Ing. Pavel Doležal, Ph.D.
E-mail:   dolezal@fme.vutbr.cz  Dept.:   Institute of Materials Science and Engineering Dept. of Metal Materials Position:   Assistant Professor Room:   A3/405

Supervised courses:

• Structure and Properties of Engineering Materials (WSI)

Publications:

• BUCHTÍK, M.; HASOŇOVÁ, M.; HORNÍK, P.; BŘEZINA, M.; DOSKOČIL, L.; MÁSILKO, J.; MRŇA, L.; FILIPENSKÝ, J.; KUBĚNA, I.; FINTOVÁ, S.; WASSERBAUER, J.; DOLEŽAL, P.:
  Influence of laser remelting on the microstructure and corrosion behavior of HVOF-sprayed Fe-based coatings on magnesium alloy, ELSEVIER SCIENCE INC
  journal article in Web of Science
• MINDA, J.; FINTOVÁ, S.; HADZIMA, B.; DOLEŽAL, P.; HASOŇOVÁ, M.; DOSKOČIL, L.; WASSERBAUER, J.:
  Electrochemical Corrosion Behavior of Pure Mg Processed by Powder Metallurgy , MDPI
  journal article in Web of Science
• ŠEBESTOVÁ, H.; HORNÍK, P.; MIKMEKOVÁ, Š.; MRŇA, L.; DOLEŽAL, P.; NOVOTNÝ, J.:
  Microstructural Characterization of Laser Weld of Hot-Stamped Al-Si Coated 22MnB5 and Modification of Weld Properties by Hybrid Welding, MDPI
  journal article in Web of Science
• BŘEZINA, M.; HASOŇOVÁ, M.; WASSERBAUER, J.; DOLEŽAL, P.; FINTOVÁ, S.:
  Mechanical and structural properties of bulk magnesium materials prepared via spark plasma sintering, ELSEVIER
  journal article in Web of Science
• DZIKOVÁ, J.; FINTOVÁ, S.; KAJÁNEK, D.; FLORKOVÁ, Z.; WASSERBAUER, J.; DOLEŽAL, P.:
  Characterization and Corrosion Properties of Fluoride Conversion Coating Prepared on AZ31 Magnesium Alloy, MDPI
  journal article in Web of Science
• BUCHTÍK, M.; DOSKOČIL, L.; BRESCHER, R.; DOLEŽAL, P.; MÁSILKO, J.; WASSERBAUER, J.:
  The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings, MDPI
  journal article in Web of Science
• DOLEŽAL, P.; HASOŇOVÁ, M.; MARADA, T.; DOLEŽALOVÁ WEISSMANNOVÁ, H.:
  Characterization of Mg-Zn Layered Bulk Materials Prepared by Powder Metallurgy Method,
  Defect and Diffusion Forum, pp.385-390, ISBN 1662-9507, (2020), Trans Tech Publications Ltd
  journal article in Scopus
• DRÁBIKOVÁ, J.; FINTOVÁ, S.; PTÁČEK, P.; KUBĚNA, I.; BŘEZINA, M.; WASSERBAUER, J.; DOLEŽAL, P.; PASTOREK, F.:
  Structure and growth kinetic of unconventional fluoride conversion coating prepared on wrought AZ61 magnesium alloy, ELSEVIER SCIENCE SA
  journal article in Web of Science
• ŠEBESTOVÁ, H.; HORNÍK, P.; MRŇA, L.; JAMBOR, M.; HORNÍK, V.; POKORNÝ, P.; HUTAŘ, P.; AMBROŽ, O.; DOLEŽAL, P.:
  Fatigue properties of laser and hybrid laser-TIG welds of thermo-mechanically rolled steels, ELSEVIER SCIENCE SA
  journal article in Web of Science
• FINTOVÁ, S.; DRÁBIKOVÁ, J.; HADZIMA, B.; TRŠKO, L.; BŘEZINA, M.; DOLEŽAL, P.; WASSERBAUER, J.:
  Degradation of unconventional fluoride conversion coating on AZ61 magnesium alloy in SBF solution, Elsevier B.V. All rights reserved.
  journal article in Web of Science
