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1
Content available Influence of Remelting AlSi9Cu3 Alloy with Higher Iron Content on Mechanical Properties
100%
Matejka M. , Bolibruchova D.
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tom Vol. 18, iss. 3
25--30
EN
The paper deals with influence of multiple remelting on AlSi9Cu3 alloy with higher iron content on chosen mechanical properties. Multiple remelting may in various ways influence mechanical, foundry properties, gas saturation, shrinkage cavity, fluidity etc. of alloy. Higher presence of iron in Al-Si cast alloys is common problem mainly in secondary (recycled) aluminium alloys. In Al-Si alloy the iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which decreases mechanical properties. Iron in the used alloy was increased to about 1.4 wt. %, so that the influence of increased iron content can be investigated. In the paper, the effect of multiple remelting is evaluated with respect to the resulting mechanical properties in cast state, after the heat treatment (T5) and after natural aging. From the obtained results it can be concluded that the multiple remelting leads to change of chemical composition and affect the mechanical properties.
2
Content available Application of Natural and Artificial Ageing on Multiply Remelted AlSi9Cu3 Alloy
100%
Matejka M. , Bolibruchova D.
Archives of Foundry Engineering
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2019
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tom iss. 2
60--66
EN
This article focuses on the study of the influence of remelting and subsequent natural and artificial ageing on the structure of recycled AlSi9Cu3 alloy with increased iron content. The assessed changes in eutectic silicon and iron-based intermetallic phases were carried out using optical and scanning electron microscopy. The degradation of the eutectic silicon morphology due to remelting occurred only at the highest numbers of remelting. The effect of remelting the investigated alloy, which is accompanied by a gradual increase in wt. % Fe, began to manifest significantly through a change in the length of the ferric phases after the fourth remelting. As expected, the artificial ageing process has proven to be more effective than natural ageing. It has led to a change in the eutectic silicon morphology and has been beneficial in reducing the lengths of adverse ferric phases. The use of alloys with higher numbers of remelting, or with greater “contamination”, for the manufacture of shape-challenging castings is possible when using a suitable method of eliminating the negative factors of the remelting process. The results of our investigation show a suitable method of the above elimination the application of heat treatment T5 – via artificial ageing.
3
Content available Effect of Remelting on Microstructure of the AlSi9Cu3 Alloy with Higher Iron Content
100%
Matejka M. , Bolibruchova D.
Archives of Foundry Engineering
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2018
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tom Vol. 18, iss. 4
25--30
EN
Secondary or multiple remelted alloys are common materials used in foundries. For secondary (recycled) Al-Si-Cu alloys, the major problem is the increased iron presence. Iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which may negatively affect the structure. The paper deals with effect of multiple remelting on the microstructure of the AlS9iCu3 alloy with increased iron content to about 1.4 wt. %. The evaluation of the microstructure is focused on the morphology of iron-base intermetallic phases in caste state, after the heat treatment (T5) and after natural aging. The occurrence of the sludge phases was also observed. From the obtained results can be concluded that the multiple remelting leads to change of chemical composition, changes in the final microstructure and also increases sludge phases formation. The use of heat treatment T5 led to a positive change of microstructure, while the effect of natural aging is beneficial only to the 3rd remelting.
4
Content available Study of the Properties of the AlSi9Cu3 Alloy Depending on the Ratio of Returnable Material in the Batch
85%
Matejka M. , Bolibruchová D. , Chalupová M. , Matejka M. , Bolibruchová D. , Chalupová M.
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nr 1
5
Content available Study of AlSi9Cu3 Alloy Crystallization Process with Increased Iron Content at Different Number of Remelts
80%
Matejka M. , Bolibruchova D. , Kasińska J. , Kuriš M.
