Ing. Ondřej Man, Ph.D.
E-mail:   man@fme.vutbr.cz  Dept.:   Institute of Materials Science and Engineering Dept. of Structural and Phase Analysis Position:   Research Worker Room:   A3/208

Supervised courses:

• Introduction to electron microscopy and microanalysis (DS131)
• Methods of Structure Analysis (WA1)
• Methods of Structure Analysis (WA1-A)
• Methods of Structure Analysis II (WA2)

Publications:

• PAVLOUŠKOVÁ, Z.; KLAKURKOVÁ, L.; MAN, O.; ČELKO, L.; ŠVEJCAR, J.:
  Assessment of the cause of cracking of hydraulic hose clamps, Elsevier
  journal article in Web of Science
• PANTĚLEJEV, L.; ŠTĚPÁNEK, R.; MAN, O.:
  Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP, Elsevier
  journal article in Web of Science
• ČÍŽEK, J.; MAN, O.; ROUPCOVÁ, P.; LOKE, K.; DLOUHÝ, I.:
  Oxidation Performance of Cold Spray Ti-Al Barrier Coated gamma-TiAl Intermetallic Substrates, Elsevier
  journal article in Web of Science
• ČÍŽEK, J.; MAN, O.; DLOUHÝ, I.:
  Influence of Cold-Sprayed Al/Ti Deposition on High-temperature Oxidation and Mechanical Properties Deterioration of Ti-Al-Nb Intermetallic Substrates,
  International Thermal Spray Conference 2014 Proceedings, pp.903-907, ISBN 978-3-87155-574-9, (2014), DVS Media GmbH
  conference paper
  akce: International Thermal Spray Conference 2014, Barcelona, 21.05.2014-23.05.2014
• ŠTĚPÁNEK, R.; PANTĚLEJEV, L.; MAN, O.:
  Thermal stability of magnesium alloy AZ91 prepared by severe plastic deformation,
  Materiálové inžinierstvo, Vol.20, (2013), No.4, pp.160-166, ISSN 1335-0803, University of Žilina
  journal article - other
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of Microstructure of Ultrafine-Grained Copper Under Fatigue and Thermal Exposition,
  STRAIN, Vol.47, (2011), No.6, pp.476-482, ISSN 0039-2103, Blackwell Publishing Ltd
  journal article - other
• PANTĚLEJEV, L.; MAN, O.; KUNZ, L.:
  Microstructural stability of ultrafine grained copper at elevated temperature,
  Acta Metallurgica Slovaca, Vol.17, (2011), No.3, pp.158-162, ISSN 1335-1532, Technická universita Košice
  journal article - other
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of ultrafine-grained structure of copper under fatigue loading,
  Procedia Engineering, Vol.10, (2011), No.ICM11, pp.201-206, ISSN 1877-7058, ELSEVIER
  journal article - other
• MIKMEKOVÁ, Š.; MAN, O.; PANTĚLEJEV, L.; HOVORKA, M.; MÜLLEROVÁ, I.; FRANK, L.; KOUŘIL, M.:
  Strain mapping by Scanning Low Energy Electron Microscopy,
