Porosity Quatification of Cast Aluminium Alloys on Machined Surfaces Using Metallography and Eddy-Currents

2015 ◽  
Vol 647 ◽  
pp. 188-194
Author(s):  
Břetislav Skrbek
Keyword(s):  
Surface Treatment ◽  
Aluminium Alloys ◽  
Eddy Currents ◽  
Initiation Site ◽  
Cast Aluminium ◽  
Strength And Ductility ◽  
Machined Surfaces

The porosity is unwanted phenomenon mostly that is tried to eliminate. The pores are initiation site of fatigue fractions usually, they worse strength and ductility of materials, quality of machined surfaces and their following surface treatment.

Effect of Stirring on the Quality of ADC 12 Cast Aluminium Alloy

2020 ◽  
Vol 867 ◽  
pp. 98-102
Author(s):  
H.C. Kis Agustin ◽  
Indra Sidharta ◽  
Leonard
Keyword(s):  
Liquid Metal ◽  
Aluminium Alloys ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Bulk Liquid ◽  
Reduced Pressure ◽  
Cast Aluminium ◽  
Stirring Time

Stirring is one the most utilized process in small foundry. It is used for homogenizing the temperature and mixing process during melting. However, stirring may cause undesirable effect to the quality of castings if it is not managed properly. Bifilm is one of the defects that can be detrimental to the quality of aluminium castings, and its formation can be related to the stirring during melting. The research aim is to investigate the effect of stirring during melting of cast aluminium alloys. The quality of castings is approached by the term of bifilm index and mechanical properties. ADC 12 cast aluminium alloys is used in the experiment. The ADC 12 ingots are melted at 720 °C, and then stirred for 0, 3 and 5 minutes. Reduced Pressure Test is used for determining the bifilm index. Samples for mechanical testing are also casted into specific geometry. Results indicate that prolonged stirring time increases the bifilm index, indicating that more porosity and bifilm oxide are formed. Extended stirring time instigates more turbulence in liquid metal, hence surface oxides are folded and trapped in the bulk liquid metal. Charpy impact test, hardness test and tensile test have also carried out. More Porosity and bifilm oxide are formed in the samples and tend to decrease the mechanical property.

PVD surface treatment of heat-treated cast aluminium alloys

2016 ◽  
Vol 79 (2) ◽  
pp. 79-88 ◽  
Author(s):  
T. Tański ◽  
L.A. Dobrzański ◽  
M. Wiśniowski ◽  
T. Linek ◽  
R. Szklarek
Keyword(s):  
Surface Treatment ◽  
Aluminium Alloys ◽  
Cast Aluminium ◽  
Heat Treated

Colour Metallography of Cast Aluminium Alloys

2014 ◽  
Vol 51 (7) ◽  
pp. 514-529 ◽  
Author(s):  
Laura García ◽  
Christian Dietz ◽  
Antonio J. Criado ◽  
J.A. Martínez
Keyword(s):  
Aluminium Alloys ◽  
Cast Aluminium

Die optischen Konstanten von Phasen in Aluminium- Gußlegierungen / The Optical Constants of Phases in Cast Aluminium Alloys

1983 ◽  
Vol 20 (3) ◽  
pp. 105-117
Author(s):  
Irfan Aydin ◽  
Hans-Eugen Bühler ◽  
Gerhard Elssner ◽  
Isolde Stapf
Keyword(s):  
Aluminium Alloys ◽  
Optical Constants ◽  
Cast Aluminium

Quality Assessment of Machined Surfaces by an Optical Profilometer

2015 ◽  
Vol 669 ◽  
pp. 443-450
Author(s):  
Jana Gerková ◽  
Ľuboslav Straka
Keyword(s):  
Quality Assessment ◽  
Surface Quality ◽  
Production System ◽  
Head Movement ◽  
Movement Speed ◽  
Technological Parameters ◽  
Cutting Head ◽  
Optical Profilometer ◽  
Machined Surfaces

