Rheological Analysis of Semi-Solid A380.0 Aluminium Alloy / Analiza Właściwości Reologicznych Stopu Aluminium A380.0 W Stanie Stało-Ciekłym

Abstract

RheologIcal analysIs of semI-solId a380.0 alumInIum alloy AnAlizA włAściwości reologicznych stopu Aluminium A380.0 w stAnie stAło-ciekłym Knowledge of the rheological properties is crucial for the numerical modeling of technological processes. The main objective of this study was to conduct an analysis of the rheological properties of A380.0 (AlSi9Cu3(Fe)) aluminium alloy in the semi-solid state. The results could be used for identification of temperature range of the alloy, where thixoforming processes could be executed. Another purpose of the experimental work could be development of the mathematical models of the alloy apparent viscosity. The significant achievement of this particular study is an application of a viscometer which was specially designed for material tests executed at high temperatures, such as the measurement of liquid or semi-liquid aluminium viscosity. This paper presents the results of a rheological analysis of aluminium alloy.

Numerical simulations of thixotropic semi-solid aluminium alloys in open-rotor and rotor–stator mixers

“…This constitutive model captures the main features of semi-solid aluminium alloys, i.e. strong shear-thinning accompanied by thixotropy and non-linear viscoelasticity [15]. As an illustrative example, in Fig.…”

“…• C are plotted from [15]. This information helps to identify the common and defining features of molten Al-alloys, i.e.…”

“…Despite the apparent simplicity related to the choice of a Newtonian description, such an assumption cannot generally hold for aluminium alloys. In fact, below a critical temperature (≈ 590 • C for A380 [15]), alloys undergo liquid-solid transition and start showing significant temperature effects (i.e. on viscosity η(T )), as well as highly non-Newtonian properties.…”

Archives of Metallurgy and Materials

“…For hard materials, the post solidification working is quite difficult. To achieve high hardness, it was recommended to apply pressure during the semisolid state [22][23]. To achieve the fastest cooling rate, it is desirable to obtain peak heat flux between the casting and mold surface.…”

Rheology of StelliteTM 21 Alloy in Semi-Solid State

“…Especially, the results obtained by Modigell [13], who analysed flow properties of X210CrW12 up to 1500 °C using rotational viscometer should be taken into consideration. Similar approach was used by Solek [14] where aluminium alloys were investigated. Another approach based on compression test was applied by Cezard [15] and Solek [16].…”