Prof. Dr. Florian Pyczak
Institute of Materials Research, Materials PhysicsMax-Planck-Str. 1
21502 GeesthachtTel. +49 4152/87-2545E-mail contactWebsite
The research of the Metal Physics group is aimed at developing further intermetallic TiAl alloys and suitable manufacturing processes for these alloys using powder, casting and forming technology. It is indispensable to understand the causes of the mechanical properties essential for the application and to clarify their dependence on composition and manufacturing conditions. For this purpose, extensive investigations are carried out to characterize the microstructure and atomic defects as well as the mechanical behavior of this alloy system.
- Scanning electron microscopy (Leo Gemini 1530, Zeiss DSM 962)
- Transmission electron microscopy (FEI Talos F200i, FEI Titan 80-300)
- Dynamic High-Temperature-Calorimeter
- Bähr Thermoanalytic
- Leeco analysis system
- Powder atomisation unit
- DS-Unit
- Laboratory arc melting unit with cold crucible
- Forging-Simulator
- Mechanical testing
- Investigations on L12 phase and partitioning behavior of alloying elements in Co-base superalloys, Initiative and Networking Fund of the Helmholtz Association
- Novel engine repair methods, Federal Ministry of Economics and Energy within the Aviation Research Programme (LUFO)
- ADVANCE: Sophisticated experiments and optimisation to advance an existing CALPHAD database for next generation TiAl alloys; European Union (Clean Sky)
• Han, L., Xu, X., Wang, L., Pyczak, F., Zhou, R., Liu, Y.: A eutectic high-entropy alloy with good high-temperature strength-plasticity balance. (2019) Materials Research Letters, 7 (11), pp. 460-466.
• Song, L., Hu, X., Wang, L., Stark, A., Lazurenko, D., Lorenz, U., Lin, J., Pyczak, F., Zhang, T.: Microstructure evolution and enhanced creep property of a high Nb containing TiAl alloy with carbon addition. (2019) Journal of Alloys and Compounds, 807, art. no. 151649, .
• Wang, L., Song, L., Stark, A., Liu, Y., Oehring, M., Lorenz, U., Pyczak, F.: Identification of Laves phases in a Zr or Hf containing γ-γ′ Co-base superalloy. (2019) Journal of Alloys and Compounds, 805, pp. 880-886.
• Bakan, E., Mauer, G., Sohn, Y.J., Schwedt, A., Rackel, M.W., Riedlberger, F., Pyczak, F., Peters, J.O., Mecklenburg, M., Gartner, T.M., Vaßen, R.: Cold gas spraying of Ti-48Al-2Cr-2Nb intermetallic for jet engine applications. (2019) Surface and Coatings Technology, 371, pp. 203-210.
• Song, L., Wang, L., Oehring, M., Hu, X., Appel, F., Lorenz, U., Pyczak, F., Zhang, T.: Evidence for deformation twinning of the D0 19 -α 2 phase in a high Nb containing TiAl alloy. (2019) Intermetallics, 109, pp. 91-96.
• Wang, L., Oehring, M., Li, Y., Song, L., Liu, Y., Stark, A., Lorenz, U., Pyczak, F.: Microstructure, phase stability and element partitioning of γ-γ′ Co-9Al-9W-2X alloys in different annealing conditions. (2019) Journal of Alloys and Compounds, pp. 594-605.
• Hauschildt, K., Stark, A., Schell, N., Müller, M., Pyczak, F.: The transient liquid phase bonding process of a γ-TiAl alloy with brazing solders containing Fe or Ni. (2019) Intermetallics, 106, pp. 48-58.
• Lazurenko, D.V., Stark, A., Esikov, M.A., Paul, J., Bataev, I.A., Kashimbetova, A.A., Mali, V.I., Lorenz, U., Pyczak, F.: Ceramic-reinforced γ-TiAl-based composites: Synthesis, structure, and properties. (2019) Materials, 12 (4), art. no. 629, .
• Bresler, J., Neumeier, S., Ziener, M., Pyczak, F., Göken, M.: The influence of niobium, tantalum and zirconium on the microstructure and creep strength of fully lamellar γ/α 2 titanium aluminides. (2019) Materials Science and Engineering A, 744, pp. 46-53.
• Schnabel, J.E., Bargmann, S., Paul, J.D.H., Oehring, M., Pyczak, F.: Work hardening and recovery in fully lamellar TiAl: relative activity of deformation systems. (2019) Philosophical Magazine, 99 (2), pp. 148-180.
