Project Leader: Reinhard Pippan
Background
The theoretical strength of metals and ceramics is about 10% of their Young’s modulus. Although whiskers reach strength values close to this limit but they cannot be used in the design of load bearing structures. Currently the typical strength of the structural materials in use is only in the range of few % of this theoretical limit. Premature plastic deformation and failure due to flaws are the main reasons for this distinctive lower limit. For engineering applications, adequate fracture toughness is required which permits a ductile behaviour and certain strength even in the presence of flaws or cracks. The strength of the strongest metallic materials is only 10 % of the theoretical limit. Increasing the strength of metallic high strength materials by a few percent is usually associated with an unacceptable decrease in fracture toughness and results in a very flaw sensitive strength similar to that known for ceramics. In pearlitic steel wires it was possible to overcome this 10% limitation significantly. In the last years for the first time a strength of 6.3 GPa was obtained for this material which is about 30% of the theoretical limit or 3 times stronger than other high strength steels. The group of the PI has shown that these wires have an exceptional toughness equivalent to a high damage tolerance. The proposed ERC-grant should permit the analysis of the phenomena for this superior combination of strength and ductility. The knowledge of the essential required architectural features of this nano-composite and the necessary properties of the individual phases as well as their interfaces will be used to design nano-architectures also in other materials to obtain such exceptional properties. The developed skill in the generation of nano-composites from coarse constituents will be used for the production of similar nano-composites, the proof of developed concepts, and the generation of new ultra strong materials.
Publications
PhD-theses
- Deformation-induced supersaturation of immiscible binary systems. Kormout, K.(2016) Doktorarbeit (link to pdf)
- Recovery phenomena in severely deformed metals. Renk, O.(2015) Doktorarbeit(link to pdf)
- Fatigue crack growth of noncrystalline and ultrafine-grained metals processed by severe plastic deformation. Leitner, T.(2017) Doktorarbeit (link to pdf)
- Structural Instabilities in Nanostructured Metals. Kapp, M.(2017) Doktorarbeit (link to pdf)
- Processing - Structure - Property Relationships in Selected Iron-Based Nanostructures". Müller, T.(2018) Doktorarbeit (link to pdf)
- Production and characterization of particle-stabilized nanocrystalline Cu for high temperature applications. Krämer, L.(2014) Doktorarbeit (link to pdf)
2018
Leitner, T.; Sackl, S.; Voelker, B.; Riedl, H.; Clemens, H.; Pippan, R; Hohenwarter, A; Crack path identification in a nanostructured pearlitic steel using atom probe tomography
SCRIPTA MATERIALIA Volume: 142 Pages: 66-69 Published: JAN 1 2018
Tian, Y. Z.; Gao, S.; Zhao, L. J.; Lu, S; Pippan, R; Zhang, ZF; Tsuji, N; Remarkable transitions of yield behavior and Luders deformation in pure Cu by changing grain sizes
SCRIPTA MATERIALIA Volume: 142 Pages: 88-91 Published: JAN 1 2018
Mueller, Timo; Grimwood, Joseph; Bachmaier, Andrea; Schoeber, Thomas; Pippan, Reinhard;
Electrodeposition of Fe-C Alloys from Citrate Baths: Structure, Mechanical Properties, and Thermal Stability
METALS Volume: 8 Issue: 5 Article Number: 363 Published: MAY 2018
Dimic, Ivana; Cvijovic-Alagic, Ivana; Hohenwarter, Anton; Pippan, Reinhard; Kojic, Vesna; Bajat, Jelena; Rakin, M.;
Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS Volume: 106 Issue: 3 Pages: 1097-1107 Published: APR 2018
Guo, Jinming; Haberfehlner, Georg; Rosalie, Julian; Li, Lei; Duarte, Maria Jazmin; Kothleitner, Gerald; Dehm, Gerhard; He, Yunbin; Pippan, Reinhard; Zhang, Zaoli; In situ atomic-scale observation of oxidation and decomposition processes in nanocrystalline alloys
NATURE COMMUNICATIONS Volume: 9 Article Number: 946 Published: MAR 5 2018
Kraemer, Lisa; Champion, Yannick; Kormout, Karoline S.; Maier-Kiener, Verena ; Pippan, Reinhard
Bulk metallic dual phase glasses by severe plastic deformation
INTERMETALLICS Volume: 94 Pages: 172-178 Published: MAR 2018
Mueller, Timo; Bachmaier, Andrea; Konetschnik, Ruth; et al.; Mechanical properties of electrodeposited amorphous/crystalline multilayer structures in the Fe-P system
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 715 Pages: 83-91 Published: FEB 7 2018
Leitner, T.; Trummer, G.; Hohenwarter, A,; Pippan, R.; Influence of severe plastic deformation and specimen orientation on the fatigue crack propagation behavior of a pearlitic steel
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 710 Pages: 260-270 Published: JAN 5 2018
Kraemer, Lisa; Maier-Kiener, Verena; Champion, Yannick; Sarac, Baran; Pippan, Reinhard;
Activation volume and energy of bulk metallic glasses determined by nanoindentation
MATERIALS & DESIGN Volume: 155 Pages: 116-124 Published: OCT 5 2018
Renk, O.; Pippan, R.
