Institute of Non Ferrous

Skawina, Poland

Institute of Non Ferrous

Skawina, Poland
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Szymanski W.,Institute of Non Ferrous | Bigaj M.,Institute of Non Ferrous | Gawlik M.,Institute of Non Ferrous | Mitka M.,Institute of Non Ferrous | Szymanek M.,Institute of Non Ferrous
Archives of Metallurgy and Materials | Year: 2014

One of the methods to produce aluminium alloys of an uncommon composition and structure is by the combined process of casting with rapid solidification and the following plastic forming. When modern advanced methods of rapid cooling of the melt are used, the alloy structure solidifies as a powder in the atomiser or as ribbons when cast onto a rapidly rotating copper wheel. If optimum conditions for the process of casting and rapid consolidation are satisfied, it is possible to control some structure parameters like the size of the particles, the size of the precipitates, etc. Additionally, the production of aluminium alloys by rapid solidification allows introducing the alloying constituents that are incompatible with the state of equilibrium. The consolidation of material made by rapid solidification is achieved in one of the numerous variations of the plastic forming processes, among which the most commonly used are the direct extrusion and continuous rotary extrusion (CRE). This paper presents the results of the consolidation in the process of continuous rotary extrusion (CRE) of selected aluminum alloys with an unusually high content of alloying elements cast in the process of rapid solidification by melt spinning and crushed in a high-speed cutting mill to as "chips".


Boczkal S.,Institute of Non Ferrous | Lech-Grega M.,Institute of Non Ferrous | Plonka B.,Institute of Non Ferrous
Archives of Metallurgy and Materials | Year: 2014

The structure and properties of AZ61 alloy after deformation by ECAE were characterised. Alloy structure was examined after the successive passes of ECAE process, to study the effect of deformation on the morphology of γ phase precipitates and the size and shape of grains. Based on EBSD analysis, the occurrence of high angle boundaries was stated. An attempt was made to describe the mechanisms that are operating when the deformation route is changed at 300°C in the AZ61 alloy processed by ECAE method. Alloy hardness after the first cycle of deformation was stabilised at the level of 80-90 HB. Based on the hardening curve and the occurrence of high angle grain boundaries (>15°), the possibility of further deformation of the AZ61 alloy was confirmed.


Lech-Grega M.,Institute of Non Ferrous | Szymanski W.,Institute of Non Ferrous | Boczkal S.,Institute of Non Ferrous | Gawlik M.,Institute of Non Ferrous | Bigaj M.,Institute of Non Ferrous
TMS Light Metals | Year: 2015

The paper presents the results of the mechanical properties of AlMgSiCu aluminum alloys with vanadium in an amount of 0.1 and 0.2 wt.%. During solutioning heat treatment and aging which were compared with those for the material without the addition of copper. The reference material was 6xxx alloy without copper and vanadium. Analysis of the structure of the transmission electron microscope (TEM with EDS) revealed the role of vanadium in the heat treatment process. During the aging, in addition to precipitation of the phases Al2Cu and Mg2Si, the finely vanadium and vanadium-iron phases was observed. The size and distribution vanadium phases were also dependent on the chemical composition of the alloy. It was found that in AlMgSuCu alloys with vanadium clearly relies Rm and Rp0, 2, the additive vanadium in an amount of 0.2 wt.%. increases elongation almost doubled. The optimum heat treatment parameters was determined for states T6, T61, T64 and T7. The information on the role of vanadium in the process of strengthening of precipitation are sporadic [3-6]. It is only known that vanadium acts as a grain refiner and also lowers the conductivity and raises the temperature of recrystallization [4, 5]. Investigation of the effect of vanadium in an amount of 0.1% in the alloy 6063 [6] found that the kinetics of vanadium accelerates precipitation of phase β′ and β″, which in turn will have an impact on strength and yield strength of the material after aging.

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