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

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

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

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.

Formation of Nanostructure during High-Pressure Torsion of Al-Zn, Al-Mg and Al-Zn-Mg Alloys

2005 ◽  
Vol 237-240 ◽  
pp. 739-744 ◽  
Author(s):  
A.A. Mazilkin ◽  
Olga A. Kogtenkova ◽  
Boris B. Straumal ◽  
Ruslan Valiev ◽  
B. Baretzky
Keyword(s):  
Solid Solution ◽  
High Pressure ◽  
Equilibrium State ◽  
Room Temperature ◽  
Supersaturated Solid Solution ◽  
High Pressure Torsion ◽  
Mg Alloys ◽  
Supersaturated Solid Solutions ◽  
Before And After ◽  
Second Phases

Structure and phase composition of binary Al–Zn, Al–Mg and ternary Al–Zn–Mg alloys were studied before and after high pressure torsion (HPT) with shear strain 300. The size of (Al) grains and crystals of reinforcing second phases decreases drastically after HPT reaching nanometer range. As a result of HPT, the Zn-rich (Al) supersaturated solid solution decomposes completely and reaches the equilibrium state corresponding to room temperature. The decomposition is less pronounced for Al–Mg and Al–Zn–Mg alloys. We conclude that the severe plastic deformation of supersaturated solid solutions can be considered as a balance between deformation-induced disordering and deformation-accelerated diffusion towards the equilibrium state.

Severe Plastic Deformation of Copper, Binary Cu-Zn Solid-Solution Alloys, and High-Strength Brass by High-Pressure Torsion

2021 ◽  
Vol 1016 ◽  
pp. 780-785
Author(s):  
Takahiro Kunimine
Keyword(s):  
Solid Solution ◽  
Plastic Deformation ◽  
High Pressure ◽  
Severe Plastic Deformation ◽  
High Pressure Torsion ◽  
Copper Alloys ◽  
Pure Copper ◽  
High Strength ◽  
Casting Process ◽  
Β Phase

Severely-deformed high-strength brasses were investigated by leveraging high-pressure torsion (HPT) processing in order to obtain more enhanced mechanical properties of copper alloys. Pure copper, binary Cu-Zn solid-solution alloys and high-strength brasses including aluminum and manganese additions were selected for experiments. For comparison of these materials, zinc equivalent parameter was used. These materials were subjected to the HPT processing, followed by hardness tests and tensile tests. The maximal hardness value of the nanostructured high-strength brass with β phase matrix was reached 420 HV. The HPT processed high-strength brass with β phase matrix showed significant increase in the yield stress and tensile strength with sacrificing ductility. The tensile specimen of the high-strength brass with β phase matrix was fractured before initiation of necking. It was found that utilizing β phase matrix is also beneficial for controlling enhanced strength of high-strength copper alloys for not only casting process but also severe plastic deformation.

Microstructure of the Ni-W Solid Solution Prepared by Levitation and after High Pressure Torsion Severe Plastic Deformation

2012 ◽  
Vol 186 ◽  
pp. 104-107 ◽  
Author(s):  
Tomasz Czeppe ◽  
Anna Sypień ◽  
Galia F. Korznikova ◽  
Alexander Korznikov
Keyword(s):  
Solid Solution ◽  
Grain Size ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Metastable Phase ◽  
Continuous Phase ◽  
High Rate ◽  
Nominal Composition ◽  
Average Grain Size ◽  
The Matrix

The Ni-4at%W alloys was prepared with cold crucible levitation, subsequent levitation re-melting and high pressure torsion (HPT) intensive deformation. In samples after levitation precipitates of Ni4W phase as well as grain boundary continuous phase were formed. Levitation re-melting resulted in partial dissolution of the precipitates, increasing W content in the matrix and lead to the microstructure refinement. The deformation by HPT, in the range of 300-400%, lead to the lead to the homogenization of the solid solution and partial decomposition of the alloys into pure Ni and W. In the homogenous majority of the sample the microstructure transformed from dendrite microstructure to faceted grains. The analysis of the grains sizes and shapes showed that the average grain size in the sample re-melted by levitation was twice the grain size of the sample only prepared with CCLM. Also, the grains in this sample were elongated by 50-60% in one direction, while in the sample prepared by CCLM they were equiaxial. As the nominal composition of the alloys in both cases was the same, differences observed in the microstructure after re-melting and HPT processing must result only from the differences in the cooling rate leading to small differences in W content in solid solution and phase composition after solidification. High rate of cooling in the levitation methods resulted in Ni4W metastable phase precipitation as well as in the refinement of the microstructure, stronger after additional re-melting of the alloy by levitation.

Intermixing of Fe and Cu on the Atomic Scale by High-Pressure Torsion as Revealed by Dc- and Ac-Squid Susceptometry

2020 ◽  
Author(s):  
Martin Stückler ◽  
Heinz Krenn ◽  
Lukas Weissitsch ◽  
Stefan Wurster ◽  
Reinhard Pippan ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Atomic Scale
Sign in / Sign up

Export Citation Format

Share Document