• FINTOVÁ, S.; DRÁBIKOVÁ, J.; PASTOREK. F.; TKACZ, J.; KUBĚNA, I.; TRŠKO, L.; HADZIMA, B.; MINDA, J.; DOLEŽAL, P.; WASSERBAUER, J.; PTÁČEK, P.:
  Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings, Elsevier
  journal article in Web of Science
• ŠEBESTOVÁ, H.; HORNÍK, P.; MRŇA, L.; DOLEŽAL, P.; MIKMEKOVÁ, E.:
  The Effect of Arc Current on Microstructure and Mechanical Properties of Hybrid LasTIG Welds of High-Strength Low-Alloy Steels, Springer US
  journal article in Web of Science
• BUCHTÍK, M.; KOSÁR, P.; WASSERBAUER, J.; TKACZ, J.; DOLEŽAL, P.:
  Characterization of Electroless Ni–P Coating Prepared on a Wrought ZE10 Magnesium Alloy, MDPI
  journal article in Web of Science
• ZAPLETAL, J.; DOLEŽAL, P.:
  Elastic and Plastic Behavior of the QE22 Magnesium Alloy Reinforced with Short Saffil Fibers and SiC Particles, MDPI AG
  journal article in Web of Science
• DRÁBIKOVÁ, J.; FINTOVÁ, S.; TKACZ, J.; DOLEŽAL, P.; WASSERBAUER, J.:
  Unconventional fluoride conversion coating preparation and characterization, Emerald Publishing
  journal article in Web of Science
• TKACZ, J.; SLOUKOVÁ, K.; MINDA, J.; DRÁBIKOVÁ, J.; FINTOVÁ, S.; DOLEŽAL, P.; WASSERBAUER, J.:
  Influence of the Composition of the Hank’s Balanced Salt Solution on the Corrosion Behavior of AZ31 and AZ61 Magnesium Alloys, MDPI
  journal article in Web of Science
• BŘEZINA, M.; MINDA, J.; DOLEŽAL, P.; KRYSTÝNOVÁ, M.; FINTOVÁ, S.; ZAPLETAL, J.; WASSERBAUER, J.; PTÁČEK, P.:
  Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications, MDPI AG
  journal article in Web of Science
• KRYSTÝNOVÁ, M.; DOLEŽAL, P.; FINTOVÁ, S.; BŘEZINA, M.; ZAPLETAL, J.; WASSERBAUER, J.:
  Preparation and Characterization of Zinc Materials Prepared by Powder Metallurgy, MDPI
  journal article in Web of Science
• BUCHTÍK, M.; KOSÁR, P.; WASSERBAUER, J.; DOLEŽAL, P.:
  Characterization of Ni-P coating prepared on wrought AZ61 magnesium alloy via electroless deposition
  journal article in Web of Science
• DOLEŽAL, P.; ZAPLETAL, J.; FINTOVÁ, S.; TROJANOVÁ, Z.; GREGER, M.; ROUPCOVÁ, P.; PODRÁBSKÝ, T.:
  Influence of Processing Techniques on Microstructure and Mechanical Properties of a Biodegradable Mg-3Zn-2Ca Alloy, MDPI
  journal article in Web of Science
• Filip Pastorek, Miroslav Omasta, Lenka Bukovinová, Pavel Doležal, Branislav Hadzima:
  BIODEGRADATION PROPERTIES OF AZ31 MAGNESIUM ALLOY COATED BY DICALCIUM PHOSPHATE DIHYDRATE, University of Zilina
  journal article in Scopus
• HORYNOVÁ, M.; ZAPLETAL, J.; DOLEŽAL, P.; GEJDOŠ, P.:
  Evaluation of fatigue life of AZ31 magnesium alloy fabricated by squeeze casting,
  Materials and design, Vol.45, (2013), No.3, pp.253-264, ISSN 0261-3069, ELSEVIER
  journal article - other
• DOLEŽAL, P.; ZAPLETAL, J.; HORYNOVÁ, M.; GEJDOŠ, P.; ČELKO, L.:
  CYCLIC DEFORMATION RESPONSE OF AZ31 MAGNESIUM ALLOY AFTER CORROSION DEGRADATION,
  Chemické listy, Vol.105, (2011), No.S, pp.787-789, ISSN 0009-2770, Chemické listy
  journal article - other

