M.Sc. Alexander Koch

15) Sarafraz, Y.; Brink, M.; Baak, N.; Koch, A.; Walther, F.:
Influence of pre-deformation on fatigue life of high strength steels by means of micromagnetic Barkhausen noise.
Materials Testing 65 (5), (2023) 641-651. https://doi.org/10.1515/mt-2022-0425

14) Sarafraz, Y.; Stammkötter, S; Koch, A.; Walther, F.:
Dimension-based failure analysis of formed internal threads in AlSi10Mg cast profiles using coupled DT/NDT testing methods.
Procedia Structural Integrity 42 (2022) 125-132. https://doi.org/10.1016/j.prostr.2022.12.015 - Download

13) Sarafraz, Y.; Koch, A.; Felinks, N.; Biermann, D.; Walther, F.:
Influence of pre-drilling on hardness and tensile failure of formed internal threads in thin-walled AZ91 cast alloys.
Engineering Failure Analysis 130, 105783 (2021) 1-14. https://doi.org/10.1016/j.engfailanal.2021.105783

12) Koch, A.; Henkel, T.; Walther, F.:
Mechanism-oriented characterization of the anisotropy of extruded profiles based on solid-state recycled EN AW-6060 aluminum chips.
Engineering Failure Analysis 121, 105099 (2021) 1-9. https://doi.org/10.1016/j.engfailanal.2020.105099

11) Koch, A.; Ursinus, J.; Behrens, B.-A.; Walther, F.:
Computed tomography-based defect characterization and prediction of fatigue properties of extrudates from recycled field-assisted sintered EN AW-6082 aluminium chips.
Fatigue 2021, Proceedings of the 8th Engineering Integrity Society International Conference on Durability and Fatigue, (2021) 170-182.

10) Timmermann, A.; Abdulgader, M.; Hagen, L.; Koch, A.; Wittke, P.; Biermann, D.; Tillmann, W.; Walther, F.:
Effect of machine hammer peening on the surface integrity of a ZnAl-based corrosion protective coating.
MATEC Web of Conferences 318 (4), 1008 (2020) 1-6. https://doi.org/10.1051/matecconf/202031801008 - Download

9) Koch, A.; Bonhage, M.; Teschke, M.; Lücker, L.; Behrens, B.-A.; Walther, F.:
Electrical resistance-based fatigue assessment and capability prediction of extrudates from recycled field-assisted sintered EN AW-6082 aluminium chips.
Materials Characterization 169, 110644 (2020) 1-8. https://doi.org/10.1016/j.matchar.2020.110644

8) Grätzel, M.; Bergmann, J. P.; Chehreh, A. B.; Koch, A.; Walther, F.:
Einfluss des Verhältnisses aus Drehrichtung und Geschwindigkeit am FSW-Werkzeug auf die Ermüdungsfestigkeit von Al-Legierungen.
1. Schweißen und Schneiden 72 (2020) 558-565.
2. DVS Congress, Proceedings of the DVS Congress 2020 (2020) 608-615.

7) Teschke, M.; Koch, A.; Walther, F.:
Comparison of high-temperature compression and compression-compression fatigue behavior of magnesium alloys DieMag422 and AE42.
Materials 13 (3), 497 (2020) 1-15. https://doi.org/10.3390/ma13030497 - Download

6) Koch, A.; Wittke, P.; Walther, F.:
Computed tomography-based characterization of the fatigue behavior and damage development of extruded profiles made from recycled AW6060 aluminum chips.
Materials 12 (15), 2372 (2019) 1-17. https://doi.org/10.3390/ma12152372 - Download

5) Koch, A.; Henkel, T.; Walther, F.:
Characterization of the anisotropy of extruded profiles based on recycled AW6060 aluminum chips.
ICSID 2019, Proceedings of the 3rd International Conference on Structural Integrity and Durability (2019) 1-5.

4) Koch, A.; Wittke, P.; Walther, F.:
Characterization of the fatigue and damage behavior of extruded AW6060 aluminum chip profiles.
Structural Integrity 7 - Mechanical Fatigue of Metals: Experimental and Simulation Perspectives, Editors: Correia, J.; De Jesus, A.; Fernandes, A.; Calçada, R., Springer, Cham, ISBN 978-3-030-13979-7 (2019) 11-17. https://doi.org/10.1007/978-3-030-13980-3_2

3) Tenkamp, J.; Bleicher, K.; Klute, S. Chrzan, K.; Koch, A.; Walther, F.:
Advanced characterization of the cyclic deformation and damage behavior of Al-Si-Mg cast alloys using hysteresis analysis and alternating current potential drop method.
Light Metals 2019, Hrsg.: C. Chesonis, Springer, ISBN 978-3-030-05864-7 (2019) 167-175. https://doi.org/10.1007/978-3-030-05864-7

2) Tenkamp, J.; Koch, A.; Knorre, S.; Krupp, U.; Michels, W.; Walther, F.:
Influence of the microstructure on the cyclic stress-strain behaviour and Fatigue life in hypo-eutectic Al-Si-Mg cast alloys.
Fatigue 2018, Matec Web of Conferences 165, 15004 (2018) 1-8. https://doi.org/10.1051/matecconf/201816515004

1) Tenkamp, J.; Koch, A.; Knorre, S.; Krupp, U.; Michels, W.; Walther, F.:
Defect-correlated fatigue assessment of A356-T6 aluminum cast alloy using computed tomography based Kitagawa-Takahashi diagrams.
International Journal of Fatigue 108 (2018) 25-34. https://doi.org/10.1016/j.ijfatigue.2017.11.003

List of all publications

14) Koch, A. (Sp.); Ursinus, J.; Walther, F.:
Influence of sintering time and temperature on microstructure and mechanical properties of solid-state recycled EN AW-6060 aluminum chips.
5. Symposium Materialtechnik des Clausthaler Zentrums für Materialtechnik, Clausthal-Zellerfeld, 23.-24. Feb. (2023).

