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Ahmadkhaniha, Donya
Publications (7 of 7) Show all publications
Seifiyan, H., Heydarzadeh Sohi, M., Ansari, M., Ahmadkhaniha, D. & Saremi, M. (2019). Influence of friction stir processing conditions on corrosion behavior of AZ31B magnesium alloy. Journal of Magnesium and Alloys, 7(4), 605-616
Open this publication in new window or tab >>Influence of friction stir processing conditions on corrosion behavior of AZ31B magnesium alloy
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2019 (English)In: Journal of Magnesium and Alloys, ISSN 2213-9567, Vol. 7, no 4, p. 605-616Article in journal (Refereed) Published
Abstract [en]

The present study aims to investigate the effect of friction stir processing (FSP) conditions on the corrosion characteristic of AZ31B magnesium alloy. Specimens made of AZ31B alloy were friction stir processed under various processing conditions, and their microstructure and corrosion behavior were studied. The corrosion behavior was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and immersion test in 3.5% sodium chloride (NaCl) solution. The results showed a substantial improvement in the corrosion resistance of the friction stir processed AZ31B alloy. The improvement is likely a result of more stable corrosion products and microstructure refinement formed after friction sir processing. 

Place, publisher, year, edition, pages
KEAI Publishing, 2019
Keywords
Corrosion, EIS, Friction stir processing, Magnesium, Polarization
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-47211 (URN)10.1016/j.jma.2019.11.004 (DOI)000502568800007 ()2-s2.0-85076299977 (Scopus ID)GOA JTH 2019;JTHMaterialIS (Local ID)GOA JTH 2019;JTHMaterialIS (Archive number)GOA JTH 2019;JTHMaterialIS (OAI)
Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-01-02Bibliographically approved
Tsongas, K., Tzetzis, D., Karantzalis, A., Banias, G., Exarchos, D., Ahmadkhaniha, D., . . . Bochtis, D. (2019). Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings. Applied Sciences, 9(14), Article ID 2901.
Open this publication in new window or tab >>Microstructural, Surface Topology and Nanomechanical Characterization of Electrodeposited Ni-P/SiC Nanocomposite Coatings
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2019 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 9, no 14, article id 2901Article in journal (Refereed) Published
Abstract [en]

In the present study, nickel phosphorous alloys (Ni-P) and Ni-P/ silicon carbide (SiC) nanocomposite coatings were deposited by electrodeposition on steel substrates in order for their microstructural properties to be assessed while using SEM, XRD, and three-dimensional (3D) profilometry as well as nanoindentation. The amorphisation of the as-plated coatings was observed in all cases, whereas subsequent heat treatment induced crystallization and Ni3P intermetallic phase precipitation. Examination of the surface topology revealed that the surface roughness follows the deposition characteristics and heat treatment induced microstructural changes. Additionally, substantial improvements in mechanical properties, including hardness, yield stress, and elasticity modulus, were obtained for the Ni-P, Ni-P/SiC nanocomposites when heat treated as seen from the nanoindentation results. A Finite Element Analysis (FEA) was developed to simulate the nanoindentation tests that enable the precise extraction of the Ni-P and Ni-P/SiC nanocomposite coatings’ stress-strain behavior. It is shown that the correlation between the nanoindentation tests and the computational models was satisfactory, while the stress-strain curves revealed higher yield points for the heat-treated samples.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
Nanocomposite coatings, Electrodeposition, Nickel-phosphorus, SiC nanoparticles, Hardness, Finite Element Analysis
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:hj:diva-46429 (URN)10.3390/app9142901 (DOI)000479026900126 ()2-s2.0-85074378166 (Scopus ID)POA JTH 2019;JTHMaterialIS (Local ID)POA JTH 2019;JTHMaterialIS (Archive number)POA JTH 2019;JTHMaterialIS (OAI)
Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-11-12Bibliographically approved
Ahmadkhaniha, D. & Zanella, C. (2019). The effects of additives, particles load and current density on codeposition of SiC particles in NiP nanocomposite coatings. Coatings, 9(9), Article ID 554.
Open this publication in new window or tab >>The effects of additives, particles load and current density on codeposition of SiC particles in NiP nanocomposite coatings
2019 (English)In: Coatings, ISSN 2079-6412, Vol. 9, no 9, article id 554Article in journal (Refereed) Published
Abstract [en]