• Wang, L., Oehring, M., Liu, Y., Lorenz, U., Pyczak, F.: Site occupancy of alloying elements in the L12 structure determined by channeling enhanced microanalysis in γ/γ’ Co-9Al-9W-2X alloys. (2019) Acta Materialia, 162, pp. 176-188.
• Li, Y., Pyczak, F., Paul, J., Yao, Z.: Oxidation behaviors of Co-Al-W-0.1B superalloys in a long-term isothermal exposure at 900 °C. (2018) Journal of Materials Science and Technology, 34 (11), pp. 2212-2217.
• Bambach, M., Emdadi, A., Sizova, I., Hecht, U., Pyczak, F.: Isothermal forging of titanium aluminides without beta-phase — Using non-equilibrium phases produced by spark plasma sintering for improved hot working behavior. (2018) Intermetallics, 101, pp. 44-55.
• Wang, L., Oehring, M., Lorenz, U., Stark, A., Pyczak, F: New insights into perovskite-Ti3AlC precipitate splitting in a Ti-45Al-5Nb-0.75C alloy by transmission electron microscopy. (2018) Intermetallics, 100, pp. 70-76.
• Wang, L., Oehring, M., Lorenz, U., Yang, J., Pyczak, F.: Influence of alloying additions on L12 decomposition in γ-γ′ Co-9Al-9W-2X quaternary alloys. (2018) Scripta Materialia, 154, pp. 176-181.
• Freund, L.P., Stark, A., Kirchmayer, A., Schell, N., Pyczak, F., Göken, M., Neumeier, S.: The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density. (2018) Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 49 (9), pp. 4070-4078.
• Lazurenko, D.V., Bataev, I.A., Mali, V.I., Jorge, A.M., Jr., Stark, A., Pyczak, F., Ogneva, T.S., Maliutina, I.N.: Synthesis of metal-intermetallic laminate (MIL) composites with modified Al 3 Ti structure and in situ synchrotron X-ray diffraction analysis of sintering process. (2018) Materials and Design, 151, pp. 8-16.
• Freund, L.P., Stark, A., Pyczak, F., Schell, N., Göken, M., Neumeier, S.: The grain boundary pinning effect of the μ phase in an advanced polycrystalline γ/γ′ Co-base superalloy. (2018) Journal of Alloys and Compounds, 753, pp. 333-342.
• ZHAO, D.-P., CHEN, Y.-K., CHANG, K.-K., EBEL, T., LUTHRIGNER-FEYERABEND, B.J.C., WILLUMEIT-RÖMER, R., PYCZAK, F.: Surface topography and cytocompatibility of metal injection molded Ti–22Nb alloy as biomaterial. (2018) Transactions of Nonferrous Metals Society of China (English Edition), 28 (7), pp. 1342-1350.
• Li, Y., Pyczak, F., Paul, J., Oehring, M., Lorenz, U., Yao, Z., Ning, Y.: Rafting of γ′ precipitates in a Co-9Al-9W superalloy during compressive creep. (2018) Materials Science and Engineering A, 719, pp. 43-48.
• Kim, Y.M., Mendis, C., Sasaki, T., Letzig, D., Pyczak, F., Hono, K., Yi, S.: Erratum to “Static recrystallization behaviour of cold rolled Mg-Zn-Y alloy and role of solute segregation in microstructure evolution” (Scr. Mater. (2017) (136) (41–45) (S135964621730177X) (10.1016/j.scriptamat.2017.04.001)). (2018) Scripta Materialia, 145, p. 131.
• Li, Y., Pyczak, F., Paul, J., Oehring, M., Lorenz, U., Yao, Z.: Microstructure evolution in L12hardened Co-base superalloys during creep. (2017) Journal of Materials Research, 32 (24), pp. 4522-4530.
• Wang, L., Lorenz, U., Münch, M., Stark, A., Pyczak, F.: Influence of alloy composition and thermal history on carbide precipitation in γ-based TiAl alloys. (2017) Intermetallics, 89, pp. 32-39.
• Wang, L., Zenk, C., Stark, A., Felfer, P., Gabrisch, H., Göken, M., Lorenz, U., Pyczak, F.: Morphology evolution of Ti3AlC carbide precipitates in high Nb containing TiAl alloys. (2017) Acta Materialia, 137, pp. 36-44.
• Gabrisch, H., Lorenz, U., Pyczak, F., Rackel, M., Stark, A.: Morphology and stability of orthorhombic and hexagonal phases in a lamellar γ-Ti-42Al-8.5Nb alloy-A transmission electron microscopy study. (2017) Acta Materialia, 135, pp. 304-313.