Transition from thermally assisted to mechanically driven boundary migration and related apparent activation energies
SCRIPTA MATERIALIA Volume: 154 Pages: 212-215 Published: SEP 2018
Kormout, K. S.; Ghosh, P.; Bachmaier, A.; Hohenwarter, A; Pippan, R;
Effect of processing temperature on the microstructural characteristics of Cu-Ag nanocomposites: From supersaturation to complete phase decomposition
ACTA MATERIALIA Volume: 154 Pages: 33-44 Published: AUG 1 2018
Hohenwarter, Anton; Pippan, Reinhard
Introduction of Planar High Pressure Torsion (P-HPT) for Fabrication of Nanostructured Sheets
ADVANCED ENGINEERING MATERIALS Volume: 20 Issue: 7 Article Number: 1800050 Published: JUL 2018
2017
Kapp, Marlene Walpurga; Renk, Oliver; Leitner, Thomas; Pippan, Reinhard; Cyclically induced grain growth within shear bands investigated in UFG Ni by cyclic high pressure torsion
JOURNAL OF MATERIALS RESEARCH Volume: 32 Issue: 23 Pages: 4317-4326 Published: DEC 14 2017
Bachmaier, A.; Krenn, H.; Knoll, P.; Pippan, R.; JOURNAL OF ALLOYS AND COMPOUNDS Volume: 725 Pages: 744-749 Published: NOV 25 2017
Zhang, Zaoli; Guo, Jinming; Dehm, Gerhard; Pippan, Reinhard;
In-situ tracking the structural and chemical evolution of nanostructured CuCr alloys
ACTA MATERIALIA Volume: 138 Pages: 42-51 Published: OCT 1 2017
Leitner, Thomas; Pillmeier, Simon; Kormout, Karoline S., Hohenwarter A., Pippan R.; Simultaneous enhancement of strength and fatigue crack growth behavior of nanocrystalline steels by annealing
SCRIPTA MATERIALIA Volume: 139 Pages: 39-43 Published: OCT 2017
Schwarz, K. T.; Kormout, K. S.; Hohenwarter, A. Pippan, R.;
Impact of severe plastic deformation on microstructure and fracture toughness evolution of a duplex-steel
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 703 Pages: 173-179 Published: AUG 4 2017
Renk, O.; Ghosh, P.; Pippan, R., Generation of extreme grain aspect ratios in severely deformed tantalum at elevated temperatures
SCRIPTA MATERIALIA Volume: 137 Pages: 60-63 Published: AUG 2017
Rosalie, Julian M.; Guo, Jinming; Pippan, Reinhard; et al.; On nanostructured molybdenum-copper composites produced by high-pressure torsion
JOURNAL OF MATERIALS SCIENCE Volume: 52 Issue: 16 Pages: 9872-9883 Published: AUG 2017
Kraemer, Lisa; Champion, Yannick; Pippan, Reinhard; From powders to bulk metallic glass composites
SCIENTIFIC REPORTS Volume: 7 Article Number: 6651 Published: JUL 27 2017
Leitner, Thomas; Sabirov, I., Echat; Pippan, Reinhard; et al.; The effect of severe grain refinement on the damage tolerance of a superelastic NiTi shape memory alloy
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS Volume: 71 Pages: 337-348 Published: JUL 2017
Guo, Jinming; Rosalie, Julian M.; Pippan, Reinhard; et al.; MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 695 Pages: 350-359 Published: MAY 17 2017
Guo, Jinming; Rosalie, Julian; Pippan, Reinhard; et al.; On the phase evolution and dissolution process in Cu-Cr alloys deformed by high pressure torsion
SCRIPTA MATERIALIA Volume: 133 Pages: 41-44 Published: MAY 2017
Kormout, Karoline Sophie; Pippan, Reinhard; Bachmaier, Andrea; Deformation-Induced Supersaturation in Immiscible Material Systems during High-Pressure Torsion
ADVANCED ENGINEERING MATERIALS Volume: 19 Issue: 4 Special Issue: SI Article Number: UNSP 1600675 Published: APR 2017
