Safety Guarantee of Al Alloy Die Castings for the Car Component Made by Plastic Working

2003 ◽  
Vol 2003 (0) ◽  
pp. 87-88
Author(s):  
Hideto SUZUKI ◽  
Tsuyoshi SHIRATORI ◽  
Masashi NAKAMURA ◽  
Masato SATO
Keyword(s):  
Al Alloy ◽  
Plastic Working ◽  
Die Castings ◽  
Car Component

Safety Guarantee of Al Alloy Die Castings for the Car Component Made by Plastic Working

2002 ◽  
Vol 2002 (0) ◽  
pp. 141-142
Author(s):  
Hideto SUZUKI ◽  
Masashi NAKAMURA ◽  
Toshiyuki KANI ◽  
Hisao HUKUNAGA ◽  
Takeshi SAITO
Keyword(s):  
Al Alloy ◽  
Plastic Working ◽  
Die Castings ◽  
Car Component

scholarly journals Experimental and numerical investigations of oxide-related defects in Al alloy gravity die castings

2021 ◽  
Author(s):  
Giulia Scampone ◽  
Raul Pirovano ◽  
Stefano Mascetti ◽  
Giulio Timelli
Keyword(s):  
Fluid Dynamic ◽  
Casting Process ◽  
Numerical Code ◽  
Al Alloy ◽  
Numerical Investigations ◽  
Die Casting Process ◽  
Experimental Findings ◽  
Die Castings ◽  
Filling And Solidification ◽  
Image Analysis Techniques

AbstractThis research aimed to study the formation and distribution of oxide-related defects in the gravity die casting process of an AlSi7Cu0.5Mg alloy by using experimental and numerical investigations. Metallographic and image analysis techniques were conducted to map the distribution of oxide inclusions inside the casting at the microscopic level. Numerical simulations were used to analyse the filling and solidification stages, and to foresee the turbulence of the melt and the formation of the oxide defects. The results show that most of the defects were correlated with the oxide layers or bubbles entrained inside the liquid metal. The accuracy of the numerical code in simulating the metal fluid-dynamic behaviour and the heat transfer was verified, and the results were in agreement with the experimental findings. The numerical distribution of defects was consistent with the experimental results, proving that the model successfully predicted the formation of oxide-related defects.

Effect of the Ceramic Dispersion in the Nickel Matrix Composite Coatings on Corrosion Properties after Plastic Working

2011 ◽  
Vol 183 ◽  
pp. 43-48 ◽  
Author(s):  
Tomasz Cyryl Dyl ◽  
Robert Starosta
Keyword(s):  
Surface Roughness ◽  
Composite Coatings ◽  
Alloy Coating ◽  
Corrosion Current ◽  
Hydraulic Press ◽  
Flame Spraying ◽  
Al Alloy ◽  
Plastic Working ◽  
Corrosion Properties ◽  
Dispersion Phase

Coatings of metal and ceramic composite were applied on the steel specimens using the subsonic process of flame spraying. The specimens were then subjected to both cold and hot plastic working by rolling and also cold pressing by the hydraulic press. Plastic working is an alternative to machining, as the method of finishing of coats applied by flame spraying. The article presents the findings of the research into the possibility of using plastic working (hot and cold rolling and pressing) to obtain the corrosion properties of the flame sprayed Ni-Al alloy coatings and Ni-Al-Al2O3composite coatings. The alloy coatings had a single-phase structure, of the maximum 10% aluminium solubility in the crystal lattice of nickel, whereas in the composite coatings the volume content of non-metallic material Al2O3was 15% and 30 %. After finishing the adhesion reduction, cracks on the surface and cross-sections of coatings was not observed. The largest value of strain hardening of alloy coating Ni-5%Al was stated after pressing. The composite coatings obtain by flame spraying be characterized by big surface roughness (Ra= 13.3 µm). The plastic working caused decrease surface roughness. Minimum value of Raparameter was observed after hot rolling. It was found that maximal roughness was presented after pressing. The corrosion tests were performed in 0.01 M H2SO4solution by potentiokinetic technique. The article presents the effect of dispersion phase of Al2O3on corrosion properties of composite coatings on the nickel base. The corrosion rate was dependent on method of plastic working. The increasing drafts resulted in rise corrosion current density and decrease in value of corrosion potential.