Archives of Foundry Engineering
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2020
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tom Vol. 20, iss. 1
79--83
EN
Monitoring the solidification process is of great importance for understanding the quality of the melt, for controlling it, and for predicting the true properties of the alloy. Solidification is accompanied by the development of heat, the magnitude of which depends on the different phases occurring during solidification. Thermal analysis is now an important part of and tool for quality control, especially when using secondary aluminium alloys in the automotive industry. The effect of remelting on the change of crystallization of individual structural components of experimental AlSi9Cu3 alloy was determined by evaluation of cooling curves and their first derivatives. Structural analysis was evaluated using a scanning electron microscope. The effect of remelting was manifested especially in nucleation of phases rich in iron and copper. An increasing number of remelts had a negative effect after the fourth remelting, when harmful iron phases appeared in the structure in much larger dimensions.
6
Content available remote The synthetic nodular cast irons with metallurgical silicon carbide additive
80%
Vaško A. , Skočsovský P. , Matejka M.
Archiwum Odlewnictwa
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2004
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tom R. 4, nr 11/2
276--282
EN
The contribution deals with comparing of microstructure, mechanical properties and micro-mechanisms of failure of synthetic nodular cast irons with graded amount of steel scrap in a charge. Individual meltages were regulated to required chemica1 composition alternatively by FeSi or SiC. Several advantages of metallurgical silicon carbide as a consequence of its considerably graphitizing and ferritizing influence result from the experiments. The use of metallurgical silicon carbide is also economically advantageous.
PL
W artykule przedstawiono porównanie mikrostruktury, właściwości mechanicznych i przełomów rodzajów żeliwa sferoidalnego z określoną ilością stalowego wsadu. Poszczególne wytopy poddane zostały analizie składu chemicznego, ze zwróceniem szczególnej uwagi na zawartość FeSi oraz SiC. Z przeprowadzonych badań wynika, że więcej zalet posiada metalurgiczny węglik krzemu, wskutek jego wyraźnie grafityzującego i ferrytyzującego działania. Stosowanie metalurgicznego węglika krzemu korzystne jest również z ekonomicznego punktu widzenia.
7
Content available Influence of Zr on AlSi9Cu1Mg Alloy Cast in Ceramic
80%
Matejka M. , Kuriš M. , Bolibruchova D. , Pastirčák R.
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tom Vol. 20, iss. 2
13--18
EN
The article focuses on the analysis of the effect of Zr on the properties of the aluminium alloy AlSi9Cu1Mg. The effect of Zr was evaluated depending on the change in mechanical properties and heat resistance during a gradual addition of Zr with an increase of 0.05 wt. % Zr. Half of the cast experimental samples from each variant were heat treated by precipitation hardening T6 (hereinafter HT). The measured values in both states indicate an improvement of the mechanical properties, especially in the experimental variants with a content of Zr ≥ 0.20 wt. %. In the evaluation of Rm, the most significant improvement occurred in the experimental variant with an addition of Zr 0.25 wt. % after HT and E in the experimental variant with addition of Zr 0.20 wt. % after HT. Thus, a difference was found from the results of the authors defining the positive effect of Zr, in particular at 0.15 wt. %. When evaluating the microstructure of the AlSi9Cu1Mg alloy after Zr alloying, Zr phases are already eliminated with the addition of Zr 0.10 wt. %. Especially at higher levels of Zr ≥ 0.20 wt. %, long needle phases with slightly cleaved morphology are visible in the metal matrix. It can be stated that a negative manifestation of Zr alloying is expressed by an increase in gassing of experimental alloys, especially in variants with a content of Zr ≥ 0.15 wt. %. Experimental samples were cast into ceramic moulds. The development of an experimental alloy AlSi9Cu1Mg alloyed with Zr would allow the production of a more sophisticated material applicable to thin-walled Al castings capable of operating at higher temperature loads.
8
Content available Crystallization of the Structural Components of Multiple Remelted AlSi9Cu3 Alloy
80%
Matejka M. , Bolibruchova D. , Kuriš M.