In this study, electrodeposition of NiP composite coatings with the addition of SiC 100 nm was carried out on low carbon steel studying the effect of additives (sodium dodecyl sulfate, saccharin), particles load (10 or 20 g/L) and current density (1, 2 and 4 A/dm2). As a benchmark, coatings from an additive-free bath were also deposited, despite additives being essential for a good quality of the coatings. The coating's morphology and composition were evaluated by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). It was shown that by addition of sodium dodecyl sulfate (SDS), pure NiP coating with a higher P content was achieved, and their morphology changed to nodular. SDS also reduced the codeposited fraction of SiC particles, while saccharin increased it. SiC loading and current density had less impact respect to the additives on codeposition of SiC particles. Finally, the microhardness of NiP coatings did not increase linearly by codeposition of SiC particles. 

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
Additives, Composite coating, Microhardness, NiP coating, SiC particle
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-46296 (URN)10.3390/coatings9090554 (DOI)000487973600062 ()2-s2.0-85072166505 (Scopus ID)GOA JTH 2019 (Local ID)GOA JTH 2019 (Archive number)GOA JTH 2019 (OAI)
Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2020-01-21Bibliographically approved
Ahmadkhaniha, D., Huang, Y., Jaskari, M., Järvenpää, A., Sohi, M. H., Zanella, C., . . . Langdon, T. G. (2018). Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg. Journal of Materials Science, 53(24), 16585-16597
Open this publication in new window or tab >>Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg
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2018 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 53, no 24, p. 16585-16597Article in journal (Refereed) Published
Abstract [en]

High-pressure torsion (HPT) processing was applied to cast pure magnesium, and the effects of the deformation on the microstructure, hardness, tensile properties and corrosion resistance were evaluated. The microstructures of the processed samples were examined by electron backscatter diffraction, and the mechanical properties were determined by Vickers hardness and tensile testing. The corrosion resistance was studied using electrochemical impedance spectroscopy in a 3.5% NaCl solution. The results show that HPT processing effectively refines the grain size of Mg from millimeters in the cast structure to a few micrometers after processing and also creates a basal texture on the surface. It was found that one or five turns of HPT produced no significant difference in the grain size of the processed Mg and the hardness was a maximum after one turn due to recovery in some grains. Measurements showed that the yield strength of the cast Mg increased by about seven times whereas the corrosion resistance was not significantly affected by the HPT processing. 

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Corrosion resistance, Electrochemical impedance spectroscopy, Grain size and shape, High pressure effects, Mechanical properties, Microstructure, Sodium chloride, Tensile testing, Torsional stress, Vickers hardness, Vickers hardness testing, 3.5% nacl solutions, Basal textures, Cast structures, Effect of high pressure, Electron back scatter diffraction, Grain size, High pressure torsions, Pure magnesium, Electrochemical corrosion
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-41252 (URN)10.1007/s10853-018-2779-1 (DOI)000445912300033 ()30393393 (PubMedID)2-s2.0-85051418547 (Scopus ID)JTHMaterialIS (Local ID)JTHMaterialIS (Archive number)JTHMaterialIS (OAI)
Available from: 2018-08-27 Created: 2018-08-27 Last updated: 2019-02-18Bibliographically approved
Ahmadkhaniha, D., Eriksson, F., Leisner, P. & Zanella, C. (2018). Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings. Journal of Alloys and Compounds, 769, 1080-1087
Open this publication in new window or tab >>Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings
2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 769, p. 1080-1087Article in journal (Refereed) Published
Abstract [en]

