties of Zr-Based Bulk Metallic Glass Vit105

Гундеров, Д. В.; Astanin, V. V.; Churakova, Anna; Ситдиков, В. Д.; Ubyivovk, E. V.; Islamov, Akhmed; Wang, Jing Tao

doi:10.3390/met10111433

Cited by 16 publications

(9 citation statements)

References 54 publications

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“…Amorphous Al-Ni-Y and Al-Ni-La alloys are typical representatives of a group of light high-strength materials from the Al-TM-RE group (TM—transition metal, RE—Y, Yb, La, Gd) [ 2 , 6 , 13 , 14 , 21 , 34 , 37 ]; amorphous Fe 77 Si 13 B 10 alloy is a high-induction amorphous magnetic material that serves as the basis for Finemet-type nanocrystalline materials and belongs to the group of the most widely studied ferromagnetic amorphous alloys [ 4 , 11 , 12 , 18 , 36 ]. Amorphous Zr 62.5 Cu 22.5 Al 10 Fe 5 alloy refers to the most common alloys that can be obtained as a bulk metallic glass [ 7 , 26 , 27 , 28 , 29 , 38 ].…”

Section: Methodsmentioning

confidence: 99%

“…The heterogeneous amorphous structure formed during heat treatment is due to the inhomogeneous distribution of alloy components. These changes can also occur during the deformation of amorphous alloys [ 26 , 27 , 28 , 29 , 30 ]; however, the most significant changes in the structure are due to the formation of shear bands. Previously, it was found that deformation in amorphous alloys occurred through strongly localized plastic strain in shear bands [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ].…”

Section: Introductionmentioning

confidence: 99%

“…A lot of studies [ 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ] have been devoted to investigation of the effect of free volume on the structure and properties of a material, and, at present, the concept of free volume is widely used to explain the various properties of metallic glasses. To determine a change in the amount of free volume under various effects on the structure, the method of X-ray diffraction is used most often [ 28 , 49 , 52 ]. A shift in the position of the main diffuse maximum in X-ray patterns due to heat treatment or deformation means a change in the mean nearest neighbor distance in the amorphous phase, which characterizes a decrease or increase in the free volume fraction in the structure.…”

Section: Introductionmentioning

confidence: 99%

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Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling

et al. 2023

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X-ray diffraction and scanning electron microscopy were used to study changes in the structure of amorphous alloys under deformation by high-pressure torsion and multiple rolling. The change in mean nearest neighbor distance (the radius of the first coordination sphere) under deformation was determined. During deformation, shear bands are formed in amorphous alloys, which are regions of lower density compared to the surrounding undeformed amorphous matrix. Shear bands are zones of increased free volume, in which crystallization processes are facilitated. The change in the proportion of free volume under deformation of various types was estimated. The formation of shear bands leads to the appearance of steps on the surface of the samples. The number of shear bands and the surface morphology of deformed amorphous alloys were determined by the type of deformation and the physical properties of the material. The results obtained are discussed within the concept of free volume in the amorphous phase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling

et al. 2023

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“…The application of the high shear strain supports the tendency of the processed material to form localized shear bands. Nevertheless, this tendency is compensated by the applied (very) high pressure, which contributes to structure homogenization [38,39]. By the effect of these phenomena, high pressure torsion imparts substantial grain fragmentation and substructure development (depending on the total imposed strain).…”

Section: Introductionmentioning

confidence: 99%

Correlation of structure development and electric characteristics within high pressure torsion processed copper

Kocich,

Kopeček,

Marek

2024

Materialwissenschaft Werkst

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Copper of a high purity features excellent electric conductivity, but generally very low mechanical properties. Nevertheless, optimized deformation/thermomechanical treatment can introduce favorable combinations of both. The presented study characterizes the correlation of microstructure development and electric properties within copper processed by the severe plastic deformation method of high pressure torsion, the primary advantage of which is that it enables to achieve grains with the sizes in the ultra‐fine, or even nano scales. The study investigates structure development during progressive deformation. In other words, samples processed by single and double high pressure torsion revolutions were evaluated from the viewpoints of grain sizes and grain boundaries, and the results were correlated with the experimentally measured electric conductivity. The single high pressure torsion revolution contributed to grain size decrease, while the structure after double revolution exhibited very fine grains, especially at the sample periphery featuring the highest imposed strain. Both the samples also exhibited increases in microhardness (especially after double revolution), and electric conductivity higher than 100 % IACS. The results confirmed that copper conductors featuring enhanced mechanical properties and favorable electric conductivity can be manufactured by severe plastic deformation.

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“…Furthermore, a new method was proposed in [20]-accumulative high-pressure torsion (ACC HPT) deformation to achieve high strains in hard and hardened materials. ACC HPT was applied and proved its efficiency on bulk metallic glass [20,21], and there is one paper where ACC HPT is applied to crystalline metallic materials [22], but it has not been applied to Zr and its alloys. Further to this, a new method was proposed in [20]-accumulative high-pressure torsion (ACC HPT) deformation to achieve high strains in hard and hardened materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of HPT and Accumulative High-Pressure Torsion on the Structure and Hv of a Zirconium Alloy

Гундеров

Stotskiy

Lebedev

et al. 2021

Metals

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The authors previously used the accumulative high-pressure torsion (ACC HPT) method for the first time on steel 316, β-Ti alloy, and bulk metallic glass vit105. On low-alloyed alloys, in particular, the zirconium alloy Zr-1%Nb, the new method was not used. This alloy has a tendency to α → ω phase transformations at using simple HPT. When using ACC HPT, the α → ω transformation can be influenced to a greater extent. This article studies the sliding effect and accumulation of shear strain in Zr-1%Nb alloy at various stages of high-pressure torsion (HPT). The degree of shear deformation at different stages of HPT was estimated. The influence of various high-pressure torsion conditions on the micro-hardness and phase composition by X-ray diffraction (XRD) of Zr-1%Nb was analyzed. It is shown that at high-pressure torsion revolutions of n = 2, anvils and the specimen significantly slip, which is a result of material strengthening. It was found that despite sliding, regular high-pressure torsion resulted in the high strengthening of Zr-1%Nb alloy (micro-hardness more than doubled), and after high-pressure torsion n = 10, up to 97% of the high-pressure ω-phase was formed in it (as in papers of other researchers). Accumulative high-pressure torsion deformation leads to the strongest transformation of the Zr-1%Nb structure and Hv and, therefore, to a higher real strain of the material due to composition by upsetting and torsion in strain cycles.

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Influence of High-Pressure Torsion and Accumulative High-Pressure Torsion on Microstructure and Properties of Zr-Based Bulk Metallic Glass Vit105

Cited by 16 publications

References 54 publications

Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling

Changes in the Structure of Amorphous Alloys under Deformation by High-Pressure Torsion and Multiple Rolling

Correlation of structure development and electric characteristics within high pressure torsion processed copper

Influence of HPT and Accumulative High-Pressure Torsion on the Structure and Hv of a Zirconium Alloy

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