scholarly journals The Enrichment of (Cu, Sn) Solid Solution Driven by High-Pressure Torsion

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 766
Author(s):  
Boris Straumal ◽  
Askar Kilmametov ◽  
Anna Korneva ◽  
Pawel Zięba ◽  
Yuri Zavorotnev ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Theoretical Analysis ◽  
Annealing Temperature ◽  
High Pressure Torsion

Cu–14 wt% Sn alloy was annealed at temperatures of 320 and 500 °C. The concentration of tin cinit in the copper-based matrix increased with annealing temperature. The annealed samples were subjected to high-pressure torsion (HPT) at 6 GPa, 5 turns, 1 rpa. HPT led to the refinement of Cu grains. The shape of the colonies of α + ε phases changed only slightly. The HPT-driven enrichment of the Cu-based solid solution with Sn atoms cHPT–cinit decreased with increasing cinit. The performed theoretical analysis explained this behavior of the HPT-driven enrichment.

The enrichment of solid solution in a two-phase alloy during the high pressure torsion

2021 ◽  
pp. 130386
Author(s):  
Anna Korneva ◽  
Askar Kilmametov ◽  
Yuri Zavorotnev ◽  
Leonid Metlov ◽  
Olga Popova ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Two Phase

Thermal Stability of Ultrafine-Grained Pure Titanium Processed by High-Pressure Torsion

2021 ◽  
Vol 1016 ◽  
pp. 338-344
Author(s):  
Wan Ji Chen ◽  
Jie Xu ◽  
De Tong Liu ◽  
De Bin Shan ◽  
Bin Guo ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Grain Size ◽  
High Pressure ◽  
Annealing Temperature ◽  
High Pressure Torsion ◽  
Stored Energy ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Thermal Stability Of

High-pressure torsion (HPT) was conducted under 6.0 GPa on commercial purity titanium up to 10 turns. An ultrafine-grained (UFG) pure Ti with an average grain size of ~96 nm was obtained. The thermal properties of these samples were studied by using differential scanning calorimeter (DSC) which allowed the quantitative determination of the evolution of stored energy, the recrystallization temperatures, the activation energy involved in the recrystallization of the material and the evolution of the recrystallized fraction with temperature. The results show that the stored energy increases, beyond which the stored energy seems to level off to a saturated value with increase of HPT up to 5 turns. An average activation energy of about 101 kJ/mol for the recrystallization of 5 turns samples was determined. Also, the thermal stability of the grains of the 5 turns samples with subsequent heat treatments were investigated by microstructural analysis and Vickers microhardness measurements. It is shown that the average grain size remains below 246 nm when the annealing temperature is below 500 °C, and the size of the grains increases significantly for samples at the annealing temperature of 600 °C.

Effect of composition, annealing temperature, and high pressure torsion on structure and hardness of Ti–V and Ti–V–Al alloys

2019 ◽  
Vol 125 (8) ◽  
pp. 082522 ◽  
Author(s):  
Alena S. Gornakova ◽  
Alexandr B. Straumal ◽  
Igor I. Khodos ◽  
Ivan B. Gnesin ◽  
Andrey A. Mazilkin ◽  
...  
Keyword(s):  
High Pressure ◽  
Annealing Temperature ◽  
High Pressure Torsion ◽  
Al Alloys

scholarly journals Effect of Annealing Temperature on the Microstructure and Mechanical Properties of High-Pressure Torsion-Produced 316LN Stainless Steel

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 181
Author(s):  
Yuanyuan Dong ◽  
Zhe Zhang ◽  
Zhihai Yang ◽  
Ruixiao Zheng ◽  
Xu Chen
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Stainless Steel ◽  
Grain Boundaries ◽  
Annealing Temperature ◽  
High Pressure Torsion ◽  
Annealing Process ◽  
Σ Phase ◽  
316Ln Stainless Steel ◽  
Ultrafine Grained

316LN stainless steel is a prospective structural material for the nuclear and medical instruments industries. Severe plastic deformation (SPD) combined with annealing possesses have been used to create materials with excellent mechanical properties. In the present work, a series of ultrafine-grained (UFG) 316LN steels were produced by high-pressure torsion (HPT) and a subsequent annealing process. The effects of annealing temperature on grain recrystallization and precipitation were investigated. Recrystallized UFG 316LN steels can be achieved after annealing at high temperature. The σ phase generates, at grain boundaries, at an annealing temperature range of 750–850 °C. The dislocations induced by recrystallized grain boundaries and strain-induced nanotwins are beneficial for enhancing ductility. Moreover, microcracks are easy to nucleate at the σ phase and the γ-austenite interface, causing unexpected rapid fractures.

