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1

Zastosowanie badań termicznych na przykładzie analizy termiczno-derywacyjnej wybranych stopów odlewniczych magnezu i aluminium

Król M., Tański T., Snopiński P.

LAB Laboratoria, Aparatura, Badania

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2017

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R. 22, nr 3

36--40

2

In situ-formed, low-cost, Al-Si nanocomposite materials

Guba P., Gesing A.J., Sokolowski J., Conle A., Sobiesiak A., Das S. K.

Journal of Achievements in Materials and Manufacturing Engineering

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2017

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Vol. 84, nr 1

5--22

EN

Aluminum-Silicon (Al-Si) alloys are the “bread-and-butter” of the aluminum foundry industry being cast at an annual rate of over 2 million tonnes/year in North America for use mainly in transportation. Coarse microstructure of these alloys limits their specific mechanical properties and consequently their potential for vehicle lightweighting. Purpose: We report on a new family of cast Al-Si alloys producing in-situ formed nanocomposites of up to 25 vol.% ultrafine equiaxed silicon particles in Al alloy matrix which can be ductile, or reinforced by nano-scale spinodal constituents. Design/methodology/approach: The hypereutectic Al-Si-X alloy (A390) was melted, solidified and cooled on the novel High Pressure Die Casting Universal Metallurgical Simulator and Analyser Technology Platform (HPDC UMSA) at specific process parameters. The HPDC cast samples consecutively were solution treated and artificially aged to spheroidize the Si and to dissolve the intermetallics in Al(SS) and to re-precipitate them in the solid state as nano-sized spinodal structures. The heat treatment was performed using the High Temperature UMSA Technology Platform. Findings: The nano scale structure of these new materials gives them significantly improved strength, hardness, and wear resistance while retaining adequate toughness and ductility for applications in the transportation applications. Research limitations/implications: Desired composite nanostructures have been produced and characterized in-situ in small laboratory test samples. Practical implications: These new materials can be produced by conventional casting technologies such as continuous strip casting, or high-pressure die-casting from conventional low-cost Al-Si melts. Originality/value: These materials can be produced with a significantly higher volume fraction of ultrafine Si dispersoids than has been done to date in in-situ formed materials, while retaining and improving the density-specific mechanical properties.

3

Cooling rate and chemical composition influence on structure of Al-Si-Cu alloys

Krupiński M., Labisz K., Rdzawski Z., Pawlyta M.

Journal of Achievements in Materials and Manufacturing Engineering

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2011

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Vol. 45, nr 1

13--22

EN

Purpose: The aim of this work is to perform the investigation of cooling rate influence as well as rare earth metals modification on microstructure of the AC-AlSi7Cu3Mg and AC-AlSi12CuNiMg cast aluminium alloys. In the work also artificial neural networks were applied for investigations of the influence of the alloying additives on the properties of the AC-4XXX alloy. Design/methodology/approach: In the work the thermo - derivative analysis was applied for the reason to determine changes occurred in the Al-Si-Cu alloy caused by cooling rate change in a range between 0.1 and 1.4°C/s as well chemical composition of the investigated alloy. Also artificial neural networks were applied for prediction of the chemical composition and heat treatment parameters and influence on mechanical properties of the investigated aluminium alloys. Findings: The performed investigation are discussed for the reason of an possible improvement of thermal and structural properties of the alloy. Practical implications: The aim of the carried out investigations was to work out a computer aided tool for prediction of mechanical properties on the basis of registered parameters during the technological process as well as controlling the process in real time, which can be useful for foundry and cast industry for achieving of material with assumed properties. Originality/value: Chemical composition and cooling rate applied for the alloy influences the crystallisation process of the phases and eutectics, and that fore also the microstructure and determines at the same time the properties of these aluminium alloys. The achieved results can be used also for liquid metal processing in science and industry and obtaining of a required alloy microstructure and properties influenced by a proper production conditions. The determination of the technological process parameters as well chemical composition allows it to predict the material properties.

4

Influence of thermo-derivative analysis conditions on microstructure of the Al-Si-Cu alloy

Dobrzański L. A., Krupiński M., Labisz K., Rdzawski Z.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 2 spec.

19--22

EN

Microstructure change of the metals and alloys as a result of variable crystallisation conditions also by mind of cooling rate change influence the mechanical properties. In this work there are presented the interdependences between the cooling rate, chemical composition and microstructure of the cast aluminium alloy Al–Si–Cu as a result of the thermo-derivative analysis, using the UMSA (Universal Metallurgical Simulator and Analyzer) device. An important tool for the microstructure evaluation of the Al type AC-AlSi7Cu3Mg alloy was the light and electron scanning microscopy technique.

