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

2015 ◽  
Vol 60 (4) ◽  
pp. 2613-2618 ◽  
Author(s):  
K. Solek ◽  
S. Szczepanik
Keyword(s):  
Numerical Modeling ◽  
Solid State ◽  
Aluminium Alloy ◽  
Rheological Properties ◽  
Experimental Work ◽  
Liquid Aluminium ◽  
Rheological Analysis ◽  
Significant Achievement ◽  
Semi Solid ◽  
Material Tests

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.

scholarly journals Properties of „In Situ” 7475 Alloy Matrix Composites Reinforced Al3Ti Intermetalic Compound Extruded in Semi-Solid State

2016 ◽  
Vol 61 (1) ◽  
pp. 433-438 ◽  
Author(s):  
W. Szymański
Keyword(s):  
Heat Treatment ◽  
Solid State ◽  
Aluminium Alloy ◽  
Extrusion Process ◽  
Liquid Aluminium ◽  
Alloy Matrix ◽  
Electron Microscopies ◽  
Semi Solid ◽  
Composite Hardness

Studies were conducted to improve the mechanical properties of composites based on 7475 aluminium alloy reinforced with Al3Ti particles fabricated by the “in situ” process. The first step involved “dissolving” of titanium in the liquid aluminium alloy and fabricating in this way composite materials with different content of the reinforcing phase (15-45wt%). A relationship between the composite hardness and content of the reinforcing phase was confirmed. The second step involved the improvement of cohesion between the reinforcing particles and composite matrix. By extrusion of samples in semi-solid state, an average increase in hardness by 15-20% relative to the unextruded composite was obtained. In the third step, the fabricated composite was subjected to a heat treatment corresponding to the state T6 in 7475 alloy, which raised the hardness by about 30%. Structure examinations carried out by means of optical microscopy and scanning electron microscopies as well as the results of hardness measurements were described. They enabled estimating the effect of the content of produced Al3Ti particles, and of the extrusion process in semi-solid state and heat treatment parameters on the composite properties. In compression test, the yield strength and compressive strength of the heat-treated composites were determined.

scholarly journals Rheology of StelliteTM 21 Alloy in Semi-Solid State

2016 ◽  
Vol 61 (4) ◽  
pp. 1901-1908 ◽  
Author(s):  
K. Sołek ◽  
P. Kapranos
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Experimental Work ◽  
High Hardness ◽  
Measurement Methods ◽  
Viscosity Models ◽  
High Temperature Furnace ◽  
Secondary Objective ◽  
Semi Solid ◽  
Temperature Furnace

Abstract The main objective of this study was to conduct an analysis of the rheological properties of StelliteTM 21 alloy in the semi-solid state, as the results could be used for identifying the appropriate temperature range for thixoforming of this alloy, and a secondary objective of the experimental work was the development of mathematical model of the alloy’s apparent viscosity. Such viscosity models are necessary for numerical simulations of the thixoforming processes. The StelliteTM 21 alloy exhibits high hardness and thus shaping in the semi-solid state is promising route of production of parts from this alloy. Within the confines of experimental work the measurement methods of the rheological properties at high temperatures was developed. They are based on the use of specially designed viscometer equipped with high temperature furnace.

Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route

2012 ◽  
Vol 192-193 ◽  
pp. 323-328 ◽  
Author(s):  
Mehand Tebib ◽  
Frank Ajersch ◽  
X. Grant Chen
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Parallel Plate ◽  
Fluid Model ◽  
Flow Behavior ◽  
Microstructural Study ◽  
Shear Rates ◽  
Solid Phases ◽  
Semi Solid ◽  
Liquid And Solid Phases