scholarly journals Evaluation of Porosity in Al Alloy Die Castings

2012 ◽  
Vol 12 (1) ◽  
pp. 93-98
Author(s):  
M. Říhová ◽  
J. Cech ◽  
J. Havlíčková
Keyword(s):  
Mechanical Properties ◽  
Squeeze Casting ◽  
Die Casting ◽  
Longitudinal Section ◽  
Al Alloy ◽  
Technological Properties ◽  
Complex Evaluation ◽  
Die Cast ◽  
Alloy Castings ◽  
Die Castings

Evaluation of Porosity in Al Alloy Die Castings Mechanical properties of an Al-alloy die casting depend significantly on its structural properties. Porosity in Al-alloy castings is one of the most frequent causes of waste castings. Gas pores are responsible for impaired mechanical-technological properties of cast materials. On the basis of a complex evaluation of experiments conducted on AlSi9Cu3 alloy samples taken from the upper engine block which was die-cast with and without local squeeze casting it can be said that castings manufactured without squeeze casting exhibit maximum porosity in the longitudinal section. The area without local squeeze casting exhibits a certain reduction in mechanical properties and porosity increased to as much as 5%. However, this still meets the norms set by SKODA AUTO a.s.

scholarly journals Formation of Die Soldering and the Influence of Alloying Elements on the Intermetallic Interface

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1580
Author(s):  
Marius Kohlhepp ◽  
Peter J. Uggowitzer ◽  
Marc Hummel ◽  
Heinz Werner Höppel
Keyword(s):  
Pure Aluminum ◽  
Intermetallic Phase ◽  
Al Alloy ◽  
Aluminum Casting ◽  
Β Phase ◽  
Alsi Alloy ◽  
Casting Industry ◽  
Die Castings ◽  
3Si2 Phase ◽  
Intermetallic Layers

Die soldering of die castings is a serious problem in the aluminum casting industry. The precise mechanism, the influence of the alloy composition, and the options for prevention have not yet been fully elaborated. A well-established solution for alloys with low iron content is the addition of manganese. However, up to 0.8 wt.% is necessary, which increases the amount of brittle phases in the material and consequently reduces ductility. Immersion tests with 1.2343 tool steel and pure aluminum as well as a hypoeutectic AlSi-alloy with Mn, Mo, Co, and Cr additions were carried out to systematically investigate the formation of die soldering. Three different intermetallic layers and a scattered granular intermetallic phase formed at the interface between steel and Al-alloy after immersion into the melt for a duration of 6 min at 710 °C. The combined presence of the irregular, needle-shaped β-Al5FeSi phase and the surrounding alloy was responsible for the bond between the two components. Mn and Mo inhibited the formation of the β-phase, and instead promoted the αC-Al15(Fe,X)3Si2 phase. This led to an evenly running boundary to the AlSi-alloy and thus prevented bonding. Cr has proven to be the most efficient addition against die soldering, with 0.2 wt.% being sufficient. Contrary to the other elements investigated, Cr also reduced the thickness of the intermetallic interface.

Formation of the surface layer in hypoeutectic Al-alloy high-pressure die castings

2011 ◽  
Vol 130 (1-2) ◽  
pp. 251-258 ◽  
Author(s):  
S. Otarawanna ◽  
C.M. Gourlay ◽  
H.I. Laukli ◽  
A.K. Dahle
Keyword(s):  
High Pressure ◽  
Surface Layer ◽  
Al Alloy ◽  
Die Castings

The Effect of the Ceramic Dispersion on the Nickel Matrix Composite Coating Properties after Plastic Working

2009 ◽  
Vol 147-149 ◽  
pp. 813-818 ◽  
Author(s):  
Tomasz Cyryl Dyl ◽  
Robert Skoblik ◽  
Robert Starosta
Keyword(s):  
Composite Coatings ◽  
Hydraulic Press ◽  
Flame Spraying ◽  
Al Alloy ◽  
Plastic Working ◽  
Dispersion Phase ◽  
Metallic Material ◽  
Al2o3 Composite ◽  
Nickel Base ◽  
Hot And Cold Rolling

The paper presents the effect of dispersion phase of Al2O3 on selected potential properties of composite coatings on the nickel base. Coatings of Ni-Al-Al2O3 were applied on the steel specimens using the subsonic process of flame spraying. The specimens were then subjected to both cold and hot plastic working by rolling and also cold pressing by the hydraulic press. Plastic working is an alternative to machining, as the method of finishing of coats applied by flame spraying. The paper presents the findings of the research into the possibility of using plastic working (hot and cold rolling and pressing) to obtain the selected properties of the flame sprayed Ni-Al alloy coatings and Ni-Al-Al2O3 composite coatings. The alloy coatings had a single-phase structure, namely boundary solution α , of the maximum 10% aluminium solubility in the crystal lattice of nickel, whereas in the composite coatings the volume content of non-metallic material Al2O3 was: 0, 15, and 30 %.

