Simulation of Real Image Microstructural Model of Semi-solid Aluminium Alloy Using a Coupled Eulerian–Lagrangian Approach

Electromagnetic stirring (EMS) has become one of the most important branches of the electromagnetic processing of materials. However, a deep understanding of the influence of the EMS on the thermo-fluid flow of the aluminium alloy melt, and consequently the refinement of the microstructure is still not available. This paper investigated the influence of the operating parameters of EMS on the magnetohydrodynamics, temperature field, flow field, and the vortex-shaped structure of the melt as well as the microstructure of the aluminium alloy 2A50 billet by numerical simulation and experiments. The operating parameters were categorised into three groups representing high, medium, and low levels of Lorentz forces generated by EMS. The numerical simulation matched well with the experimental result. It was found that a high level of EMS can improve the uniformity of the temperature and flow fields. The maximum speed was observed at the radius of around 25 mm under all EMS levels. Both the depth and diameter of the vortex-shaped structure generated increased with the enhancement in the EMS level. The average grain size of the edge sample of the billet was reduced by 48.3% while the average shape factor was increased by 51.0% under the medium-level EMS.

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Age hardening behaviour of semi‐solid squeeze cast A319 aluminium alloy

Materialwissenschaft und Werkstofftechnik ◽

10.1002/mawe.201800037 ◽

2018 ◽

Vol 49 (12) ◽

pp. 1503-1509 ◽

Cited By ~ 1

Author(s):

Q.F. Wang ◽

L.D. Wang ◽

D.Y. Zhu ◽

Z. Lin ◽

X. Chen ◽

...

Keyword(s):

Aluminium Alloy ◽

Age Hardening ◽

Squeeze Cast ◽

Semi Solid

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Microstructure and Hardness of Friction Welded SSM 356 Aluminium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.887-888.1273 ◽

2014 ◽

Vol 887-888 ◽

pp. 1273-1279 ◽

Cited By ~ 1

Author(s):

Kulyuth Boonseng ◽

Chaiyoot Meengam ◽

Suppachai Chainarong ◽

Prapas Muangjunburee

Keyword(s):

Aluminum Alloys ◽

Aluminium Alloy ◽

Friction Welding ◽

Rotational Speed ◽

Base Material ◽

Original Structure ◽

Welding Time ◽

Globular Structure ◽

Average Hardness ◽

Semi Solid

SSM 356 aluminum alloys was obtained from a rheocasting technique named gas induced semi solid process has globular structure on base. The friction welding method conserve microstructure that is similar to the original structure of the base material a globular structure. It is also found that a rotational speed of 1750 RPM, burn of Length of 3.2 millimeters and welding time (upset time) of 30 second can produce a very good weld. The results of the investigation have shown that a have average hardness in the range 58.13 HV.

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

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0078 ◽

2016 ◽

Vol 61 (1) ◽

pp. 433-438 ◽

Cited By ~ 2

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.

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Laser Welding of SSM Cast A356 Aluminium Alloy Processed with CSIR-Rheo Technology

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.173 ◽

2006 ◽

Vol 116-117 ◽

pp. 173-176 ◽

Cited By ~ 3

Author(s):

R. Akhter ◽

L. Ivanchev ◽

C. Van Rooyen ◽

P. Kazadi ◽

H.P. Burger

Keyword(s):

Mechanical Properties ◽

Laser Welding ◽

Weld Metal ◽

Aluminium Alloy ◽

Nd:Yag Laser ◽

Dendrite Structure ◽

Weld Microstructure ◽

Semi Solid ◽

A356 Aluminium Alloy ◽

Fine Dendrite

Samples of aluminium alloy A356 were manufactured by Semi Solid Metals HPDC technology, developed recently in CSIR-Pretoria. They were butt welded in as cast conditions using an Nd:YAG laser. The base metal and weld microstructure were presented. The effect of different heat treatments on microstructure and mechanical properties of the welds were investigated. It was found that the fine dendrite structure of the weld metal contributed for equalizing the mechanical properties of the joint.

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Fracture Property Correlation of Rheocast (EMS) and Thixocast 6061 Aluminium Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.217-218.405 ◽

2014 ◽

Vol 217-218 ◽

pp. 405-411 ◽

Cited By ~ 1

Author(s):

Shailesh K. Singh ◽

Prosenjit Das ◽

Kamanio Chattopadhyay ◽

P. Dutta

Keyword(s):

Mechanical Properties ◽

Aluminium Alloy ◽

Fracture Property ◽

Casting Machine ◽

Tensile Tests ◽

Uniaxial Tensile ◽

Cast State ◽

Property Correlation ◽

Semi Solid ◽

6061 Aluminium Alloy

The present study has been taken up to establish fracture property correlation of the semi solid processed 6061 aluminium alloy. Electro Magnetic Stirring (EMS) has been performed to get non-dendritic billets and then the alloy has been thixocast using a High pressure die casting machine. Tensile tests have been performed to estimate mechanical properties of the semi solid processed alloy. Fracture behaviour of the alloy has been investigated at the intermediate EMS cast state and subsequent final thixocast state, employing uniaxial tensile tests at 0.001s-1strain rate and at room temperature. Fracture surface morphology of the EMS cast state shows that the presence of micro porosity is responsible for crack initiation and final fracture. Our results confirm that the dimpled rupture of primary Al phase is responsible for improved mechanical properties in the thixocast state of the alloy.

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The T5 Heat Treatment of Semi-Solid Metal Processed Aluminium Alloy F357

Materials Science Forum ◽

10.4028/www.scientific.net/msf.618-619.365 ◽

2009 ◽

Vol 618-619 ◽

pp. 365-368 ◽

Cited By ~ 7

Author(s):

Heinrich Möller ◽

Gonasagren Govender ◽

Waldo Stumpf

Keyword(s):

Heat Treatment ◽

Aluminium Alloy ◽

Tensile Properties ◽

Cooling Rate ◽

Quality Index ◽

Artificial Aging ◽

Natural Aging ◽

Solid Metal ◽

Semi Solid

The T5 heat treatment of semi-solid metal (SSM) processed alloy F357 was investigated by considering the effects of cooling rate and natural aging after casting, as well as artificial aging parameters on tensile properties. In addition, the tensile properties of SSM-HPDC F357 in different temper conditions (F, T4, T5 and T6) are compared. The Quality Index (QI) is used to compare the influence of different T5 heat treatment parameters and different temper conditions.

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