The SEED rheocasting process was used to produce semi-solid slurries of hypereutectic Al-17Si-4.5Cu (A390) and Al-15Si-10.5Mg-4Cu alloys respectively. The rheological properties of these alloys in the semi-solid state were characterized at different deformation rates and at variable solid fractions using the parallel plate compression viscometry. The viscosity at different shear rates was calculated using a Newtonian fluid model for increments of deformation during compression. Microstructures of both alloys, after partial solidification and compression, were examined in order to characterize the flow behavior during deformation. The comparison of the viscosity between the A390 and Al-15Si-10.5Mg-4Cu alloys indicated that the high Mg containing alloy possessed a higher viscosity for the range of shear rates and solid fractions investigated. Rheological results showed that at a given solid fraction, the viscosity of both alloys decreased significantly with increasing shear rates, indicating a shear thinning behavior. In addition, a separation of liquid and solid phases was also observed for both alloys in the microstructural study of compressed semi-solid billets.

scholarly journals Recrystallisation in the semi-solid state in 7075 aluminium alloy

2008 ◽  
Vol 490 (1-2) ◽  
pp. 266-276 ◽  
Author(s):  
H.V. Atkinson ◽  
K. Burke ◽  
G. Vaneetveld
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Semi Solid

Enhancement of Gleditsia sinensis gum rheological properties with pressure cell treatment in semi-solid state

2016 ◽  
Vol 84 ◽  
pp. 254-260
Author(s):  
Zi-yuan Zhou ◽  
Wei-an Zhang ◽  
Jiu-fang Duan ◽  
Wei-ming Zhang ◽  
Da-feng Sun ◽  
...  
Keyword(s):  
Solid State ◽  
Rheological Properties ◽  
Pressure Cell ◽  
Gleditsia Sinensis ◽  
Semi Solid

scholarly journals Influence of Parameters during Induction Heating Cycle of 7075 Aluminium Alloys with RAP Process

2008 ◽  
Vol 141-143 ◽  
pp. 719-724 ◽  
Author(s):  
G. Vaneetveld ◽  
Ahmed Rassili ◽  
H.V. Atkinson
Keyword(s):  
Solid State ◽  
Aluminium Alloy ◽  
Heating Rate ◽  
Induction Heating ◽  
Aluminium Alloys ◽  
Heating Cycle ◽  
Fast Heating ◽  
Globular Microstructure ◽  
Protective Gas ◽  
Semi Solid

Thixoforging involves shaping alloys with a globular microstructure in the semi-solid state. To reach this kind of material, the Recrystallisation and Partial Melting (RAP) process can be used to obtain a globular microstructure from extruded material with liquid penetrating the recrystallised boundaries. Induction heating is used to apply the RAP process to slugs. One of the benefits of using this method of heating is the fast heating rate (20°C/s). This paper will help to improve heating parameters by showing their influence on 7075 aluminium alloy recrystallisation. These parameters are the heating rate; heating frequencies-power; presence or not of protective gas; position of the slug in the inductor; energy stored inside the slug; oxide layer on the slug side; chamfer of the slug upper corner.

Analysis of Rheological Properties of Steel near Solidus Point Using Gleeble® Simulator

2008 ◽  
Vol 141-143 ◽  
pp. 325-330
Author(s):  
Krzysztof P. Sołek ◽  
Zbigniew Mitura ◽  
Mirosław Karbowniczek ◽  
Plato Kapranos ◽  
Roman Kuziak ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Solid State ◽  
Liquid Phase ◽  
Rheological Properties ◽  
Wide Temperature Range ◽  
Steel Alloy ◽  
Phase Content ◽  
Globular Microstructure ◽  
Die Filling ◽  
Semi Solid

The main goal of this work is the analysis of rheological properties of steel alloy at high temperatures, just below the solidus point, and in the semi-solid state with low liquid phase content. Data obtained from the analysis can form the basis of numerical simulation for designing and optimizing the thixoforming processes. The rheological properties should be known over a wide temperature range so that the simulations could also predict defects such as incomplete die filling. The analysis concerned M2 tool steel alloy. The paper also discusses development of globular microstructure in partially melted steel.

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