TY - JOUR

T1 - Investigating the Influence of Process Parameters on the Mechanical Properties of Extruded Aluminum Tubes by Cyclic Indentation Tests

AU - Görzen, David

AU - Schäfke, Florian Patrick

AU - Blinn, Bastian

AU - Klose, Christian

AU - Maier, Hans Jürgen

AU - Beck, Tilmann

N1 - Funding Information: This research was funded by the German Research Foundation (DFG) through the project ?Aluminium alloys with controlled melting ranges for process-integrated foaming during extrusion?, grant number 324394568. Additional funding of the research through the program ?MOBILISE? by the Ministry of Science and Culture (MWK) of the State of Lower Saxony and financial support of the priority research activity of Rhineland Palatinate ?Advanced Materials Engineering (AME)? are gratefully acknowledged.

PY - 2021/4/30

Y1 - 2021/4/30

N2 - Given the complex process condition, extruded aluminum (Al) alloy tubes show locally pronounced differences in microstructure and mechanical properties, which can be influenced by subsequent heat treatment. In the present study, cyclic indentation tests (CITs) were conducted on extruded Al alloy EN AW-6082 to locally determine hardness and cyclic hardening potential, which was complemented with light optical microscopy. To analyze the influence of extrusion process and subsequent heat treatment, the EN AW-6082 tubes investigated were manufactured with extrusion ratios Ψ of 13:1 and 22:1, both in as-extruded and T6 heat-treated conditions. The results obtained for the as-extruded state showed significant differences of the local mechanical properties and demonstrated that an increased Ψ leads to higher hardness, caused by more pronounced plastic deformation during the manufacturing process. Moreover, an increase of hardness and cyclic hardening potential was observed after a T6 heat treatment, which also reduced the difference in hardness between the different extrusion ratios. Additionally, the pronounced local differences in hardness and cyclic hardening potential correlated with the local microstructure. The results demonstrated that CITs enable the analysis of local mechanical properties of extruded EN AW-6082 profiles, resulting from different extrusions ratios as well as subsequent heat treatment.

AB - Given the complex process condition, extruded aluminum (Al) alloy tubes show locally pronounced differences in microstructure and mechanical properties, which can be influenced by subsequent heat treatment. In the present study, cyclic indentation tests (CITs) were conducted on extruded Al alloy EN AW-6082 to locally determine hardness and cyclic hardening potential, which was complemented with light optical microscopy. To analyze the influence of extrusion process and subsequent heat treatment, the EN AW-6082 tubes investigated were manufactured with extrusion ratios Ψ of 13:1 and 22:1, both in as-extruded and T6 heat-treated conditions. The results obtained for the as-extruded state showed significant differences of the local mechanical properties and demonstrated that an increased Ψ leads to higher hardness, caused by more pronounced plastic deformation during the manufacturing process. Moreover, an increase of hardness and cyclic hardening potential was observed after a T6 heat treatment, which also reduced the difference in hardness between the different extrusion ratios. Additionally, the pronounced local differences in hardness and cyclic hardening potential correlated with the local microstructure. The results demonstrated that CITs enable the analysis of local mechanical properties of extruded EN AW-6082 profiles, resulting from different extrusions ratios as well as subsequent heat treatment.

KW - Cyclic hardening potential

KW - Cyclic indentation test

KW - Extruded Al tubes

KW - PhyBaL

UR - http://www.scopus.com/inward/record.url?scp=85138051321&partnerID=8YFLogxK

U2 - 10.3390/met11050744

DO - 10.3390/met11050744

M3 - Article

AN - SCOPUS:85138051321

VL - 11

JO - Metals

JF - Metals

SN - 2075-4701

IS - 5

M1 - 744

ER -