  Key Engineering Materials (print), Vol.465, (2011), No.1, pp.338-341, ISSN 1013-9826, Trans Tech Publications
  journal article - other
• MIKMEKOVÁ, Š.; HOVORKA, M.; MÜLLEROVÁ, I.; MAN, O.; PANTĚLEJEV, L.; FRANK, L.:
  Grain Contrast Imaging in UHV SLEEM,
  MATERIALS TRANSACTIONS, Vol.51, (2010), No.2, pp.292-296, ISSN 1345-9678, The Japan Institute of Metals
  journal article - other
• MAN, O.; PANTĚLEJEV, L.; KUNZ, L.:
  Study of Thermal stability of Ultrafine-grained Copper by means of Electron Back Scattering Diffraction,
  MATERIALS TRANSACTIONS, Vol.51, (2010), No.2, pp.209-213, ISSN 1345-9678, The Japan Institute of Metals
  journal article - other
• ČELKO, L.; KLAKURKOVÁ, L.; MAN, O.; ŠVEJCAR, J.:
  Use of the powder liquid method for aluminide diffusion coatings formation on inconel 713 LC Ni- based superalloy,
  Materials and Manufacturing Processes, Vol.24, (2009), No.2009, pp.1155-1161, ISSN 1042-6914
  journal article - other
• NAVRÁTILOVÁ, L.; KUNZ, L.; MAN, O.; PANTĚLEJEV, L.:
  Effect of Annealing on Microstructure and Fatigue Life of UFG Copper,
  Materiálové inžinierstvo, Vol.XVI, (2009), No.3a, pp.28-31, ISSN 1335-0803, University of Žilina
  journal article - other
• MAN, O.; PANTĚLEJEV, L.; PEŠINA, Z.:
  EBSD Analysis of Phase Compositions of TRIP Steel on Various Strain Levels,
  Materiálové inžinierstvo, Vol.XVI, (2009), No.2, pp.11-17, ISSN 1335-0803, University of Žilina
  journal article - other
• MAN, J.; KLAPETEK, P.; MAN, O.; WEIDNER, A.; OBRTLÍK, K.; POLÁK, J.:
  Extrusions and intrusions in fatigued metals: Part 2. AFM and EBSD study of the early growth of extrusions and intrusions in 316L steel fatigued at room temperature,
  PHILOSOPHICAL MAGAZINE, Vol.89, (2009), No.16, pp.1337-1372, ISSN 1478-6435, Taylor and Francis
  journal article - other
• KLAKURKOVÁ, L.; ČELKO, L.; DOLEŽAL, P.; MAN, O.; NĚMEC, K.:
  Elements interaction analyses during preparation of Al-Al3Ni eutectic composites,
  Chemické listy (S), Vol.102, (2008), No.S, pp.884-885, ISSN 1803-2389, Brno University of Technology, Faculty of Chemistry
  journal article - other
  akce: 4th Meeting on Chemistry & Life, Brno, 09.09.2008-11.09.2008
• JULIŠ, M.; MAN, O.; OBRTLÍK, K.; PODRÁBSKÝ, T.; POLÁK, J.:
  Fatigue Damage Evolution in Cast Inconel 738LC using Confocal Laser Scanning Microscope and AFM,
  Proceedings of ECF 17, pp.2314-2319, ISBN 9781617823190, (2008), VUTIUM Brno
  conference paper
  akce: European Conference on Fracture, ECF17, Brno, 02.09.2008-05.09.2008