Pippan, R.; Hohenwarter, A.; Fatigue crack closure: a review of the physical phenomena
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES Volume: 40 Issue: 4 Pages: 471-495 Published: APR 2017
Leitner, Thomas; Hohenwarter, Anton; Ochensberger, Walter; et al.; Fatigue crack growth anisotropy in ultrafine-grained iron
ACTA MATERIALIA Volume: 126 Pages: 154-165 Published: MAR 2017
Kormout, K. S.; Ghosh, P.; Maier-Kiener, V.; et al.; Deformation mechanisms during severe plastic deformation of a Cu-Ag composite. JOURNAL OF ALLOYS AND COMPOUNDS Volume: 695 Pages: 2285-2294 Published: FEB 25 2017
Kapp, M. W.; Kremmer, T.; Motz, C.; et al.; Structural instabilities during cyclic loading of ultrafine-grained copper studied with micro bending experiments. ACTA MATERIALIA Volume: 125 Pages: 351-358 Published: FEB 15 2017
Ghosh, P.; Renk, O.; Pippan, R.; Microtexture analysis of restoration mechanisms during high pressure torsion of pure nickel
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 684 Pages: 101-109 Published: JAN 27 2017
Ghosh, P.; Kormout, K. S.; Pippan, R., Role of interfaces on microstructure refinement and mechanical properties of severe plastically deformed copper and copper-silver eutectic
Book Group Author(s): IOP
Conference: 38th Riso International Symposium on Materials Science Location: Riso, DENMARK Date: SEP 04-08, 2017
38TH RISO INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE Book Series: IOP Conference Series-Materials Science and Engineering Volume: 219 Article Number: UNSP 012021 Published: 2017
Hohenwarter, A.; Kapp, M. W.; Voelker, B.; Pippan, R..; Strength and ductility of heavily deformed pearlitic microstructures
Book Group Author(s): IOP
Conference: 38th Riso International Symposium on Materials Science Location: Riso, DENMARK Date: SEP 04-08, 2017
38TH RISO INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE Book Series: IOP Conference Series-Materials Science and Engineering Volume: 219 Article Number: UNSP 012003 Published: 2017
Renk, O.; Ghosh, P.; Pippan, R.; From an understanding of structural restoration mechanisms towards a selective processing of extreme nanolamellar structures
Book Group Author(s): IOP
Conference: 38th Riso International Symposium on Materials Science Location: Riso, DENMARK Date: SEP 04-08, 2017
38TH RISO INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE Book Series: IOP Conference Series-Materials Science and Engineering Volume: 219 Article Number: UNSP 012037 Published: 2017
Katzenstenier, Andreas; Aristizabal, Katherine; Suzrez, Sebastian; Pippan, Reinhard, Andrea Bachmaier; Temperature dependent structural evolution in nickel/carbon nanotube composites processed by high-pressure torsion
Edited by: Liao, X; Estrin, Y
Conference: 7th International Conference on Nanomaterials by Severe Plastic Deformation Location: Sydney, AUSTRALIA Date: JUL 02-07, 2017
7TH INTERNATIONAL CONFERENCE ON NANOMATERIALS BY SEVERE PLASTIC DEFORMATION Book Series: IOP Conference Series-Materials Science and Engineering Volume: 194 Article Number: UNSP 012019 Published: 2017
Kormout, K. S.; Ghosh, P.; Maier-Kiener, V.; Pippan, R; Deformation mechanisms during severe plastic deformation of a Cu-Ag composite.
