Effect of Rare Earth Metals on Diffusion and Porosity Deformation of Al-11Si-2Cu Cast Alloy

2016 ◽  
Vol 1133 ◽  
pp. 305-309
Author(s):  
Roslee Ahmad ◽  
M.B.A. Asmael
Keyword(s):  
Rare Earth ◽  
Cast Alloy ◽  
Rare Earth Metals ◽  
Optical Microscope ◽  
Casting Alloy ◽  
Cu Alloy ◽  
Porosity Defects ◽  
Rare Earth Additions

The effect of rare earth additions on diffusion and porosity deformation of Al-11Si-Cu alloy was investigated. The microstructure was characterized by optical microscope. By adding small amount of La and Ce, the porosity can be reduced. As the amount of La and Ce were increased, the porosity defects were diffused and increased in microstructure. RE intermetallic indicates Al-Cu phase interrupted the quality of Al-Si-Cu casting alloy.

Influence of Casting Conditions and Alloy Additions on the Zn22Al2Cu Structure

2012 ◽  
Vol 326-328 ◽  
pp. 547-554 ◽  
Author(s):  
Rafał Michalik ◽  
A. Tomaszewska ◽  
H. Woźnica
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Optical Microscope ◽  
Alloy Structure ◽  
Unmodified Alloy ◽  
X Ray ◽  
Total Replacement ◽  
Cu Alloy ◽  
Cu Alloys

Zn-Al-Cu alloys are characterized by a number of beneficial properties that include good castability, good tribological properties and low energy input for forming the product. When compared to bronze, Zn-Al-Cu alloys have a lower density. Properties of Zn-Al-Cu can be improved by the partial or total replacement of copper with silicon and rare earth element additions. In the literature there are few studies on the effect of casting conditions and modifying the chemical composition through the introduction of alloy micro-additives on the alloy structure. The aim of this study was to determine the effect of casting conditions and silicon and rare earth element additions on the structure of Zn-22% Al-2%Cu alloy. The subjects examined were the unmodified alloy, the alloy with 1.5% Si and the alloy with 1.5% Si and rare earth elements (mich metal). Samples were cast in sand and graphite molds. The liquidus temperature for each of these examined samples was determined. Structure examinations were carried out in samples taken from the top, center and bottom of the ingot. In order to determine the microstructure of the examined structures metallographic examinations using an optical microscope and a scanning electron microscope with energy dispersive spectroscopy (EDS) capabilities, an X-ray microscope, was performed. Quantitive analysis on specific, characteristic microzones was performed based on the EDS X-ray spectroanalysis results.

Effect of rare-earth metals on the quality of structural steel

Metallurgist ◽  
1966 ◽  
Vol 10 (10) ◽  
pp. 574-577
Author(s):  
R. P. Konovalov ◽  
G. V. Bulgakov ◽  
N. I. Ignatov ◽  
Yu. V. Kryakovskii
Keyword(s):  
Rare Earth ◽  
Structural Steel ◽  
Rare Earth Metals

Effect of Lanthanum Addition on Fluidity of Complex Al-11Si-Cu-Mg Cast Alloy

2015 ◽  
Vol 1119 ◽  
pp. 490-494
Author(s):  
Roslee Ahmad ◽  
M.B.A. Asmael
Keyword(s):  
Rare Earth ◽  
Eutectic Alloy ◽  
Rare Earth Metal ◽  
Cast Alloy ◽  
Earth Metal ◽  
Optical Microscope ◽  
Silica Particles ◽  
La Addition ◽  
The Rare Earth

This research was to determine the effect of rare earth metal (REM) on the fluidity of eutectic Al-11Si-Cu-Mg cast alloy. The rare earth metal used here is Lanthanum to produce Al-11Si-Cu-Mg-0.1La, Al-11Si-Cu-Mg-0.5La and Al-11Si-Cu-Mg-1.0La alloys. The fluidity was measured by permanent spiral mold, pre-heated at 450°C. The microstructure was characterized by optical microscope. The fluidity of complex Al-11Si-Cu-Mg eutectic alloy decreased with the increase of La addition. The 1.0 % of La addition led to refinement of silica particles, which reduced the fluidity length by 25%.

scholarly journals The Effect of Rare Earth Metals Alloying on the Internal Quality of Industrially Produced Heavy Steel Forgings

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5160
Author(s):  
Petr Jonšta ◽  
Zdeněk Jonšta ◽  
Silvie Brožová ◽  
Manuela Ingaldi ◽  
Jacek Pietraszek ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Internal Quality ◽  
Experimental Development ◽  
Steel Forging ◽  
Different Types ◽  
Steel Ingots ◽  
Standard Production ◽  
Grade Steel

The paper presented the findings obtained by industrial research and experimental development on the use of rare earth metals (REMs) in the production of heavy steel ingots and their impact on the internal quality of the 42CrMo4 grade steel forging. REMs alloying was carried out after vacuuming the steel. A relatively large melting loss of cerium (about 50%) and its further decrease in casting due to reoxidation were observed. Refinement of structure and better mechanical properties of forged bar containing about 0.02 wt.% of Ce compared to that of the standard production were not achieved. The wind power shaft with content of about 0.06 wt.% of Ce showed high amount of REM inclusions, which were locally chained, and in some cases, initiated cracks. Four stoichiometrically different types of REM inclusions were detected in forgings, namely (La-Ce)2O2S + (La-Ce)O2 + SiO2 (minority); oxygen, phosphorus, arsenic, and antimony bound to lanthanum and cerium probably bonded with iron oxides La + Ce, MgO, Al2O3 a SiO2; (La-Ce)2O2S, FeO, SiO2, and CaO or CaS.

The quality of tube steel modified with rare-earth metals

Metallurgist ◽  
1974 ◽  
Vol 18 (5) ◽  
pp. 342-346
Author(s):  
V. T. Tereshchenko ◽  
I. P. Leshchenko ◽  
E. V. Tin'kova ◽  
Yu. A. Skladnov ◽  
L. S. Gorokhov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Tube Steel

Economics of the improvement of the quality of steels and alloys by alloying with rare-earth metals

Metallurgist ◽  
1976 ◽  
Vol 20 (8) ◽  
pp. 538-541
Author(s):  
I. N. Ivanov ◽  
N. I. Astakhova
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals

Magnetic susceptibility of liquid heavy rare earth metals

1979 ◽  
Vol 40 (C5) ◽  
pp. C5-260-C5-261 ◽  
Author(s):  
M. Müller ◽  
E. Huber ◽  
H.-J. Güntherodt
Keyword(s):  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Rare Earth Metals ◽  
Heavy Rare Earth
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