Regensburg 2019 – wissenschaftliches Programm
MM 5.1: Vortrag
Montag, 1. April 2019, 10:15–10:30, H46
Grain structure and mechanical properties of the Cu-Al hybrid materials processed by High Pressure Torsion Extrusion — Dayan Nugmanov, Roman Kulagin, Horst Hahn, and •Yulia Ivanisenko — Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
A comparative analysis of the microstructure and mechanical properties of Cu-Al hybrid samples with three different geometry configurations processed by High Pressure Torsion Extrusion (HPTE) had been performed. The HPTE technique allows to achieve large strains (up to 30) during just one pass in large-scale rod specimens with the diameter of 10 mm and the length of 35 mm. Room temperature tensile tests had shown an interesting two-stage mechanical behavior correspondent to the Cu-matrix and Al-wires tension processes. It was found that Al wires embedded in the ultrafinegrained (grain size less than one micrometer) Cu matrix got thinned as a result of HPTE, upon that wire thickness depends on its distance from the sample center. In specimen areas corresponding to the middle-radius initially one mm in diameter wires were thinned to the tapes with the thickness of 20-30 micrometers, whereas in the edge areas their thickness was two-three micrometers, which reflects the strain gradient at HPTE.