Lehrstuhl für Fertigungstechnologie, Universität Erlangen-Nürnberg

Layered Lightweight Materials with Functional Gradients

Project Status: finished


Within the second funding period of the Cluster of Excellence "Engineering of Advanced Materials" (EAM) the realization of property gradients in thickness direction of sheets using a laser heat treatment is analyzed in this project. This should lead to a reduction of delamination effects during forming operations of multilayered high-strength aluminum manufactured in the Accumulative Roll Bonding process. In combination with a local heat treatment over the plane according to the Tailored Heat Treated Blanks technology it is possible to generate materials with process-adapted property gradients in thickness direction and over the plane. In a first study regarding multilayered pure aluminum the realization of different property profiles over the sheet thickness using a Nd:YAG laser was analyzed depending on the laser parameters and different numbers of layers. In the figure below the influence of the laser power on the microhardness distribution of ARB processed sheets with six rolling cycles is shown exemplarily.



Research Groups



    • Degner, J.; Herrmann, J.; Junker, F.; Berendt, E.; Merklein, M.:
      Leichtbauwerkstoffe für den modernen Automobilbau.
      Zeitschrift Konstruktion 3(2018), pp. 50-54

    • Herrmann, J.; Merklein, M.:
      Improvement of deep drawability of ultra-fine grained 6000 series aluminum alloy by tailored heat treatment.
      Procedia Manufacturing 15(2018), pp. 976-983


    • Herrmann, J.; Merklein, M.:
      Herstellung und Umformeigenschaften hochfester mehrlagiger Aluminiumlegierungen der 6000er-Serie.
      In: Europäische Forschungsgesellschaft für Blechverarbeitung (Edtrs.): Energie / Effiziente Verarbeitung zukunftsweisender Leichtbauwerkstoffe, 2017, pp. 263-271

    • Herrmann, J.; Suttner, S.; Merklein, M.:
      Experimental investigation and numerical modeling of the bond shear strength of multi-layered 6000 series aluminum alloys.
      Procedia Engineering 183(2017)C, pp. 283-290


    • Merklein, M.; Herrmann, J.:
      Accumulative Roll Bonding of precipitation-hardenable aluminum alloys of the 6000 series in a warm rolling process.
      In: ASMET (Edtr.): Proc. ROLLING Conference, 2016, pp. 699-708

    • Merklein, M.; Graser, M.; Degner, J.; Lechner, M.; Herrmann, J.:
      Tailoring material properties in forming technology by a local heat treatment.
      In: Gronostajski, Z. (Edtr.): Advanced Metal Forming Processes in Automotive Industry, 2016, pp. 45-52

    • Merklein, M.; Herrmann, J.:
      Effect of a Local Laser Heat Treatment on the Formability of Multi-layered 6000 Series Aluminum Alloys.
      Physics Procedia 83(2016), pp. 560-567


    • Pellegrino, S.; Fratini, L.; Merklein, M.; Böhm, W.; Nguyen, H.:
      Modeling of the Plastic Characteristics of AA6082 for the Friction Stir Welding Process.
      Key Engineering Materials 639(2015), pp. 309-316

    • Böhm, W.; Merklein, M.; Lechner, M.:
      Innovative aluminium lightweight design by the combination of Accumulative Roll Bonding and local intermediate heat treatment.
      Materials Today: Proceedings 2(2015)10, pp. 4992–4997


    • Merklein, M.; Böhm, W.:
      Accumulative Roll Bonding: Forming Behavior, Tailored Properties and Upscaling Approach.
      Adv. Mater. Res. 907(2014), pp. 3-16

    • Böhm, W.; Merklein, M.:
      Manufacturing of high-strength aluminum sheet metal in the Accumulative Roll Bonding process.
      In: Liewald, M. (Edtr.): New Developments in Sheet Metal Forming, Werkstoff-Informationsgesellschaft, 2014, pp. 293-302

    • Böhm, W.; Merklein, M.:
      Laser-assisted property gradients in multi-layered aluminum.
      Physics Procedia 56(2014), pp. 1419–1426


    • Hagenah, H.; Böhm, W.; Breitsprecher, T.; Merklein, M.; Wartzack, S.:
      Modelling, Construction and Manufacture of a Lightweight Robot Arm.
      Procedia CIRP 12(2013), pp. 211-216

    • Fratini, L.; Merklein, M.; Böhm, W.; Campanella, D.:
      Modelling Aspects in Accumulative Roll Bonding process by Explicit Finite Element Analysis.
      Key Eng. Mater. 549(2013), pp. 452-459

    • Ruppert, M.; Böhm, W.; Nguyen, H.; Höppel, H. W.; Merklein, M.; Göken, M. :
      Influence of upscaling accumulative roll bonding on the homogeneity and mechanical properties of AA1050A.
      J. Mat. Science 48(2013)24, pp. 8377-8385


    • Maier, V.; Hausöl, T.; Schmidt, C. W.; Böhm, W.; Nguyen, H.; Merklein, M.; Höppel, H. W.; Göken, M.:
      Tailored Heat-treated Accumulative Roll Bonded Aluminum Blanks: Microstructure and Mechanical Behavior.
      Metallurgical and Materials Transactions A 43(2012)9, pp. 3097-3107

    • Hausöl, T.; Schmidt, C. W.; Maier, V.; Böhm, W.; Nguyen, H.; Merklein, M.; Höppel, H. W.; Göken, M.:
      Formability of Ultrafine-Grained AA6016 Sheets Processed by Accumulative Roll Bonding.
      Key Eng. Mater. 504-506(2012), pp. 575-580


    • Merklein, M.; Biasutti, M.; Nguyen, H.; Böhm, W.:
      Flow Behaviour of Advanced Aluminium Materials.
      In: Hirt, G.; Tekkaya, E.A. (Edtrs.): Steel research international: Special Edition: 10th International Conference on Technology of Plasticity, Wiley-VCH Verlag GmbH&Co. KGaA, 2011, pp. 1066-1071

    Letztes Update: 04.07.2018