• Kim, Y.M., Mendis, C., Sasaski, T., Letzig, D., Pyczak, F., Hono, K., Yi, S.: Static recrystallization behaviour of cold rolled Mg-Zn-Y alloy and role of solute segregation in microstructure evolution. (2017) Scripta Materialia, 136, pp. 41-45.
• Paul, J.D.H., Oehring, M., Appel, F., Pyczak, F.: Depth resolved near-surface residual stresses in γ-based TiAl before and after high-temperature exposure. (2017) Intermetallics, 84, pp. 103-111.
• Luo, X., Ebel, T., Pyczak, F., Limberg, W., Lin, Y.: Carbide evolution and its potential reduction methods in Ti-22Nb based alloys prepared by metal injection moulding. (2017) Materials Letters, 193, pp. 295-298.
• Soyama, J., Oehring, M., Ebel, T., Kainer, K.U., Pyczak, F.: Sintering Behavior and Microstructure Formation of Titanium Aluminide Alloys Processed by Metal Injection Molding. (2017) JOM, 69 (4), pp. 676-682.
• Iqbal, F., Pyczak, F., Neumeier, S., Göken, M.: Crack nucleation and elastic / plastic deformation of TiAl alloys investigated by in-situ loaded atomic force microscopy. (2017) Materials Science and Engineering A, 689, pp. 11-16.
• Amherd Hidalgo, A., Frykholm, R., Ebel, T., Pyczak, F.: Powder Metallurgy Strategies to Improve Properties and Processing of Titanium Alloys: A Review. (2017) Advanced Engineering Materials, . Article in Press.
• Rackel, M.W., Stark, A., Gabrisch, H., Schell, N., Schreyer, A., Pyczak, F.: Orthorhombic phase formation in a Nb-rich γ-TiAl based alloy – An in situ synchrotron radiation investigation. (2016) Acta Materialia, 121, pp. 343-351.
• Tankoua, A.T., Stark, A., Rackel, M.W., Pyczak, F., von Hehl, A.: In situ analysis of the forging process of a novel γ-TiAl alloy using synchrotron radiation [In situ Untersuchung des Schmiedeprozesses einer neuartigen γ-TiAl Legierung unter Verwendung von Synchrotronstrahlung]. (2016) Materialwissenschaft und Werkstofftechnik, 47 (11), pp. 1109-1120.
• Kolb, M., Wheeler, J.M., Mathur, H.N., Neumeier, S., Korte-Kerzel, S., Pyczak, F., Michler, J., Göken, M.: Local mechanical properties of the (β0+ω0) composite in multiphase titanium aluminides studied with nanoindentation at room and high temperatures. (2016) Materials Science and Engineering A, 665, pp. 135-140.
• Prashanth, K.G., Scudino, S., Chaubey, A.K., Löber, L., Wang, P., Attar, H., Schimansky, F.P., Pyczak, F., Eckert, J.: Processing of Al-12Si-TNM composites by selective laser melting and evaluation of compressive and wear properties. (2016) Journal of Materials Research, 31 (1), pp. 55-65.
• Soyama, J., Oehring, M., Limberg, W., Ebel, T., Kainer, K.U., Pyczak, F.: Sintering behaviour of Ti-45Al-5Nb-0.2B-0.2C alloy modifications by additions of elemental titanium and aluminium. (2015) Powder Metallurgy, 58 (5), pp. 369-375.
• Stark, A., Rackel, M., Tankoua, A.T., Oehring, M., Schell, N., Lottermoser, L., Schreyer, A., Pyczak, F.: In situ high-energy X-ray diffraction during hot-forming of a multiphase TiAl Alloy. (2015) Metals, 5 (4), pp. 2252-2265.
• Soyama, J., Oehring, M., Limberg, W., Ebel, ., Kainer, K.U., Pyczak, F.: The effect of zirconium addition on sintering behaviour, microstructure and creep resistance of the powder metallurgy processed alloy Ti-45Al-5Nb-0.2B-0.2C. (2015) Materials and Design, 84, pp. 87-94.
• Zhao, D., Chang, K., Ebel, T., Nie, H., Willumeit, R., Pyczak, F.: Sintering behavior and mechanical properties of a metal injection molded Ti-Nb binary alloy as biomaterial. (2015) Journal of Alloys and Compounds, 640, pp. 393-400.
• Wang, L., Gabrisch, H., Lorenz, U., Schimansky, F.-P., Schreyer, A., Stark, A., Pyczak, F.: Nucleation and thermal stability of carbide precipitates in high Nb containing TiAl alloys. (2015) Intermetallics, 66, art. no. 5703, pp. 111-119.
