Orientation dependency of the alpha to omega plus beta transformation in commercially pure zirconium by high-pressure torsion

2011 ◽  
Vol 65 (3) ◽  
pp. 241-244 ◽  
Author(s):  
B. Srinivasarao ◽  
A.P. Zhilyaev ◽  
M.T. Pérez-Prado
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Commercially Pure ◽  
Pure Zirconium ◽  
Orientation Dependency

scholarly journals Hardening mechanism of commercially pure Mg processed by high pressure torsion at room temperature

2014 ◽  
Vol 619 ◽  
pp. 95-106 ◽  
Author(s):  
Xiao Guang Qiao ◽  
Ya Wei Zhao ◽  
Wei Min Gan ◽  
Ying Chen ◽  
Ming Yi Zheng ◽  
...  
Keyword(s):  
High Pressure ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Hardening Mechanism ◽  
Commercially Pure

X-Ray Analysis of High Pressure Torsion Induced Nanostructures in Ti and Ni

2006 ◽  
Vol 114 ◽  
pp. 329-336 ◽  
Author(s):  
A.R. Kilmametov ◽  
Ruslan Valiev ◽  
Igor V. Alexandrov
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Applied Pressure ◽  
Orientation Distribution ◽  
Nanocrystalline State ◽  
Cubic Symmetry ◽  
X Ray ◽  
Ω Phase ◽  
Commercially Pure ◽  
Pressure Phase

X-ray investigations revealed that the increase in the applied pressure during high pressure torsion (HPT) of commercially pure Ti leads not only to substructure refinement with an increase of the dislocation density and microstrain level but also to an α→ ω phase transition at room temperature. The coexistence of both α and ω phases, the latter known as a high pressure phase, in the ratio approximately of 1:3 has been obtained after removal of thehigh pressure. Texture analysis of electodeposited Ni after HPT discovered a new form of crystallite orientation distribution in the nanocrystalline state. A nearly random orientation crystallite distribution has been observed unlike the “traditional” case of a shear texture forming in cubic symmetry metals. The crystallographic texture data obtained were considered as experimental evidence of the changed plastic deformation mechanisms in nanocrystalline Ni produced by HPT.

scholarly journals Slippage during high-pressure torsion of commercially pure titanium and application of accumulative HPT to it

2022 ◽  
Vol 1213 (1) ◽  
pp. 012003
Author(s):  
D V Gunderov ◽  
A A Churakova ◽  
A V Sharafutdinov ◽  
V D Sitdikov ◽  
V V Astanin
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Pure Titanium ◽  
Phase Changes ◽  
Phase Content ◽  
Commercially Pure Titanium ◽  
Micro Hardness ◽  
Ω Phase ◽  
Commercially Pure ◽  
First Time

Abstract A new efficient method was used to find that in the case of high-pressure torsion of commercially pure titanium, accumulation of shear strain in Ti does not occur due to slippage of anvils. Despite this, micro-hardness increases as the number of turns n increases, and Ti structure is refined more intensively. High-pressure torsion is accompanied by a high-pressure ω-phase formation. However, the content of ω-phase changes non-monotonously with an increase in the number of turns. First, while number of turns is less than n=5, the ω-phase content reaches 50%. Upon further deformation, the ω-phase content decreases to 15% for n=20. A new accumulative high-pressure torsion method is applied to commercially pure titanium for the first time. Accumulative high-pressure torsion leads to the strongest transformation of the structure and an increase in hardness, since stronger real deformation occurs due to composition of compression and torsion strain cycles.

scholarly journals Tailoring the microstructure and tribological properties in commercially pure aluminium processed by High Pressure Torsion Extrusion

2021 ◽  
Vol 70 (4) ◽  
pp. 540
Author(s):  
M Antonov ◽  
E Garcia-Sanchez ◽  
M A Hernandez-Rodriguez ◽  
J Ivanisenko ◽  
L Kommel ◽  
...  
Keyword(s):  
High Pressure ◽  
Tribological Properties ◽  
High Pressure Torsion ◽  
Pure Aluminium ◽  
Commercially Pure

scholarly journals Allotropic phase transformation of pure zirconium by high-pressure torsion

2009 ◽  
Vol 523 (1-2) ◽  
pp. 277-281 ◽  
Author(s):  
Kaveh Edalati ◽  
Zenji Horita ◽  
Shunsuke Yagi ◽  
Eiichiro Matsubara
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Pressure Torsion ◽  
Pure Zirconium

Consolidation of Magnesium and Magnesium Alloy Machine Chips Using High-Pressure Torsion

2018 ◽  
Vol 941 ◽  
pp. 851-856 ◽  
Author(s):  
Moara M. de Castro ◽  
Amanda P. Carvalho ◽  
Pedro Henrique R. Pereira ◽  
Augusta C. Isaac Neta ◽  
Roberto Braga Figueiredo ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnesium Alloy ◽  
Optical Microscopy ◽  
High Pressure Torsion ◽  
Processing Technique ◽  
Pure Magnesium ◽  
Alloy Az91 ◽  
Commercially Pure ◽  
Magnesium Alloy Az91

The high-pressure torsion processing technique was used to consolidate and process magnesium-based chips. Chips were prepared by machining commercially pure magnesium and a magnesium alloy AZ91 separately. Optical microscopy and microhardness measurements showed good consolidation of pure magnesium. The magnesium alloy continued to exhibit the boundaries between the chips even after 5 turns of HPT suggesting poor bonding. The results show that soft chips are easier to consolidate through HPT than harder alloys.

Effect of Hf Doping of Commercially Pure Copper on Evolution of its Microstructure under High Pressure Torsion

2020 ◽  
Vol 299 ◽  
pp. 424-429
Author(s):  
Alexey V. Stolbovsky ◽  
Vladimir Popov ◽  
Ruslan Falahutdinov
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Pure Copper ◽  
Limiting Factor ◽  
Relaxation Processes ◽  
Commercially Pure ◽  
Commercially Pure Copper

Evolution of the structure of commercially pure copper and Cu-0.8%Hf alloy under high pressure torsion (HPT) is compared. It is demonstrated that doping with Hf affects appreciably a tendency to relaxation processes inherent to copper. Introduction of additional impurities enables to achieve finer fragmentation of structure and increase of microhardness with the strain growth, compared to the commercially pure copper, in which these parameters are weakened by the intensively developing relaxation processes. However, these processes can serve a limiting factor for fragmentation and microhardness increase in the Cu-0.8Hf alloy as well, under the HPT by 5 revolutions of anvils.

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