Formation of nanograined structure and decomposition of supersaturated solid solution during high pressure torsion of Al–Zn and Al–Mg alloys

2004 ◽  
Vol 52 (15) ◽  
pp. 4469-4478 ◽  
Author(s):  
B.B Straumal ◽  
B Baretzky ◽  
A.A Mazilkin ◽  
F Phillipp ◽  
O.A Kogtenkova ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Supersaturated Solid Solution ◽  
High Pressure Torsion ◽  
Mg Alloys ◽  
Al Mg Alloys

Competition for impurity atoms between defects and solid solution during high pressure torsion

2019 ◽  
Vol 173 ◽  
pp. 46-50 ◽  
Author(s):  
A.A. Mazilkin ◽  
B.B. Straumal ◽  
A.R. Kilmametov ◽  
T. Boll ◽  
B. Baretzky ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Impurity Atoms

Hardness of Nanostructured Al-Zn, Al-Mg and Al-Zn-Mg Alloys Obtained by High-Pressure Torsion

2006 ◽  
Vol 249 ◽  
pp. 155-160 ◽  
Author(s):  
A.A. Mazilkin ◽  
B. Baretzky ◽  
S. Enders ◽  
Olga A. Kogtenkova ◽  
Boris B. Straumal ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Mg Alloys ◽  
Solid Solution Hardening ◽  
Second Phase ◽  
Cast State ◽  
Supersaturated Solid Solutions ◽  
Mg Content

Microstructure and hardness of ternary Al–Zn–Mg alloys were studied both in as cast state and after high pressure torsion (HPT) with 5 torsions (shear strain about 6). The size of (Al) grains and of reinforcing second phase precipitates decreases drastically after HPT reaching nanometer range. During HPT, the Zn- and Mg-rich supersaturated (Al) solid solution decomposes and reaches the equilibrium state corresponding to the room temperature. In the as cast state the hardness of the supersaturated solid solutions increases with increasing Zn and Mg content due to the solid-solution hardening. However, after HPT the work hardening and Hall-Petch hardening due to the decreasing grain size competes with softening due to the decomposition of a supersaturated solid solution. In the net effect, the severe plastic deformation results in softening of ternary Al–Zn– Mg alloys.

scholarly journals Structural and Mechanical Properties of Ti–Co Alloys Treated by High Pressure Torsion

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 426 ◽  
Author(s):  
Boris Straumal ◽  
Anna Korneva ◽  
Askar Kilmametov ◽  
Lidia Lityńska-Dobrzyńska ◽  
Alena Gornakova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Annealing Temperature ◽  
High Pressure Torsion ◽  
Pure Titanium ◽  
Eutectoid Transformation ◽  
Ω Phase ◽  
Preliminary Annealing ◽  
Increasing Temperature ◽  
Co Alloys

The microstructure and properties of titanium-based alloys can be tailored using severe plastic deformation. The structure and microhardness of Ti–4 wt.% Co alloy have been studied after preliminary annealing and following high pressure torsion (HPT). The Ti–4 wt.% Co alloy has been annealed at 400, 500, and 600 °C, i.e., below the temperature of eutectoid transformation in the Ti–4 wt.% Co system. The amount of Co dissolved in α-Ti increased with increasing annealing temperature. HPT led to the transformation of α-Ti in ω-Ti. After HPT, the amount of ω-phase in the sample annealed at 400 °C was about 80­85%, i.e., higher than in pure titanium (about 40%). However, with increasing temperature of pre-annealing, the portion of ω-phase decreased (60–65% at 500 °C and about 5% at 600 °C). The microhardness of all investigated samples increased with increasing temperature of pre-annealing.

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