SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.6: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

developing high-hardness, high-electrical conductivity and gradient structure of bulk Al-2.5Fe alloy by a new severe plastic deformation: high pressure torsion extrusion — •Rui Xu — Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany

The effect of High Pressure Torsion Extrusion (HPTE) on microstructure, hardness and electrical conductivity has been investigated in the bulk Al-2.5Fe alloy. The equivalent strain accumulated in the samples after one pass of HPTE varied in a wide range between 0.9 and 24.8, depending on the processing parameters. HPTE led to the formation of a gradient microstructure in which the grain and Al6Fe intermetallic size decreased by increasing the distance from the central axis of the samples. With increasing the equivalent strain, which is below 5.7, the microhardness and the electrical conductivity simultaneously increased, from 53.7 HV to 87 HV, from 38% IACS to 47% IACS respectively. This can be attributed to the grain size and Al6Fe intermetallic size decreased. When the equivalent strain gradually increased to 24.8, the microhardness continuously increased from 87 Hv to 126 Hv, the electrical conductivity decreased from 47% IACS to 43% IACS. This is contributed to the grain and Al6Fe intermetallic transformed into nanometer size, which significantly increased the microhardness, and some Fe atoms into Al matrix, which decreased the electrical conductivity. The High Pressure Torsion Extrusion process can lead to gradient microstructure and simultaneously increase the microhardness and the electrical conductivity of bulk Al-2.5Fe alloy..