JOURNAL OF ALLOYS AND COMPOUNDS Volume: 695 Pages: 2285-2294 Published: FEB 25 2017
2016
Mueller, Timo; Bachmaier, Andrea; Neubaue, Erich; Kitzmantel, Michael; Pippan, Reinhard;
Strong and Stable Nanocomposites Prepared by High-Pressure Torsion of Cu-Coated Fe Powders
METALS Volume: 6 Issue: 10 Article Number: 228 Published: OCT 2016
Hohenwarter, A.; Voelker, B.; Kapp, M. W.; Li, Y; Goto, S; Raabe, D; Pippan, R;
Ultra-strong and damage tolerant metallic bulk materials: A lesson from nanostructured pearlitic steel wires
SCIENTIFIC REPORTS Volume: 6 Article Number: 33228 Published: SEP 14 2016
Kotzurek, Jaromir A.; Steyskal, Eva-Maria; Oberdorfer, Bernd; Hohenwarter, Anton; Pippan, Reinhard; Sprengel, Wolfgang; Wuerschum, Roland;
Direct measurement of vacancy relaxation by dilatometry
APPLIED PHYSICS LETTERS Volume: 109 Issue: 2 Article Number: 021906 Published: JUL 11 2016
Edalati, Kaveh; Lee, Dong Jun; Nagaoka, Takashi; Arita, Makoto; Kim, Hyoung Seop; Horita, Zenji; Pippan, Reinhard;
Real Hydrostatic Pressure in High-Pressure Torsion Measured by Bismuth Phase Transformations and FEM Simulations
MATERIALS TRANSACTIONS Volume: 57 Issue: 4 Pages: 533-538 Published: APR 2016
Kapp, M. W.; Hohenwarter, A.; Wurster, S.; Yang, B; Pippan, R.;
Anisotropic deformation characteristics of an ultrafine- and nanolamellar pearlitic steel
ACTA MATERIALIA Volume: 106 Pages: 239-248 Published: MAR 2016
Pippan, R.; Hohenwarter, A., The importance of fracture toughness in ultrafine and nanocrystalline bulk materials.
MATERIALS RESEARCH LETTERS Volume: 4 Issue: 3 Pages: 127-136 Published: 2016
2015
Hohenwarter, A.; Pippan, R.
Fracture and fracture toughness of nanopolycrystalline metals produced by severe plastic deformation.
Philos. Trans. R. Soc. A-Math. Phys. Eng. Sci., Bd. 373 (2015), S. ARTN 20140366.
Schuh, B.; Mendez-Martin, F.; Voelker, B.; George, E. P.; Clemens, H. Pippan, R.; Hohenwarter, A.;
Mechanical properties, microstructure and thermal stability of a nanocrystalline CoCrFeMnNi high-entropy alloy after
severe plastic deformation. Acta Mater., Bd. 96 (2015) S. 258-268
Kapp, M.W.; Kirchlechner, C.; Pippan, R.; Dehm, G. Importance of dislocation pile-ups on the mechanical properties and the Bauschinger effect in microcantilevers.
Journal of Materials Research 30 (2015)) S. 791-797.
Kormout, K. S.; Yang, B.; Pippan, R.
Deformation Behavior and Microstructural Evolution of Cu-Ag Alloys Processed by High-Pressure Torsion.
Adv. Eng. Mater., Bd. 17 (12) (2015) S. 1828-1834.
Kraemer, L.; Kormout, K. S.; Setman, D.; Champion, Y.; Pippan, R.
Production of Bulk Metallic Glasses by Severe Plastic Deformation.
METALS, Bd. 5 (2) (2015) S. 720-72
Leitner, T.; Hohenwarter, A.; Pippan, R.
Revisiting fatigue crack growth in various grain size regimes of Ni.
Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., Bd. 646 (2015) S. 294-305.
Maier, V.; Hohenwarter, A.; Pippan, R.; Kiener, D.
Thermally activated deformation processes in body-centered cubic Cr - How microstructure influences strain-rate sensitivity.
Scr. Mater., Bd. 106 (2015) S. 42-45.
Maier, V.; Leitner, A.; Pippan, R.; Kiener, D.
Thermally Activated Deformation Behavior of ufg-Au: Environmental Issues During Long-Term and High-Temperature Nanoindentation Testing.
JOM, Bd. 67 (2015) S. 2934-2944.
Renk, O.; Hohenwarter, A.; Schuh, B.; Li, J. H.; Pippan, R.
Hardening by annealing: insights from different alloys.
LTD, IOP PUBLISHING (Hrsg.) (36TH RISO INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE); Riso (2015).
2014
Leitner T., Hohenwarter A., Pippan R.
Fatigue crack growth behavior of ultrafine-grained nickel produced by high pressure torsion.
Procedia Materials Science 3, (2014) 1044-1049.
Renk O., Hohenwarter A., Wurster S., Pippan R.
Direct evidence for grain boundary motion as the dominant restoration mechanism in the steady-state regime of extremely cold-rolled copper.
Acta Materialia 77, (2014) 401-410.
Sauvage X., Champion Y., Pippan R., Cuvilly F., Perrie`re L., Akhatova A., Renk O.
Structure and properties of a nanoscaled composition modulated metallic glass.
Journal of Materials Science 49, (2014) 5640-5645.