5

Thermal and mechanical characteristics of cast Mg-Al-Zn alloy

Dobrzański L. A., Król M.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1

27-30

EN

This work presents effect of cooling rate on the grain size, mechanical properties and thermal characteristic results of MCMgAl9Zn1 cast alloy. The solidification process was studied using the cooling curve and crystallization curve at solidification rate ranging from 0.6°C/s up to 2.4°C/s. It was determined that the higher solidification rate increases the magnesium dendrite nucleation temperature. In addition, it was observed that the non-equilibrium solidus temperature and the grain size constituent decreases when the solidification rate increases.

6

Derivative thermo analysis of the Al-Si cast alloy with addition of rare earths metals

Krupiński M., Labisz K., Dobrzański L. A., Rdzawski Z.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1

79-82

EN

In this paper the dependence between chemical composition, structure and cooling rate of Al-Si aluminium cast alloy was investigated. For studying of the structure changes the thermo-analysis was carried out, using the UMSA (Universal Metallurgical Simulator and Analyzer) device. For structure investigation optical and electron scanning microscopy was used, phase and chemical composition of the Al cast alloy also using qualitative point-wise EDS microanalysis.

7

Structure investigation of the Al-Si-Cu alloy using derivative thermo analysis

Krupiński M., Labisz K., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 34, nr 1

47-54

EN

Purpose: This research work presents the investigation results of derivative thermoanalysis performed using the UMSA device (Universal Metallurgical Simulator and Analyzer). The material used for investigation was an Al-Si-Cu alloy known as AC-AlSi7Cu3Mg grade aluminium cast alloy. Design/methodology/approach: As a result of this research the cooling rate influence on structure and mechanical properties changes, especially HB Hardness was investigated. The cooling rate was set in a variable range of ~0.2 oC/s to ~1.25 oC/s. In this work structure changes were determined concerning the structure, especially the dendrites and grains and particle distribution in the aluminium matrix. Findings: The reason of this work was to determine the optimal cooling rate values, to achieve good mechanical properties for protection of this aluminium cast alloy from losing their work stability and to make it more resistant to action in hard working conditions. For investigations of the aluminium samples hardness measurements of the different sample areas were performed. The material was examined metallographically and analyzed qualitatively using light and scanning electron microscope as well as the area mapping and point-wise EDS microanalysis. The performed investigation are discussed for the reason of an possible improvement of thermal and structural properties of the alloy. The investigation revealed the formation of aluminium reach (. -Al) dendrites and also the occurrence of the .+ß eutectic, the ternary eutectic .+Al2Cu+ß, as well the occurrence of the Fe and Mn containing phase was confirmed. Practical implications: In the metal casting industry, an improvement of component quality depends mainly on better control over the production parameters. Originality/value: This work provides also a better understanding of the thermal characteristics and processes occurred in the new developed near eutectic Al–Si-Cu alloy. The achieved results can be used for liquid metal processing in science and industry and obtaining of a required alloy microstructure and properties influenced by a proper production conditions.

8

Effect of cooling rate on the solidification behaviour of MC MgAl6Zn1 alloy

Dobrzański L. A., Król M., Tański T., Maniara R.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 1

65-69

EN

Purpose: The goal of this paper is to present the thermal characteristics of magnesium alloy using the novel Universal Metallurgical Simulator and Analyzer Platform. Design/methodology/approach: The objective of this work is determine the liquidus, solidus temperature and beginning nucleation temperature to understanding crystallization of magnesium alloys. Findings: The research show that the thermal analysis carried out on UMSA Technology Platform is an efficient tool for collect and calculate thermal parameters. It was determined that the higher solidification rate decreases the solidus temperature. In addition, it was observed that the beginning of nucleation of .(Mg)-ß(Mg-Mg17Al12) eutectic temperature constituent increases when the solidification rate increases. Research limitations/implications: This paper presents results for one alloy – MC MgAl6Zn1 only, cooled with three different solidifications rate i.e. 0.6, 1.2 and 2.4oC/s, for assessment for the liquidus, solidus temperatures and describe a beginning of nucleation of .(Mg)-ß(Mg-Mg17Al12) eutectic. Practical implications: The parameters described can be applied in metal casting industry for selecting magnesium ingot preheating temperature for semi solid processing to achieve requirements properties or to predict how to prepare parameters to heat treatment. Originality/value: The paper contributes to better understanding and recognition an influence of different solidification condition on non-equilibrium thermal parameters of magnesium alloys.