Archives of Foundry Engineering
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2021
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tom Vol. 21, iss. 2
41--45
EN
At present, Al-Si-Cu based alloys (with a typical representative AlSi9Cu3 alloy) represent more than half of the castings used in various industries (automotive, aerospace and electrical engineering). These are most often sub-eutectic (exceptionally eutectic) alloys with a content of 6 to 13 wt. % Si and 1 to 5 wt. % Cu. The aim of the paper is to point out the importance of the evaluation of input raw materials that determines the overall properties of the casting and the costs invested in its production. A negative impact on performance can be expected when using an alloy made up of a high proportion of recycled material, despite its economic benefits. Experimental alloys were evaluated based on the results of crystallization process and a combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and deep etching. The effect of remelting and increasing the remelted returnable material in the batch was manifested especially in the crystallization of iron-rich phases. The negative effect of remelting on the structural components was manifested after the fourth remelting. Gradual increase of remelted returnable material in the batch causes harmful changes in the crystallization process.
9
Content available Study of the Properties of the AlSi9Cu3 Alloy Depending on the Ratio of Returnable Material in the Batch
80%
Matejka M. , Bolibruchová D. , Chalupová M.
Archives of Metallurgy and Materials
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2021
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tom Vol. 66, iss. 1
15--23
EN
Recycling of aluminium returnable material through its reuse is now an essential component of the production of aluminium alloy castings. The main goal is to find a suitable ratio of the primary alloy and the returnable material in the batch, thus determining the right compromise between the price and the quality of the casting. Experimental alloys were evaluated by thermal analysis, combination of structural analytical techniques and selected mechanical properties. The alloys were also subjected to tearing susceptibility testing. The increase in the returnable material amount resulted in changes in the alloy properties at the first increase in volume to 20%. After exceeding the balanced ratio (50:50), there was considerable degradation of the microstructure, failure to achieve the minimum values of some mechanical properties required by the standard, and the alloy showed increased susceptibility to tearing.
10
Content available Application of Natural and Artificial Ageing on Multiply Remelted AlSi9Cu3 Alloy
80%
Matejka M. , Bolibruchová D.
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nr 2
11
Content available Effect of Ti on Selected Properties of AlSi7Mg0.3Cu0.5 Alloy with Constant Addition of Zr
71%
Bolibruchová D. , Kuriš M. , Matejka M. , Major-Gabryś K. , Vicen M. , Bolibruchová D. , Kuriš M. , Matejka M. , Major-Gabryś K. , Vicen M.
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12
Content available Effect of the Precipitation Hardening on the Structure of AlSi7Mg0.3Cu0.5 Alloy with Addition of Zr and Combination of Zr and Ti
71%
Kuriš M. , Bolibruchova D. , Matejka M. , Kantoríková E. , Kuriš M. , Bolibruchova D. , Matejka M. , Kantoríková E.
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nr 1
13
Content available Effect of Ti on Selected Properties of AlSi7Mg0.3Cu0.5 Alloy with Constant Addition of Zr
71%
Bolibruchová D. , Kuriš M. , Matejka M. , Major-Gabryś K. , Vicent M.
Archives of Metallurgy and Materials
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2021
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tom Vol. 66, iss. 1
65--72
EN
The article is focused on the synergic effect of constant content of Zr and higher content of Ti on mechanical properties Al-Si alloy. The Ti additions were in proportions of 0.1, 0.2 and 0.3 wt.% Ti. The casting process was carried out in ceramic molds, created for the investment casting technology. Half of the experimental samples were processed by precipitation curing T6. The measured results were compared with primary alloy AlSi7Mg0.3 and experimental alloy AlSi7Mg0.3Cu0.5Zr0.15. In variant with addition 0.1 wt. %, the tensile strength Rm increased by 1,5% but the elongation AM decreased to 40%. Variants with 0.2 and 0.3 wt. % addition of Ti achieved similar Rm but approximately 40% decrease in AM. However, it is interesting that yield strength Rp0.2 increased for all variants by approximately 14 to 20%. The results point out the possibility of developing a more sophisticated alloy for automotive industry.
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