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Influence of Annealing on the Properties of Explosively Welded Titanium Grade 1—AW7075 Aluminum Alloy Bimetals

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Abstract

Explosive welding of titanium Grade 1 to AW7075 aluminum alloy arranged in parallel setup was performed. The annealing of produced bimetals at the temperatures of 450, 500 and 550 °C for times ranging from 20 to 100 h was carried out after explosive welding. The produced bimetal was characteristic by its wavy interface typical for that bonding process. Increase in the microhardness at the interface was recorded due to work hardening. Delamination of titanium Grade 1 flyer sheet was firstly observed when annealing temperature of 500 °C for 40 h was carried out. Annealing at 550 °C also resulted in delamination of upper sheet. The intermetallic compound (IMC) layer was observed at the interface after annealing of bimetals. The higher the annealing temperature and time, the higher the thickness of continuous IMC layer. The maximum measured thickness of IMC layer averaged 13 µm. Energy dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD) analyses revealed that the interface layer is consisted of Al18Ti2Mg3 IMC. Microhardness at the interface increased dramatically up to 439 HV0.1 after annealing of bimetal due to the presence of above-mentioned IMC.

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Acknowledgments

The paper was prepared thanks to the financial assistance to VEGA grant agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic and the Slovak Academy of Sciences, Project No. 1/1010/16. The publication is also the result of the project implementation: CE for development and application of advanced diagnostic methods in processing of metallic and nonmetallic materials—APRODIMET, ITMS:26220120048, supported by the Research & Development Operational Programme funded by the ERDF.

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Authors and Affiliations

  1. Department of Welding and Foundry, Faculty of Materials Science and Technology in Trnava, Institute of Production Technologies, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24, Trnava, Slovak Republic

    Miroslav Sahul

  2. Faculty of Materials Science and Technology in Trnava, Institute of Materials Science, Slovak University of Technology in Bratislava, J. Bottu 25, 917 24, Trnava, Slovak Republic

    Martin Sahul, Ján Lokaj & L’ubomír Čaplovič

  3. OZM Research, s.r.o., Blížňovice 32, 538 62, Hrochův Týnec, Czech Republic

    Petr Nesvadba

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  1. Miroslav Sahul
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  2. Martin Sahul
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Correspondence to Miroslav Sahul.

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Sahul, M., Sahul, M., Lokaj, J. et al. Influence of Annealing on the Properties of Explosively Welded Titanium Grade 1—AW7075 Aluminum Alloy Bimetals. J. of Materi Eng and Perform 27, 5665–5674 (2018). https://doi.org/10.1007/s11665-018-3667-1

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  • DOI: https://doi.org/10.1007/s11665-018-3667-1

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