Analysis of the Microstructure, Properties and Machinability of Al-Cu-Si Alloys

• Autorzy: Kozana J. , Piękoś M. , Maj M. , Garbacz-Klempka A. , Żak P. L.

Identyfikatory

DOI

10.24425/afe.2020.136069

• Języki publikacji: EN

Abstrakty

EN

As part of the studies conducted in the field of broadly understood casting of non-ferrous metals, selected results on the impact of variable additions of copper and silicon in aluminium were presented. A series of melts was carried out with copper content kept constant at a level of 2% (1st stage) and 4% (2nd stage) and variable contents of silicon introduced into aluminium. The crystallization characteristics of the examined alloys and the percentage of structural constituents at ambient temperature were obtained by modelling the thermodynamic parameters of individual phases with the CALPHAD method. The microstructure of the obtained alloys was examined and microhardness was measured by the Vickers-Hanemann method. The alloy properties were assessed based on the results of mechanical tests, including ultimate tensile strength (UTS), hardness (BHN) and elongation (E). The machinability of the tested alloys was analyzed in a machinability test carried out by the Keep-Bauer method, which consisted in drilling with a constant feed force. The obtained results clearly indicate changes in the images of microstructure, such as the reduction in grain size, solution hardening and precipitation hardening. The changes in the microstructure are also reflected in the results of mechanical properties testing, causing an increase in strength and hardness, and plasticity variations in the range of 4 ÷ 16%, mainly due to the introduced additions of copper and silicon. The process of alloy strengthening is also visible in the results of machinability tests. The plotted curves showing the depth of the hole as a function of time and the images of chips produced during the test indicate an improvement in the wear resistance obtained for the tested group of aluminium alloys with the additions of copper and silicon.

Słowa kluczowe

EN

casting of non-ferrous metals; aluminum alloys; ternary Al-Cu-Si alloy; mechanical properties; microstructure; thermo-calc

PL

odlewanie metali nieżelaznych; stopy aluminium; stop trójskładnikowy Al-Cu-Si; właściwości mechaniczne; mikrostruktura

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 4
• Strony: 145--153
• Opis fizyczny: Bibliogr. 43 poz., rys., tab., wykr.

Twórcy

autor

Kozana J.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

autor

Piękoś M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

autor

Maj M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

autor

Garbacz-Klempka A.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

autor

Żak P. L.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Kraków, Poland

Bibliografia

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