Crystallization kinetics of Zn alloys modified with Ce, La, Sr, Ti, B

• Autorzy: Krupińska B. , Labisz K. , Dobrzański L. A. , Rdzawski Z.
• Języki publikacji: EN

Abstrakty

EN

Purpose: This paper presents the investigation results of cooling rate influence on microstructure of the Zn-Al cast alloy. Thermo-derivative analysis of the investigated alloys was performed using the UMSA device (Universal Metallurgical Simulator and Analyzer). This device makes it possible to characterise the important points of the crystallised alloy diagram including: phase and eutectics crystallisation, as well liquidus/solidus points. The material used for investigation was the ZL8 alloy. Design/methodology/approach: Moreover the analysis of cooling rate influence on the derivative curve changes was performed as a result of the measured crystallisation kinetic changes. For the assessment of the cooling rate influence on the mechanical properties also hardness measurements were performed using the Rockwell hardness device. Findings: The treated sample is without holes, cracks and defects as well as has a slightly higher hardness value compared to the as-cast material. Research limitations/implications: Microstructure and mechanical properties investigations of the investigated alloy was performed for the reason of alloying additives influence on alloy microstructure and properties change, the microstructure was 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. Practical implications: The investigated material can find its use in the foundry industry; an improvement of component quality depends mainly on better control over the production parameters. Originality/value: This work provides better understanding of the thermal characteristics and processes occurred in the new developed 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 condition.

Słowa kluczowe

EN

metallic alloy; kinetic crystallization; DTA

PL

stop metalowy; krystalizacja kinetyczna; DTA

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 42, nr 1-2
• Strony: 50--57
• Opis fizyczny: Bibliogr. 19 poz., rys., tabl.

Twórcy

autor

Krupińska B.

autor

Labisz K.

autor

Dobrzański L. A.

autor

Rdzawski Z.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

• [1] W.R. Osorio, A. Garcia, Modeling dendritic structure and mechanical properties of Zn–Al alloys as a function of solidification conditions, Materials Science and Engineering A 325 (2002) 103-111.
• [2] W.R. Osorio, C.A. dos Santos, J.M.V. Quaressma, A. Garcia, Mechanical properties as a function of thermal parameters and microstructure of Zn–Al castings, Journal of Materials Processing Technology 143-144 (2003) 703-709.
• [3] A.E. Ares, L.M. Gassa, S.F. Gueijman, C.E. Schvezov, Correlation between thermal parameters, structures, dendritic spacing and corrosion behavior of Zn–Al alloys with columnar to equiaxed transition, Journal of Crystal Growth 310 (2008) 1355-1361.
• [4] L.J. Yang, The effect of casting temperature on the properties of squeeze cast aluminium and zinc alloys, Journal of Materials Processing Technology 140 (2003) 391-396.
• [5] W.T. Kierkus, J.H. Sokolowski, Recent Advances in Cooling Curve Analysis: A New Method for determining the ‘Base Line’ Equation, AFS Transactions 66 (1999) 161-167.
• [6] L.J. Yang, The effect of solidification time in squeeze casting of aluminium and zinc alloys, Journal of Materials Processing Technology 192-193 (2007) 114-120.
• [7] Y.H. Zhu, Phase transformations of eutectoid Zn-Al alloys, Journal of Materials Science 36 (2001) 3973-3980.
• [8] T.J. Chen, Y. Hao, J. Sun, Y.D. Li, Effects of Mg and RE additions on the semi-solid microstructure of a zinc alloy ZA27, Science and Technology of Advanced Materials 4 (2003) 495-502.
• [9] B. Krupińska, L.A. Dobrzański, Z. Rdzawski, K. Labisz, Cooling rate influence on microstructure of the Zn-Al cast alloy, Journal of Achievements in Materials and Manufacturing Engineering 38/2 (2010)115-122.
• [10] E.M. da Costa, C.E. da Costa, F. Dalla Vecchia, C. Rick, M. Scherer, C.A. dos Santos, B.A. Dedavid, Study of the influence of copper and magnesium additions on the microstructure formation of Zn-Al hypoeutectic alloys, Journal of Alloys and Compounds 488/1 (2009) 89-99.
• [11] L. Bäckerud, G. Chai, J. Tamminen, Solidification Characteristics of Aluminum Alloys, AFS, 1992.
• [12] E. Fraś, Alloys crystallisation, WNT, Warsaw, 2003 (in Polish). [13] J. Sobczak, Innovations in foundry, Part 1, Institute of Foundry, Cracow, 2007 (in Polish).
• [14] Z. Górny, Modern plastic molding based on the non-ferrous metals, ZA-PIS, Cracow, 2005.
• [15] R.J. Barnhurst, Gravity casting manual for zinc – aluminium alloys, Noranda Sales, Toronto, 1989, 3.
• [16] A.A Prensyakov, Y.A Gorban, V.V Chervyakova, The aluminium – zinc phase diagram, Russian Journal of Physical Chemistry 6 (1961) 632-633.
• [7] L.A. Dobrzański, Descriptive of metallurgy non-ferrous alloys, Silesian University of Technology Publishing House, Gliwice, 2008.
• [18] Cz. Adamski, Z. Banderek. T. Piwowarczyk, Microstructures of cast alloys of copper and zinc, Silesia, Katowice, 1972.
• [19] B.K. Prasad, O.P. Modi, Slurry wear characteristics of zinc-based alloys: Effects of sand content of slurry, silicon addition to alloy system and traversal distance, Transactions of Nonferrous Metals Society of China 19/2 (2009) 277-286.