• Pyczak, F., Bauer, A., Göken, M., Lorenz, U., Neumeier, S., Oehring, M., Paul, J., Schell, N., Schreyer, A., Stark, A., Symanzik, F.: The effect of tungsten content on the properties of L12-hardened Co-Al-W alloys. (2015) Journal of Alloys and Compounds, 632, pp. 110-115.
• Wang, Z., Prashanth, K.G., Chaubey, A.K., Löber, L., Schimansky, F.P., Pyczak, F., Zhang, W.W., Scudino, S., Eckert, J.: Tensile properties of Al-12Si matrix composites reinforced with Ti-Al-based particles. (2015) Journal of Alloys and Compounds, 630, pp. 256-259.
• Salih, M.Z., Uhlarz, M., Pyczak, F., Brokmeier, H.-G., Weidenfeller, B., Al-Hamdany, N., Gan, W.M., Zhong, Z.Y., Schell, N.: The effect of magnetic annealing on crystallographic texture and magnetic properties of Fe-2.6% Si. (2015) Journal of Magnetism and Magnetic Materials, 381, pp. 350-359.
• Rackel, M., Stark, A., Gabrisch, H., Schimansky, F.-P., Schell, N., Schreyer, A., Pyczak, F.: In situ synchrotron radiation measurements of orthorhombic phase formation in an advanced TiAl alloy with modulated microstructure. (2015) Materials Research Society Symposium Proceedings, 1760, pp. 120-126.
• Bauer, A., Neumeier, S., Pyczak, F., Göken, M.:Influence of iridium on the properties of γ′-strengthened co-base superalloys. (2015) Advanced Engineering Materials, 17 (6), pp. 748-754.
• Wang, L., Gabrisch, H., Lorenz, U., Schimansky, F.-P., Stark, A., Pyczak, F.: Perovskite Ti<inf>3</inf>AlC carbide splitting in high Nb containing tial alloys. (2015) Materials Research Society Symposium Proceedings, 1760, pp. 31-36.
• Wang, L., Pyczak, F., Gabrisch, H., Lorenz, U., Münch, M., Schimansky, F.-P., Schreyer, A., Stark, A: Effects of carbon content, annealing condition and internal defects on the nucleation,
growth and coarsening of P-rype carbides in high niobium containing TiAl alloys. (2015) Materials Research Society Symposium Proceedings, 1760, pp. 61-66.
• Bolz, S., Oehring, M., Lindemann, J., Pyczak, F., Paul, J., Stark, A., Lippmann, T., Schrüfer, S., Roth-Fagaraseanu, D., Schreyer, A., Weiß, S.: Microstructure and mechanical properties of a forged β-solidifying γ TiAl alloy in different heat treatment conditions. (2015) Intermetallics, 58, pp. 71-83.
• Larráyoz Izcara, X., Guirao Blank, A., Pyczak, F., Staron, P., Schumann, S., Huber, N.: Characterization and modeling of the influence of artificial aging on the microstructural evolution of age-hardenable AlSi10Mg(Cu) aluminum alloys. (2014) Materials Science and Engineering A, 610, pp. 46-53.
• Imayev, V., Gaisin, R., Gaisina, E., Imayev, R., Fecht, H.-J., Pyczak, F.: Effect of hot forging on microstructure and tensile properties of Ti-TiB based composites produced by casting. (2014) Materials Science and Engineering A, 609, pp. 34-41.
• Stark, A., Oehring, M., Pyczak, F., Lippmann, T., Lottermoser, L., Schreyer, A.: The transformation mechanism of β phase to ω-related phases in Nb-rich γ-TiAl alloys studied by in situ high-energy X-ray diffraction. (2014) Materials Science Forum, 772, pp. 85-89.
• Jabbar, H., Monchoux, J.-P., Thomas, M., Pyczak, F., Couret, A.: Improvement of the creep properties of TiAl alloys densified by Spark Plasma Sintering. (2014) Intermetallics, 46, pp. 1-3.
• Löber, L., Schimansky, F.P., Kühn, U., Pyczak, F., Eckert, J.: Selective laser melting of a beta-solidifying TNM-B1 titanium aluminide alloy. (2014) Journal of Materials Processing Technology, 214 (9), pp. 1852-1860.
• Zhao, D., Chang, K., Ebel, T., Qian, M., Willumeit, R., Yan, M., Pyczak, F.: Titanium carbide precipitation in Ti-22Nb alloy fabricated by metal injection moulding. (2014) Powder Metallurgy, 57 (1), pp. 2-4.