scholarly journals Microstructure, Microhardness and Corrosion Resistance of WE43 Alloy Based Composites after High-Pressure Torsion

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2980 ◽  
Author(s):  
Petr Straumal ◽  
Natalia Martynenko ◽  
Askar Kilmametov ◽  
Aleksey Nekrasov ◽  
Brigitte Baretzky
Keyword(s):  
High Pressure ◽  
Corrosion Resistance ◽  
Oxide Layer ◽  
High Pressure Torsion ◽  
Chemical Deposition ◽  
Deposition Process ◽  
Second Phase ◽  
Alloy We43 ◽  
The One ◽  
We43 Alloy

The structure and properties of a composite consisting of Mg-Y-Nd-Zr alloy (WE43) and various oxides are studied. The particles of the WE43 powder were coated by the nanocrystalline oxide layer by means of a wet chemical deposition process. After that the powder is compressed into solid samples and deformed using high-pressure torsion at room temperature. A second phase is present, both, in pure WE43 alloy and in the one with deposited oxides. We observed that the modification of the alloy by the oxide layer deposition and deformation by high-pressure torsion changes the phase composition and properties of the samples. The samples modified by TiO2 showed the best microhardness and corrosion resistance.

Phase Composition and Properties of Magnesium-Ceramic Composites after High Pressure Torsion

2018 ◽  
Vol 385 ◽  
pp. 218-222 ◽  
Author(s):  
Petr B. Straumal ◽  
Natalia Martynenko ◽  
Daria Amelina ◽  
Aleksey Nekrasov ◽  
Sergey Dobatkin
Keyword(s):  
High Pressure ◽  
Phase Composition ◽  
Oxide Layer ◽  
High Pressure Torsion ◽  
Chemical Deposition ◽  
Deposition Process ◽  
Ceramic Composites ◽  
Second Phase ◽  
Alloy We43 ◽  
The One

The structure and properties of a composite consisting of Mg–Y–Nd–Zr alloy (WE43) and various oxides are studied. The particles of the WE43 powder were coated by the nanocrystalline oxide layer by means of a wet chemical deposition process. After that the powder is compressed into solid samples and deformed using high pressure torsion at room temperature. A second phase is present both in pure WE43 alloy and in the one with deposited oxides. We observed that the modification of the alloy by the oxide layer deposition and deformation by high pressure torsion changes the phase composition and properties of the samples.

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 Improving Corrosion Resistance of Magnesium Alloy in Cl- Containing Simulated Concrete Pore Solution by Ultrasound-Assisted Chemical Deposition

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Ye Wang ◽  
Guosong Wu
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloys ◽  
Pore Solution ◽  
Chemical Deposition ◽  
Deposition Process ◽  
Cross Sectional ◽  
X Ray ◽  
Electrochemical Tests ◽  
Reaction Solution ◽  
Building Engineering

Coatings are playing an important role in corrosion mitigation of magnesium alloys, and in this study, a facile and eco-friendly chemical deposition process is proposed to improve the corrosion resistance of magnesium-neodymium alloys. The mixture of 1.5 mol/L KH2PO4 solution and 1.2 mol/L CaCl2 solution is used for reaction solution, and ultrasound is introduced into the process for assisting the chemical deposition. After 40 minutes of the surface treatment, the surface and cross-sectional morphologies are observed by scanning electron microscope (SEM), which reveals that a layer of dense coating is formed on Mg alloy. Energy-dispersive X-ray spectroscopy (EDS) and X-ray Diffraction (XRD) are further combined to analyze the coating, and it is thereby confirmed that this coating mainly consists of CaHPO4·2H2O. Electrochemical tests and soaking experiments are conducted to evaluate the corrosion resistance of the treated samples in simulated concrete pore solutions. Both the untreated and treated samples have a good corrosion resistance in the Cl- free simulated concrete pore solution, but their corrosion behavior is influenced by the introduction of Cl- in this study. Fortunately, the coating can protect the substrate effectively in the Cl- containing simulated concrete pore solution. In summary, it provides a possible way for magnesium alloys to improve their corrosion resistance when they are used in building engineering.

scholarly journals Dissolution of Ag Precipitates in the Cu–8wt.%Ag Alloy Deformed by High Pressure Torsion

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 447 ◽  
Author(s):  
Anna Korneva ◽  
Boris Straumal ◽  
Askar Kilmametov ◽  
Robert Chulist ◽  
Grzegorz Cios ◽  
...  
Keyword(s):  
High Pressure ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Copper Matrix ◽  
Solubility Limit ◽  
Mixing Enthalpy ◽  
Diffusion Activation Energy ◽  
Second Phase ◽  
Silver Particles ◽  
Initial State

The aim of this work was to study the influence of severe plastic deformation (SPD) on the dissolution of silver particles in Cu–8wt.%Ag alloys. In order to obtain different morphologies of silver particles, samples were annealed at 400, 500 and 600 °C. Subsequently, the material was subjected to high pressure torsion (HPT) at room temperature. By means of scanning and transmission electron microscopy, as well as X-ray diffraction techniques, it was found that during SPD, the dissolution of second phase was strongly affected by the morphology and volume fraction of the precipitates in the initial state. Small, heterogeneous precipitates of irregular shape dissolved more easily than those of large size, round-shaped and uniform composition. It was also found that HPT led to the increase of solubility limit of silver in the copper matrix as the result of dissolution of the second phase. This unusual phase transition is discussed with respect to diffusion activation energy and mixing enthalpy of the alloying elements.

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

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

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

scholarly journals Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg

2018 ◽  
Vol 53 (24) ◽  
pp. 16585-16597 ◽  
Author(s):  
Donya Ahmadkhaniha ◽  
Yi Huang ◽  
Matias Jaskari ◽  
Antti Järvenpää ◽  
Mahmoud Heydarzadeh Sohi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Corrosion Resistance ◽  
High Pressure Torsion ◽  
Mechanical Properties And Corrosion
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