Effets of surfaces on precipitate morphology in irradiated thin foils

1978 ◽  
Vol 36 (1) ◽  
pp. 654-655
Author(s):  
D.I. Potter ◽  
A. Taylor
Keyword(s):  
Ion Irradiation ◽  
Dark Field Image ◽  
Thin Foil ◽  
Dark Field ◽  
Al Alloy ◽  
Bright Field Image ◽  
Dislocation Loops ◽  
Precipitate Morphology ◽  
Thin Foils

Thermal aging of Ni-12.8 at. % A1 and Ni-12.7 at. % Si produces spatially homogeneous dispersions of cuboidal γ'-Ni3Al or Ni3Si precipitate particles arrayed in the Ni solid solution. We have used 3.5-MeV 58Ni+ ion irradiation to examine the effect of irradiation during precipitation on precipitate morphology and distribution. The nearness of free surfaces produced unusual morphologies in foils thinned prior to irradiation. These thin-foil effects will be important during in-situ investigations of precipitation in the HVEM. The thin foil results can be interpreted in terms of observations from bulk irradiations which are described first.Figure 1a is a dark field image of the γ' precipitate 5000 Å beneath the surface(∿1200 Å short of peak damage) of the Ni-Al alloy irradiated in bulk form. The inhomogeneous spatial distribution of γ' results from the presence of voids and dislocation loops which can be seen in the bright field image of the same area, Fig. 1b.

A microscopic marker experiment study on high temperature oxidation of Ni-Al alloy

1986 ◽  
Vol 44 ◽  
pp. 514-515
Author(s):  
Shou-kong Fan
Keyword(s):  
Transport Mechanism ◽  
High Temperature Oxidation ◽  
Transverse Section ◽  
Al Alloy ◽  
Metal Interface ◽  
Electron Microscopic ◽  
Temperature Oxidation ◽  
Analytical Electron ◽  
Microscopic Studies ◽  
First Time

Transmission and analytical electron microscopic studies of scale microstructures and microscopic marker experiments have been carried out in order to determine the transport mechanism in the oxidation of Ni-Al alloy. According to the classical theory, the oxidation of nickel takes place by transport of Ni cations across the scale forming new oxide at the scale/gas interface. Any markers deposited on the Ni surface are expected to remain at the scale/metal interface after oxidation. This investigation using TEM transverse section techniques and deposited microscopic markers shows a different result,which indicates that a considerable amount of oxygen was transported inward. This is the first time that such fine-scale markers have been coupled with high resolution characterization instruments such as TEM/STEM to provide detailed information about evolution of oxide scale microstructure.

Diffraction study on bainite of Cu-Al alloy

1990 ◽  
Vol 48 (4) ◽  
pp. 1006-1007
Author(s):  
Delu Liu ◽  
T. Ko
Keyword(s):  
Diffraction Study ◽  
Parent Phase ◽  
Al Alloy ◽  
Alloy Sample ◽  
Bright Field Image ◽  
Hexagonal System ◽  
Iced Brine ◽  
Diffraction Patterns ◽  
Zone Pattern ◽  
Stacking Structure

Structure of bainite in Cu-Al and Cu-Zn-Al alloys has been reported as 3R, 9R or 18R long period stacking structure (LPS) by X-ray and electron diffraction studies. In the present work, a Cu-25.5 (at)% Al alloy sample was heated at 900°C for 2 h then isothermally held at 450°C for 60 s before quenching into iced brine. FIG.1 shows a TEM bright field image of bainite plates (marked B) grown from grain boundary. The parent phase ( with DO3 structure ) has transformed to martensite (marked M ) during cooling from 450° C to 0°C. Both bainite and martensite plates have dense striations inside.Careful diffraction study on a JEOL 2000FX TEM with accelerating voltage 200 KV revealed (FIG.2) that the diffraction patterns contai_ning the same zone axis [001] ( hexagonal index ) or [111]c ( cubic index ) are from a bainite plate with obtuse V-shape. They are indexed as [010], [140], [130], [120], [230], [340] and [110] zone pattern for hexagonal system respectively.

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