9

A Case Based Reasoning aluminium thermal analysis platform for the prediction of W319 Al cast component characteristics

Pelayo G., Sokolowski J. H., Lashkari R.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 36, nr 1

7-17

EN

Purpose: This paper presents the research on the development of the Aluminum Thermal Analysis Technology Platform (AlTAP) utilizing a Case Based Reasoning (CBR) Caspian shell for interpretation of industrial cooling curves and predicting alloy and cast component characteristics. Design/methodology/approach: CBR being a branch of Artificial Intelligence (AI) that solves problems based on understanding and adaptation of previous experiences is suitable for interpretation of the AlTAP results since this is a knowledge intensive activity which requires a fair amount of experience. Findings: The integrated AlTAP and CBR system was found to be useful for the prediction of melt thermal characteristics, cast component mechanical and structural properties. Practical implications: Industrial trials confirmed the technical capabilities of the AlTAP/CBR Platform for the on-line quality control and prediction of 319 melt characteristics and the aluminum engine block’s (Cosworth casting process) engineering specifications. Originality/value: An automated AlTAP Platform integrated with a CBR system is a new Quality Control concept in the area of the aluminum automotive casting.

10

Effect of cooling rate on the solidification behavior of magnesium alloys

Dobrzański L.A., Król M., Tański T., Maniara R.

Archives of Computational Materials Science and Surface Engineering

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2009

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Vol. 1, nr 1

21-24

EN

Purpose: The goal of this paper is to present the thermal characteristics of magnesium alloy using the novel Universal Metallurgical Simulator and Analyzer Platform. Design/methodology/approach: The objective of this work is determine the liquidus, solidus temperature and beginning nucleation temperature to understanding crystallization of magnesium alloys. Findings: The research show that the thermal analysis carried out on UMSA Technology Platform is an efficient tool for collect and calculate thermal parameters. The formation temperatures of various thermal parameters and hardness are shifting with an increasing cooling rate. Research limitations/implications: This paper presents results for one alloy. MCMgAl12Zn1 only, cooled with three different solidifications rate i.e. 0.6, 1.2 and 2,4 �°C/s, for assessment for the liquidus, solidus temperatures and describe a beginning of nucleation of �α(Mg)-β(Mg-Mg17Al12) eutectic and its influence on the mechanical properties. Further investigations should be concentrating on assessment an influence of different solidification rate on microstructure. Practical implications: The parameters described can be applied in metal casting industry for selecting magnesium ingot preheating temperature for semi solid processing to achieve requirements properties. Originality/value: The paper contributes to better understanding and recognition an influence of different solidification condition on non-equilibrium thermal parameters of magnesium alloys.

11

Thermal analysis of the MCMgAl9Zn1

Dobrzański L. A., Król M., Tański T., Maniara R.

Archives of Materials Science and Engineering

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2008

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Vol. 34, nr 2

113-116

EN

Purpose: The goal of this paper is to present the new methodology to determine the thermal characteristics of magnesium alloy using the novel Universal Metallurgical Simulator and Analyzer Platform. Design/methodology/approach: The experiments were performed using the novel Universal Metallurgical Simulator and Analyzer Platform. Material used in this experiment is experimental magnesium alloy made as-cast. Findings: The research show that the thermal analysis carried out on UMSA Technology Platform is an efficient tool for collect and calculate thermal parameters. The formation temperatures of various thermal parameters are shifting with an increasing cooling rate. Research limitations/implications: This paper presents results for one alloy . MCMgAl9Zn1 only cooled with two different solidifications rate i.e. 0.6 and 2°C/s, for assessment for the liquidus, solidus temperatures and describe a beginning of nucleation of α(Mg)-β(Mg-Mg17Al12) eutectic. Further investigations should be concentrating on assessment an influence of different solidification rate on microstructure and mechanical properties. Practical implications: The parameters described can be applied in metal casting industry for selecting magnesium ingot preheating temperature for semi solid processing. Originality/value: The paper contributes to better understanding and recognition an influence of different solidification condition on non-equilibrium thermal parameters of magnesium alloys.

12

Effect of cooling rate on the solidification behavior of MC MgAl6Zn1 alloy

Dobrzański L. A., Król M., Tański T., Maniara R.

Archives of Materials Science

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2008

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Vol. 29, nr 3

110-117

EN

In this work effect of cooling rate on thermal characteristic results of MC MgAl6Zn1 cast alloy have been described. The solidification process was studied using the cooling curve and crystallization curve at solidification rate ranging from 0.6 degree C/s up to 2.4 degree C/s. It was determined that the higher solidification rate decreases the solidus temperature. In addition, it was observed that the beginning of nucleation of alpha(Mg)-betha(Mg-Mg17Al12) eutectic temperature constituent increases when the solidification rate increases.

13

Derivative thermo analysis of the near eutectic Al-Si-Cu alloy

Dobrzański L. A., Krupiński M., Labisz K.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 4

37-40

EN

For determining of the dependence between cooling Speer, chemical composition and structure of the Al-Si-Cu aluminium cast alloy the thermo-analysis was carried out, using the UMSA device (Universal Metallurgical Simulator and Analyzer), next the optical and electron scanning microscopy was used for investigation of the structure, phase and chemical composition of the AC-AlSi7Cu3Mg grade Al cast alloy also using the EDS microanalysis as well the EBSD technique.