List of publications at Portal BUT

Abstracts of most important papers:

• DRÁBIKOVÁ, J.; FINTOVÁ, S.; TKACZ, J.; DOLEŽAL, P.; WASSERBAUER, J.:
  Unconventional fluoride conversion coating preparation and characterization, Emerald Publishing
  journal article in Web of Science
  Purpose – The purpose of this paper is to compare electrochemical corrosion characteristics of conventional and unconventional fluoride conversion coating prepared on magnesium alloy. Design/methodology/approach – The chemical reaction of AZ61 with 38 wt. % hydrofluoric acid (HF) for 24 h was used as a conventional way of fluoride conversion coating preparation. The unconventionally prepared coating was created in Na[BF4] salt melt at 450 °C for 2 h. Morphology and chemical composition of prepared fluoride conversion coatings were studied with scanning electron microscopy and energy-dispersive X-ray spectroscopy. Electrochemical corrosion characteristics of the coatings were analyzed in Hank's solution using potentiodynamic tests. Findings – Both the coating preparation ways resulted in a creation of uniform conversion coatings with the same thickness (1.3 ± 0.1 m). Some defects were observed on the coatings surface; however, the defects did not reach the AZ61 surface. Electrochemical tests performed in Hank's solution at 37 °C showed an improvement of corrosion resistance of AZ61 treated with fluoride conversion coatings when compared to the untreated material. Unconventionally prepared coating reached better electrochemical corrosion characteristics when compared to the conventionally prepared coating. Originality/value – Electrochemical corrosion characteristics of AZ61 magnesium alloy can be improved with fluoride conversion coatings. Two methods are used in the literature for the coatings preparation. The conventional method is based on dipping of the coated material to the HF and the unconventional method lies in dipping of the sample to the Na[BF4] salt melt. The main purpose of the present study is to analyze the conventionally and unconventionally prepared coatings in terms of chemical analysis, morphology and material corrosion protection (electrochemical corrosion characteristics), while the data are not provided in the literature according to the authors knowledge. Very similar coatings were prepared using both the methods from the morphological and chemical composition point of view. However, unconventionally prepared coating created in Na[BF4] salt melt reached better electrochemical corrosion characteristics compared to the coating prepared in HF.
• BŘEZINA, M.; MINDA, J.; DOLEŽAL, P.; KRYSTÝNOVÁ, M.; FINTOVÁ, S.; ZAPLETAL, J.; WASSERBAUER, J.; PTÁČEK, P.:
  Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications, MDPI AG
  journal article in Web of Science
  Magnesium and its alloys are modern lightweight materials applicable in a wide range of industrial fields from aerospace and automotive to biomedical applications. Its main advantages are a good strength to weight ratio and biocompatibility in combination with biodegradability. However, due to the high reactivity of pure Mg and the mechanical properties, not really sufficient for engineering applications, mainly magnesium alloys are used. Good mechanical properties of magnesium and its alloys can be furthermore significantly upgraded by decreasing the grain size, nowadays performed mainly via severe plastic deformation (SPD) techniques, powder metallurgy (PM) processing or by a combination of both methods
• KRYSTÝNOVÁ, M.; DOLEŽAL, P.; FINTOVÁ, S.; BŘEZINA, M.; ZAPLETAL, J.; WASSERBAUER, J.:
  Preparation and Characterization of Zinc Materials Prepared by Powder Metallurgy, MDPI
  journal article in Web of Science
  The use of zinc-based materials as biodegradable materials for medical purposes is offered as a possible alternative to corrosion-less resistant magnesium-based materials. Zinc powders with two different particle sizes (7.5 µm and 150 µm) were processed by the methods of powder metallurgy: cold pressing, cold pressing followed by sintering and hot pressing. The microstructure of prepared materials was evaluated in terms of light optical microscopy, and the mechanical properties were analyzed with Vickers microhardness testing and three-point bend testing. Fractographic analysis of broken samples was performed with scanning electron microscopy. Particle size was shown to have a significant effect on compacts mechanical properties. The deformability of 7.5 µm particle size powder was improved by increased temperature during the processing, while in the case of larger powder, no significant influence of temperature was observed. Bending properties of prepared materials were positively influenced by elevated temperature during processing and correspond to the increasing compacting pressures. Better properties were achieved for pure zinc prepared from 150-µm particle size powder compared to materials prepared from 7.5 µm particle size powder.
• BUCHTÍK, M.; KOSÁR, P.; WASSERBAUER, J.; DOLEŽAL, P.:
  Characterization of Ni-P coating prepared on wrought AZ61 magnesium alloy via electroless deposition
  journal article in Web of Science
  Low phosphorous Ni-P coating was prepared on wrought AZ61 magnesium alloy via electroless deposition for 1 hour after adequate substrate surface pre-treatment. Prepared coating with the thickness of 10 µm was characterized by uniform distribution of Ni (95.4 wt. %) and P (4.6 wt. %) in the cross-section. Microcavities present in the coating resulted in the quite low corrosion resistance of the coated magnesium alloy in 0.1 M NaCl solution. On the other hand, the coating exhibits a high degree of adhesion, as evidenced by scratch test, and significantly improves AZ61 magnesium alloy microhardness (from 79 ± 6 HV 0.025 to 700 ± 40HV 0.025).
• DOLEŽAL, P.; ZAPLETAL, J.; FINTOVÁ, S.; TROJANOVÁ, Z.; GREGER, M.; ROUPCOVÁ, P.; PODRÁBSKÝ, T.:
  Influence of Processing Techniques on Microstructure and Mechanical Properties of a Biodegradable Mg-3Zn-2Ca Alloy, MDPI
  journal article in Web of Science
  New Mg-3Zn-2Ca magnesium alloy was prepared using different processing techniques: gravity casting as well as squeeze casting in liquid and semisolid states. Materials were further thermally treated; thermal treatment of the gravity cast alloy was additionally combined with the equal channel angular pressing (ECAP). Alloy processed by the squeeze casting in liquid as well as in semisolid state exhibit improved plasticity; the ECAP processing positively influenced both the tensile and compressive characteristics of the alloy. Applied heat treatment influenced the distribution and chemical composition of present intermetallic phases. Influence of particular processing techniques, heat treatment, and intermetallic phase distribution is thoroughly discussed in relation to mechanical behavior of presented alloys.