List of publications at Portal BUT

Abstracts of most important papers:

• PANTĚLEJEV, L.; ŠTĚPÁNEK, R.; MAN, O.:
  Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP, Elsevier
  journal article in Web of Science
  The changes in microstructure of equal channel angular pressing (ECAP) processed magnesium alloy AZ91 during thermal exposure were studied in this paper. The microstructure stability was investigated by means of electron backscatter diffraction (EBSD), which allowed measuring the changes in grain size, mutual ratio of low-angle boundaries (LABs) to high-angle ones (HABs) and local lattice distortion evaluated by the kernel average misorientation (KAM) parameter. It was found experimentally that the threshold temperature at which significant grain coarsening takes place is 350 centigrade. No modification to mean grain diameter occur below this temperature, nonetheless, some changes in LAB and HAB fraction, as well as in local lattice distortion, can be observed.
• ČÍŽEK, J.; MAN, O.; ROUPCOVÁ, P.; LOKE, K.; DLOUHÝ, I.:
  Oxidation Performance of Cold Spray Ti-Al Barrier Coated gamma-TiAl Intermetallic Substrates, Elsevier
  journal article in Web of Science
  Four blends of Al powder containing different amounts of Ti were deposited onto Ti-46Al-7Nb substrates as oxidation-protection layers using low-pressure cold spray. The coating morphology and chemical composition were assessed. Optimized heat treatment in protective atmosphere was carried out in order to induce formation of intermetallic phases within the deposits. The specimens were then subjected to 950'C exposure for 100, 250, and 500 hrs and their oxidation performance was monitored using the gravimetric method. It was found that the oxidation rate of the coating-protected specimens was substantially reduced (an increase in the weight gain of 1.37 mg/cm2 after 500 hrs of specimen with Al coating) as compared to their uncoated counterparts (1.21 mg/cm2 after 50 hrs at 900'C). The oxidation rates increased with increasing content of Ti in the coatings. Substantial changes of the coating integrity were recorded after the long-term oxidation testing.
• KUNZ, L.; LUKÁŠ, P.; PANTĚLEJEV, L.; MAN, O.:
  Stability of Microstructure of Ultrafine-Grained Copper Under Fatigue and Thermal Exposition,
  STRAIN, Vol.47, (2011), No.6, pp.476-482, ISSN 0039-2103, Blackwell Publishing Ltd
  journal article - other
  Effect of cyclic loading and thermal exposition on microstructure of bulk ultrafinegrained Cu prepared by equal channel angular pressing was experimentally investigated by means of electron backscattering diffraction and by transmission electron microscopy. Stability of the microstructure under stress-controlled cyclic loading with a tensile mean stress of 200 MPa was shown to be high. Neither dynamic grain coarsening nor development of bimodal microstructure was observed. However, annealing at 250 C for 30 min resulted in formation of bimodal microstructure. Consequently, fatigue strength of annealed specimens was low.
• MAN, O.; PANTĚLEJEV, L.; PEŠINA, Z.:
  EBSD Analysis of Phase Compositions of TRIP Steel on Various Strain Levels,
  Materiálové inžinierstvo, Vol.XVI, (2009), No.2, pp.11-17, ISSN 1335-0803, University of Žilina
  journal article - other
  Flat test bar made of TRIP steel was sequentially strained in tension. Eeach deformation step was made on a predefined strain level in which the phase composition was measured using EBSD; the analyses were made ex-situ exactly in the same area of 30x30 micrometer. Retained austenite (RA) was present in the form of elongated grains (plates) and roughly equiaxial ones. The RA content was initially 14.5% and decreased with imposed strain down to approximately 5% in selected strain range from 0% to 10%. This is in agreement to some extent with outcomes of both in-situ and ex-situ experiments presented by other authors, the difference beeing supposed either in data clean up or in variation in micriostructure of particular steel. Kernel average misorientation method was confirmed as useful tool to discern bainite and grainy ferrite in lightly deformed specimen. Problem arose in distinguishing between martensite and deformed ferrite at higher deformation levels because of high dislocation density and/or lattice distortion in both components. The ferrite and retained austenite fraction were analysed with sufficient accuracy; martensite fraction was established with high degree of uncertainty.
• MAN, J.; KLAPETEK, P.; MAN, O.; WEIDNER, A.; OBRTLÍK, K.; POLÁK, J.:
  Extrusions and intrusions in fatigued metals: Part 2. AFM and EBSD study of the early growth of extrusions and intrusions in 316L steel fatigued at room temperature,
  PHILOSOPHICAL MAGAZINE, Vol.89, (2009), No.16, pp.1337-1372, ISSN 1478-6435, Taylor and Francis
  journal article - other
  Early stages of surface relief evolution of persistent slip markings (PSMs), formed in areas where persistent slip bands (PSBs) intersect the free surface, in polycrystalline 316L stainless steel cycled with constant plastic strain amplitude were studied using atomic force microscopy (AFM) and electron backscattering diffraction (EBSD). Focused ion beam (FIB) technique was employed to obtain additional, more detailed information on the shape of PSMs. To reveal true qualitative and quantitative information on the simultaneous growth of intrusions and extrusions within individual PSMs, identical areas both on the specimen surface and on its inverse copy obtained via plastic replica were studied using AFM. Intrusions are preceded by extrusions regardless of orientation of individual grains of the polycrystal. The first intrusions appear largely around 1% of fatigue life at the moment when 'static' extrusions are developed. They appear predominantly but not exclusively at the side of extrusions where the emerging active slip plane is inclined to the surface at an acute angle. They grow faster than the stage of stable extrusion growth. Typical morphology of mature PSMs developed at 15% of fatigue life consists of ribbon-like extrusions accompanied by two thin parallel intrusions along both PSB-matrix interfaces. Experimental data on the morphology and growth of extrusions and intrusions are discussed in relation to the theoretical models and computer simulations of surface relief evolution leading to fatigue crack initiation.