scholarly journals Effect of Initial Annealing Temperature on Microstructural Development and Microhardness in High-Purity Copper Processed by High-Pressure Torsion

2017 ◽  
Vol 20 (1) ◽  
pp. 1700503 ◽  
Author(s):  
Saleh N. Alhajeri ◽  
Abdulla I. Almazrouee ◽  
Khaled J. Al-Fadhalah ◽  
Terence G. Langdon
Keyword(s):  
High Pressure ◽  
High Purity ◽  
Annealing Temperature ◽  
High Pressure Torsion ◽  
Microstructural Development ◽  
Purity Copper

scholarly journals The significance of self-annealing at room temperature in high purity copper processed by high-pressure torsion

2016 ◽  
Vol 656 ◽  
pp. 55-66 ◽  
Author(s):  
Yi Huang ◽  
Shima Sabbaghianrad ◽  
Abdulla I. Almazrouee ◽  
Khaled J. Al-Fadhalah ◽  
Saleh N. Alhajeri ◽  
...  
Keyword(s):  
High Pressure ◽  
High Purity ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Purity Copper

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

2019 ◽  
Vol 22 (1) ◽  
pp. 1900589 ◽  
Author(s):  
Anna Kosinova ◽  
Boris Straumal ◽  
Askar Kilmametov ◽  
Petr Straumal ◽  
Marat Bulatov ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Boundaries ◽  
High Purity ◽  
High Pressure Torsion ◽  
Purity Copper

Microstructural Evolution and Micro-Compression in High-Purity Copper Processed by High-Pressure Torsion

2015 ◽  
Vol 18 (2) ◽  
pp. 241-250 ◽  
Author(s):  
Jianwei Li ◽  
Jie Xu ◽  
Chuan Ting Wang ◽  
Debin Shan ◽  
Bin Guo ◽  
...  
Keyword(s):  
High Pressure ◽  
Microstructural Evolution ◽  
High Purity ◽  
High Pressure Torsion ◽  
Purity Copper

Generation and healing of porosity in high purity copper by high-pressure torsion

2018 ◽  
Vol 145 ◽  
pp. 1-9 ◽  
Author(s):  
Yuanshen Qi ◽  
Anna Kosinova ◽  
Askar R. Kilmametov ◽  
Boris B. Straumal ◽  
Eugen Rabkin
Keyword(s):  
High Pressure ◽  
High Purity ◽  
High Pressure Torsion ◽  
Purity Copper

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.

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.

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