Microstructure, Micro‐Hardness, and Corrosion Resistance of Commercial Purity Al Processed by Hollow‐Cone High‐Pressure Torsion

2018 ◽  
Vol 21 (3) ◽  
pp. 1800905 ◽  
Author(s):  
Jing Guo ◽  
Xiaorong Zhang ◽  
Dan Kong ◽  
Soo‐Hyun Joo ◽  
Wooyeol Kim ◽  
...  
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
High Pressure Torsion ◽  
Commercial Purity ◽  
Micro Hardness ◽  
Hollow Cone

scholarly journals Effects of High-Pressure Torsion on the Pitting Corrosion Resistance of Aluminum–Iron Alloys

2013 ◽  
Vol 54 (9) ◽  
pp. 1642-1649 ◽  
Author(s):  
Hiroaki Nakano ◽  
Hiroto Yamaguchi ◽  
Yohei Yamada ◽  
Satoshi Oue ◽  
In-Joon Son ◽  
...  
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
High Pressure Torsion ◽  
Iron Alloys ◽  
Pitting Corrosion Resistance

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

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 573
Author(s):  
Dmitry Gunderov ◽  
Andrey Stotskiy ◽  
Yuri Lebedev ◽  
Veta Mukaeva
Keyword(s):  
High Pressure ◽  
Zirconium Alloy ◽  
High Pressure Torsion ◽  
Ti Alloy ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ω Phase ◽  
First Time ◽  
Torsion Deformation

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.

Effect of Solution Pretreatment on Homogeneity and Corrosion Resistance of Biomedical Mg-Zn-Ca Alloy Processed by High Pressure Torsion

2016 ◽  
Vol 19 (1) ◽  
pp. 1600326 ◽  
Author(s):  
Congzheng Zhang ◽  
Shaokang Guan ◽  
Liguo Wang ◽  
Shijie Zhu ◽  
Jun Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
High Pressure Torsion

Hollow cone high-pressure torsion: Microstructure and tensile strength by unique severe plastic deformation

2014 ◽  
Vol 71 ◽  
pp. 41-44 ◽  
Author(s):  
Ho Yong Um ◽  
Eun Yoo Yoon ◽  
Dong Jun Lee ◽  
Chong Soo Lee ◽  
Lee Ju Park ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Pressure ◽  
Tensile Strength ◽  
Severe Plastic Deformation ◽  
High Pressure Torsion ◽  
Hollow Cone

scholarly journals The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion

2018 ◽  
Vol 13 ◽  
pp. 1834-1839 ◽  
Author(s):  
Dragana Barjaktarević ◽  
Jelena Bajat ◽  
Ivana Cvijović-Alagić ◽  
Ivana Dimić ◽  
Anton Hohenwarter ◽  
...  
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
High Pressure Torsion ◽  
Artificial Saliva ◽  
13Zr Alloy
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