Electrodeposition of NiP composite coatings with nano and sub-micron sized SiC has been carried out to investigate the possibility of replacing hard chromium coatings. The composition and structure of the coatings were evaluated by energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. Microhardness was measured by Vickers indentation and polarization measurements were carried out to study the corrosion behavior of the coatings. The results showed that submicron particles can be codeposited with a higher content as compared to nano sized ones. However, even if a smaller amount of the nano-sized SiC particles are incorporated in the coating, the contribution to an increasing microhardness was comparable with the submicron sized particles, which can be related to the higher density of codeposited particles. SiC particles did not change the anodic polarization behavior of NiP coatings in a 3.5% NaCl solution. Finally, the effect of heat-treatment on the coatings properties at 400 °C for 1 h was studied to investigate the contribution of particles and heat-treatment on hardness and corrosion properties. It was found that the heat-treatment doubled the microhardness and changed the anodic polarization behavior of the coatings from passive to active with respect to the as-plated conditions.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Electrodeposition, Heat-treatment, Microhardness, NiP, Polarization, SiC
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:hj:diva-41502 (URN)10.1016/j.jallcom.2018.08.013 (DOI)000449481200126 ()2-s2.0-85051683091 (Scopus ID)
Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2019-04-26Bibliographically approved
Ahmadkhaniha, D., Huang, Y., Jaskari, M., Järvenpää, A., Heydarzadeh Sohi, M., Zanella, C., . . . Langdon, T. (2017). Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg. In: : . Paper presented at 6th International Biennial Conference on Ultrafine Grained and Nano-structured Materials (UFGNSM 2017), 12th-13th November, 2017, Kish Island, Iran.
Open this publication in new window or tab >>Effect of high-pressure torsion on microstructure, mechanical properties and corrosion resistance of cast pure Mg
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2017 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

High-pressure torsion (HPT) processing was applied to cast pure Mg pieces and its effects on microstructure, hardness and tensile properties as well as corrosion resistance were evaluated. The microstructure of the processed samples was examined by electron backscatter diffraction (EBSD) and the mechanical properties were determined by microhardness and tensile tests. Corrosion resistance of the samples was studied via electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. The results showed that HPT refined the grain size of Mg very effectively from millimeters in the cast structure to a few micrometers homogeneously through the thickness and created a basal texture on the surface. One or five turns of HPT produced no significant difference in the grain size of the processed Mg but the hardness was a maximum after one turn. The yield strength of the cast Mg was increased by seven times whereas the corrosion resistance was not affected by the HPT processing.

Keywords
Corrosion resistance, Grain size, Hardness, High-pressure torsion, Mg, Tensile strength, Texture
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:hj:diva-38704 (URN)
Conference
6th International Biennial Conference on Ultrafine Grained and Nano-structured Materials (UFGNSM 2017), 12th-13th November, 2017, Kish Island, Iran
Available from: 2018-02-02 Created: 2018-02-02 Last updated: 2018-09-19Bibliographically approved
Ahmadkhaniha, D., Pinate, S., Leisner, P. & Zanella, C. (2017). Electrodeposition of Ni high P composite coatings containing nano and submicro ceramic particles. In: : . Paper presented at EUROCORR 2017, | 20th International Corrosion Congress & Process Safety CongressAnnual Congress of the European Federation of Corrosion 2017, September 3–7, 2017, Czech Republic (pp. 721-729). European Federation of Corrosion
Open this publication in new window or tab >>Electrodeposition of Ni high P composite coatings containing nano and submicro ceramic particles
2017 (English)Conference paper, Published paper (Other academic)
Abstract [en]

In this study, electrodeposition of Ni-P composite coatings has been carried out to investigate the possibility of replacing hard chromium coatings. Therefore, electrodeposition of Ni-P based composite coating with different SiC particle size (50 nm, 100 nm and 500 nm) or B4C (500 nm) was performed. The coating’s composition was evaluated by energy dispersive spectroscopy (EDS), microhardness of the coatings was measured by Vickers indentor and polarization measurements were carried out to study the corrosion behavior of the coatings. The results showed that B4C particles can codeposit in higher percent respect to SiC ones. Ceramic particles increased microhardness of Ni-P coatings to 700HV0.01. The polarization behavior of all the coatings in 3.5% NaCl was similar in as plated state proving that particles did not hindered the passive behaviour. Finally, the effect of heat-treatment (at 400 ºC for 1 hour) on the coating’s properties was studied to compare the contribution of particles and heat-treatment on mechanical and corrosion properties of the coatings. Heat-treatment increased the coating’s microhardness and changed the anodic polarization behavior of the coatings respect to the as plated conditions.

Place, publisher, year, edition, pages
European Federation of Corrosion, 2017
Keywords
Ni-P electrodeposition, SiC, B4C, Microhardness, Polarization
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:hj:diva-38729 (URN)2-s2.0-85052306013 (Scopus ID)
Conference
EUROCORR 2017, | 20th International Corrosion Congress & Process Safety CongressAnnual Congress of the European Federation of Corrosion 2017, September 3–7, 2017, Czech Republic
Available from: 2018-02-02 Created: 2018-02-02 Last updated: 2019-04-26Bibliographically approved
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