The Effect of SR-Modification Treatment on Porosity Formation of Reduced Pressure 319 Al Alloy Castings

2003 ◽  
Vol 42 (2) ◽  
pp. 245-251 ◽  
Author(s):  
S.M. Miresmaeili ◽  
S.G. Shabestari ◽  
S.M.A. Boutorabi
Keyword(s):  
Al Alloy ◽  
Porosity Formation ◽  
Reduced Pressure ◽  
Sr Modification ◽  
Alloy Castings ◽  
Modification Treatment

The permeability of Lost Foam pattern coatings for Al alloy castings

2008 ◽  
Vol 43 (16) ◽  
pp. 5441-5447 ◽  
Author(s):  
W. D. Griffiths ◽  
P. J. Davies
Keyword(s):  
Al Alloy ◽  
Alloy Castings ◽  
Foam Pattern ◽  
Lost Foam

Reference Dies for the Evaluation of Tensile Properties of Gravity Cast Al-Si Alloys: An Overview

2014 ◽  
Vol 794-796 ◽  
pp. 71-76 ◽  
Author(s):  
Anilchandra R. Adamane ◽  
Elena Fiorese ◽  
Giulio Timelli ◽  
Franco Bonollo ◽  
Lars Arnberg
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Scientific Literature ◽  
Die Casting ◽  
Al Alloy ◽  
Casting Defects ◽  
Automotive Components ◽  
Foundry Alloys ◽  
Alloy Castings ◽  
Gravity Cast

Aluminium-Silicon (Al-Si) alloys are the most extensively used Al foundry alloys and are widely used in gravity die-casting (GDC) of automotive components. Reference dies are used to characterize the tensile properties of the castings. Among the various die configurations, the ASTM B-108 (also called the Stahl Mold), and the AA Step Mold are most popular in the foundries. Several modifications to the standard dies have been suggested in the scientific literature to obtain better mechanical properties in minimizing casting defects. This work reviews the scientific literature on the effect of different reference dies on the porosity and tensile properties of the Al alloy castings.

Comparative Study of Surface Contaminated Layer on Titanium Aluminum Alloy and Titanium Alloy Investment Castings

2021 ◽  
Vol 1035 ◽  
pp. 602-607
Author(s):  
Zhi Hua Feng ◽  
Xian Fei Ding ◽  
Xin Feng ◽  
Hai Nan ◽  
Ai Bin Zhang
Keyword(s):  
Titanium Alloy ◽  
Aluminum Alloy ◽  
Comparative Study ◽  
Chemical Reaction ◽  
Microhardness Measurement ◽  
Ceramic Mold ◽  
Al Alloy ◽  
Ti Alloy ◽  
Titanium Aluminum ◽  
Alloy Castings

A comparative study of the surface contaminated layer formed by chemical reaction between ceramic-mold and titanium aluminum alloy castings or titanium alloy castings were carried out. The morphology, thickness and hardness of the surface contaminated layer were characterized by means of metalloscopy and microhardness measurement. The results show that surface contaminated layers formed between Ti-Al alloy castings and ceramic-mold, also formed between Ti alloy castings and ceramic-mold. The surface contaminated layers of Ti-Al alloy castings were continuous and compact, their thickness was about 0~90 μm. The surface contaminated layers of titanium alloy castings were not even, their thickness was 0~900 μm. Titanium alloy is more liable to react with the ceramic -mold than the Ti-Al alloy.

Hot cracking of binary Mg–Al alloy castings

2006 ◽  
Vol 417 (1-2) ◽  
pp. 230-238 ◽  
Author(s):  
G. Cao ◽  
S. Kou
Keyword(s):  
Hot Cracking ◽  
Al Alloy ◽  
Alloy Castings

scholarly journals The Relationship between Residual Amount of Sr and Morphology of Eutectic Si Phase in A356 Alloy

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3222 ◽  
Author(s):  
Wenda Zhang ◽  
Shixuan Ma ◽  
Zhenhua Wei ◽  
Peikang Bai
Keyword(s):  
A356 Alloy ◽  
Sand Mold ◽  
Sr Modification ◽  
Treatment Processes ◽  
Modification Effect ◽  
Residual Amount ◽  
Eutectic Si ◽  
The Relationship ◽  
Modification Treatment ◽  
Alloy Cast

This paper studied the relationship between the residual amount of Sr and the morphology of the eutectic Si phase in A356 obtained through different modification treatment processes; additionally, the cooling rates of molds were studied. The eutectic Si phase revealed a satisfactory modification effect at residual Sr amounts above 0.01 wt % in A356 alloys cast using an iron mould. Complete modification of the eutectic Si phase could be achieved at a Sr additive amount 0.03 wt % in an A356 melt. The addition of higher amounts of Sr (~0.04–0.06 wt %) did not improve the modification effect. With the addition of 0.06 wt % Sr into A356 alloy melt and holding at 750 °C, the anti-fading capacity of Sr modification effect could be sustained for 120 minutes. More Sr is needed to obtain a good modification of eutectic Si for an A356 alloy cast using a sand mold.

Light Alloy Castings for Automotive Applications: The Case of Al vs. Mg

2006 ◽  
Vol 519-521 ◽  
pp. 1801-1808 ◽  
Author(s):  
Carlos H. Cáceres
Keyword(s):  
Cast Iron ◽  
Primary Energy ◽  
Al Alloy ◽  
Iron And Steel ◽  
Automotive Components ◽  
Casting Alloys ◽  
Structural Applications ◽  
Alloy Castings ◽  
The Cost ◽  
Alloy Cast

The economical and environmental effects of mass reduction through Al and Mg primary alloys substitutions for cast iron and steel in automotive components are discussed using M.F. Ashby’s penalty functions method. The viability of Mg alloy substitutions for existing Al alloy cast components is also considered. The cost analysis shows that direct, equal-volume, Al alloy substitutions for cast iron and steel are the most feasible in terms of the CAFE liability, followed by substitutions involving flat panels of prescribed stiffness. When the creation of CO2 associated to the production of Al and Mg is considered, the potential gasoline savings over the lifespan of the car compensate for the intrinsic environmental burden of Al in all applications, while electrolytic Mg substitutions for cast iron and steel are feasible for equal volume and panels only. Magnesium produced by the Pidgeon thermal process appears to be too primary energy intensive to be competitive in structural applications. Magnesium substitutions for existing Al alloy beams and panels are generally unviable. The current higher recycling efficiency of Al casting alloys confers Al a significant advantage over Mg alloys.

scholarly journals Mechanical Properties and Melt Quality Relationship of Sr-modified Al-12Si Alloy

2015 ◽  
Vol 15 (4) ◽  
pp. 134-140 ◽  
Author(s):  
M. Uludağa ◽  
M. Uyaner ◽  
F. Yilmaz ◽  
D. Dişpinar
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Tensile Testing ◽  
Porosity Formation ◽  
Reduced Pressure ◽  
Cast Part ◽  
Pressure Test ◽  
Relationship Of ◽  
Good Agreement

Abstract The formation of oxide film on the surface of aluminium melts, i.e. bifilms, are known to be detrimental when they are incorporated into the cast part. These defects causes premature fractures under stress, or aid porosity formation. In this work, Al-12 Si alloy was used to cast a step mould under two conditions: as-received and degassed. In addition, 10 ppi filters were used in the mould in order to prevent bifilm intrusion into the cast part. Reduced pressure test samples were collected for bifilm index measurements. Samples were machined into standard bars for tensile testing. It was found that there was a good agreement with the bifilm index and mechanical properties.

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