Mechanical dissolution of copper additions in aluminium by Friction Stir Processing

21st Chemnitz Seminar on Materials Engineering – 21. Werkstofftechnisches Kolloquium

Gnedel, M.^1 ; Zens, A.^2 ; Haider, F.^1 ; Zaeh, M.F.^2

University of Augsburg, Universitätsstraße 2, Augsburg

86159, Germany^1

Institute for Machine Tools and Industrial Management, Technical University of Munich, Boltzmannstraße 15, Garching

85748, Germany^2

关键词: Diffusion length;    Energy dispersive X ray spectroscopy;    Friction stir processing;    Hardening effects;    Intermetallic phasis;    Microstructural stability;    Processing parameters;    Solid solution hardening;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/480/1/012020/pdf
DOI  :  10.1088/1757-899X/480/1/012020

来源: IOP

【 摘 要 】

Friction Stir Processing (FSP) can be used to locally modify properties in materials such as aluminium. Furthermore, the composition of the alloy can be changed by this technique. Intermixing specific micrometer-sized metal powders as well as metal foils helps to optimize both the microstructural stability during subsequent heat treatment, as well as the mechanical properties in general. Dispersing copper powder inside a matrix of AA1050 aluminium by FSP can produce homogenous solid solution of the two elements, if suitable processing parameters are used. A substantial hardening effect is shown for both effects, refinement of the grain structure and solid solution hardening. By calculating the diffusion length and using the results of investigations based on energy-dispersive X-ray spectroscopy (EDS), it can be shown that the dissolution is mainly mechanically driven and not due to diffusion. Furthermore, transmission electron microscopy (TEM) provides insights on the formation of intermetallic phases during FSP. The results may be used in future studies to evaluate the properties of such non-equilibrium alloys.