13) Sarafraz, Y. (Sp.); Stammkötter, S.; Koch, A.; Walther, F.:
Dimension-based failure analysis of formed internal threads in AlSi10Mg cast profiles using coupled DT/NDT testing methods.
ECF23 - 23rd European Conference on Fracture 2022, Funchal, Madeira, Portugal, 27. June-01. July (2022).

12) Koch, A.; Kalenborn, A.; Baak, N.; Tenkamp, J.; Walther, F. (Sp.):
Coupled characterization approaches for fatigue assessment of high-strength steel and light metal alloy structures.
TMS 2022 Annual Meeting & Exhibition, Web Conference, 27. Feb.-03. Mar. (2022).

11) Koch, A. (Sp.); Laskowski, S.; Walther, F.:
Process-related die design assessment on microstructure and mechanical behavior of profiles from directly recycled hot extruded EN AW-6060 aluminum chips.
TMS 2022 Annual Meeting & Exhibition, Web Conference, 27. Feb.-03. Mar. (2022).

10) Sarafraz, Y. (Sp.); Koch, A.; Walther, F.:
Influence of pre-drilling diameter on fatigue behavior of internal threads manufactured by friction drilling and thread forming in AZ91 alloy.
LightMAT 2021, 4th International Conference on Light Materials - Science and Technology, Web Conference, 02.-04. Nov. (2021).

9) Koch, A. (Sp.); Ursinus, J.; Behrens, B.-A.; Walther, F.:
Computed tomography-based defect characterization and prediction of fatigue properties of extrudates from recycled field-assisted sintered EN AW-6082 aluminium chips.
Fatigue 2021, 8th Engineering Integrity Society International Conference on Durability & Fatigue, Web Conference, 29.-31. Mar. (2021).

8) Koch, A. (Sp.); Henkel, T.; Walther, F.:
Characterization of the anisotropy of extruded profiles based on recycled AW6060 aluminum chips.
ICSID 2019, 3rd International Conference on Structural Integrity and Durability, Dubrovnik, Croatia, 04.-07. June (2019).

7) Tenkamp, J. (Sp.); Bleicher, K.; Klute, S. Chrzan, K.; Koch, A.; Walther, F.:
Advanced characterization of the cyclic deformation and damage behavior of Al-Si-Mg cast alloys using hysteresis analysis and alternating current potential drop method.
TMS 2019 Annual Meeting & Exhibition, San Antonio, TX, USA, 10.-14. Mar. (2019).

6) Koch, A. (Sp.); Wittke, P.; Walther F.:
Characterization of the fatigue and damage behavior of extruded AW6060 aluminum chip profiles.
ICMFM19, XIX International Colloquium on Mechanical Fatigue of Metals, Porto, Portugal, 05.-07. Sept. (2018).

5) Tenkamp, J. (Sp.); Koch, A.; Knorre, S.; Krupp, U.; Michels, W.; Walther, F.:
Influence of the microstructure on the cyclic stress-strain behaviour and fatigue life in hypo-eutectic Al-Si-Mg cast alloys.
Fatigue 2018, 12th International Fatigue Congress, Poitiers, France, 27. May-1. June (2018).

4) Tenkamp, J. (Sp.); Koch, A.; Knorre, S.; Krupp, U.; Michels, W.; Walther, F.:
Identifikation und Modellierung der Schädigungsmechanismen in Al-Si-Mg-Gusslegierungen im HCF- und VHCF-Bereich.
DGM-FA Aluminium, AK Schädigungsmechanismen in Al-Produkten, TRIMET Aluminium SE, Essen, 25. Apr. (2018).

3) Koch, A. (Sp.); Wittke, P.; Walther, F.:
Computertomografisch unterstützte Charakterisierung des Ermüdungsverhaltens von Späne-Strangpressprofilen der AlMgSi0,5-Legierung.
DGM-FA Aluminium, AK Schädigungsmechanismen in Al-Produkten, TRIMET Aluminium SE, Essen, 25. Apr. (2018).

2) Tenkamp, J. (Sp.); Koch, A.; M.; Knorre, S.; Krupp, U.; Michels, W.; Walther, F.:
Einfluss der Mikrostruktur auf das zyklische Spannungs-Dehnungs-Verhalten und die Lebensdauer der Aluminiumgusslegierung EN AC-AlSi7Mg0,3.
DGM/DVM-AG Materialermüdung, KME Germany GmbH & Co.KG, Osnabrück, 12.-13. Apr. (2018).

1) Koch, A. (Sp.); Tenkamp, J.; Walther, F. Knorre, S.; Krupp, U.; Michels, W.:
Mikrostrukturkorrelierte Charakterisierung des zyklischen Verformungs- und Schädigungsverhaltens der Aluminiumgusslegierung EN AC-AlSi7Mg0,3.
DGM/DVM-AK Materialermüdung, Universität Duisburg-Essen, Duisburg, 16.-17. März (2017).

List of all presentations