Technological parameters affecting the surface quality of cutting edges in production system with the AWJ technology include cutting head movement speed. The article examines and evaluates the quality of processed surface by the AWJ technology on selected materials as related to the change of cutting head movement speed. It was discovered that the movement speed for the AWJ technology has a significant effect on the surface quality

Grain Refinement and Hot Tearing of Aluminium Alloys - How to Optimise and Minimise

2009 ◽  
Vol 630 ◽  
pp. 213-221 ◽  
Author(s):  
Mark Easton ◽  
David H. StJohn ◽  
Lisa Sweet
Keyword(s):  
Grain Refinement ◽  
Aluminium Alloys ◽  
Hot Tearing ◽  
Key Factors ◽  
Grain Refiner ◽  
Factors Affecting ◽  
Equiaxed Grains

Grain refinement and hot tearing are important key factors affecting the quality of castings. There have been substantial advances in the understanding of both of these phenomena over the last two decades. The paper discusses strategies for obtaining the lowest cost grain refiner addition and provides an explanation for how the refinement of equiaxed grains leads to a reduction in hot tear susceptibility. However, it also provides a warning that adding more grain refiner may not be better for reducing hot tear susceptibility. Alloy factors affecting hot tearing are also discussed. Finally, a list of six key considerations is provided to help casthouse and foundry engineers when trying to optimise grain refinement and reduce hot tearing.

scholarly journals Comparative effects of corrosion on electroless -nickel plated A6061 alloys in DOT3 brake fluid

2018 ◽  
Vol 7 (2) ◽  
pp. 927
Author(s):  
Olawale O. Ajibola ◽  
Peter A.Olubambi
Keyword(s):  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Electroless Nickel ◽  
Master Cylinder ◽  
Brake Fluid ◽  
Hardness Tester ◽  
Corrosion Rates ◽  
Hydraulic Brake ◽  
Cast Aluminium ◽  
Cylinder Piston

Aluminium alloys used in automobile brake master cylinder pistons wear by corrosion due to contamination and chemical reaction of the contacting brake fluid. The study investigates the corrosion of electroless-nickel (EN) deposition enhanced cast aluminium alloy master cylinder piston surfaces immersed in hydraulic brake oil. Cast specimens were produced from the as-received wrought A6061 alloy scrap by sand casting. EN plated as-received and cast aluminium alloys specimens were immersed fully in brake oil for 1680 hours and corrosion rates were determined every 24 hours. Test samples were characterised using the hardness tester, atomic absorption spectrometer, metallurgical photo-microscope, x-ray diffractometer; and SEM with EDX attachment. Both surfaces corroded in the order of electroless-nickel plated cast aluminium alloy (ENCA) < electroless-nickel plated as-received aluminium alloy (ENAA) at 0.0235 and 0.0251 rates (mg/mm2/y) results which showed improvement in the corrosion resistance with significant influence of electroless-nickel coating in reducing corrosion rates of aluminium alloy in brake oil.  

Friction Stir Welding of Elements Made of Cast Aluminium Alloys

2014 ◽  
Vol 59 (1) ◽  
pp. 385-392
Author(s):  
B. Rams ◽  
A. Pietras ◽  
K. Mroczka
Keyword(s):  
Friction Stir Welding ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Welding Parameters ◽  
Process Conditions ◽  
Friction Stir ◽  
Seam Weld ◽  
Cast Aluminium ◽  
Weld Structure ◽  
Welding Stability

Abstract The article presents application of FSW method for joining elements made of cast aluminium alloys which are hardly weldable with other known welding techniques. Research’s results of plasticizing process of aluminium and moulding of seam weld during different FSW process’ conditions were also presented. Influence of welding parameters, shape and dimensions of tool on weld structure, welding stability and quality was examined. Application of FSW method was exemplified on welding of hemispheres for valves made of cast aluminium alloy EN AC-43200.

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