Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 50: Mechanical properties III - Evolution & deformation of microstructure

MM 50.5: Talk

Thursday, April 3, 2014, 11:15–11:30, IFW B

Mechanical alloying of Cu50Ta50 produced by high pressure torsion — •Nazar Ibrahim, Martin Peterlechner, Sergiy Divinski, and Gerhard Wilde — Institute of Materials Physics, Westfälische Wilhelms-University Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

Mechanical alloying (MA) is generally considered as a solid-state powder processing technique, which involves repeated cold welding, fracturing and re-welding of powder particles in a high-energy ball mill. Recently, high pressure torsion (HPT) has been considered as a new MA method and was used for the fabrication of advanced materials with unique properties. In this work, HPT-induced mechanical alloying has been studied in the case of the immiscible Cu-Ta system. Cu and Ta foils with a thickness of 0.025 mm and a diameter of 10 mm were assembled alternatingly and subjected to HPT processing under an applied pressure of 4 GPa for 10, 30, 50, 100 and 150 turns at a rotational speed of 1.5 rpm. The phase constitution and microstructures were examined by X-ray diffraction, transmission and scanning electron microscopy. Additionally, the samples were characterized via microhardness measurements. It was shown that the HPT processing for 150 turns allows to completely mix Cu and Ta.