Inoculation of aluminium with titanium and boron addition

• Autorzy: Szajnar J. , Wróbel T.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The main aim of studies was to determine mechanism of inocualtion of pure alumnium EN AW-A199.5 structure with addition of titanium and boron, which are introduced to liquid metal in small ammount - less than obligatory standard PN-EN 573-3 (concerning about aluminium purity). Design/methodology/approach: To investigations it was used light microscopy, X-ray Phase Analysis and TEM. Surfaces of samples which were prepared for macrostructure analysis were etched with use of solution of: 50g Cu, 400ml HCl, 300ml HNO3 and 300ml H2O. Surfaces of samples which were prepared for microstructure analysis were etched with use of solution of: 0,5ml HF, 99,5ml H2O. Thin foils for TEM investigations were electropolished with use of 20 ml HClO4 and 80ml CH3OH. Findings: The results of investigations and their analysis show, that increase of size reduction in aluminium EN AW-A199,5 after inoculation with (Ti+B) result from "washers" of type Ti3Al and CuTi2 to heterogeneous nucleation formation. Research limitations/implications: I further research, authors of this paper are going to identifiy the "washers" to heterogeneous nucleation, in aluminium structure after inoculation with zirconium and vanadium addition. Practical implications: The work presents refinement of structure method which are particularly important in continuous and semi - continuous casting where products are used for plastic forming. Large columnar crystals zone result in forces extrusion rate reduction and during the ingot rolling delamination of external layers can occur. Thus, in some cases ingot skinning is needed, which rises the production costs. Originality/value: Contributes to research on size reduction in pure aluminium structure.

Słowa kluczowe

EN

working properties; aluminium; titanium; boron

PL

właściwości eksploatacyjne; aluminium; tytan; bor

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 23, nr 1
• Strony: 51--54
• Opis fizyczny: Bibliogr. 15 poz., fot., rys., tab.

Twórcy

autor

Szajnar J.

autor

Wróbel T.

• Division of Foundry, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Towarowa 7, 44-100 Gliwice, Poland,

Bibliografia

• [1] E. Fraś, Crystallization of metals, WNT, Warsaw, 2003 (in Polish).
• [2] M Robert, E. Zoqui, F. Tanabe, T. Motegi, Producing thixotropic semi-solid A356 alloy: microstructure formation x forming behaviour, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 19-26.
• [3] J. Szajnar, T. Wróbel, Inoculation of primary structure of pure aluminium, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 283-286.
• [4] J. Szajnar, T. Wróbel, Influence of magnetic field and inoculation on columnar structure transformation, Journal of Achievements in Materials and Manufacturing Engineering, 17 (2006) 209-212.
• [5] S. Asai, Recent development and prospect of electromagnetic processing of materials, Science and Technology of Advanced Materials 1 (2000) 191-200.
• [6] S. Argyropoulos, A. Mikrovas, D. Doutre, Dimensionless correlations for forced convection in liquid metals: Part I. Single-phase flow, Metallurgical and Materials Transactions 4/32B (2001) 239-246.
• [7] J. Szajnar, M. Stawarz, T. Wróbel, Inoculation of pure aluminium structure with Ti+B addition in impulse magnetic field, Journal of Achievements in Materials and Manufacturing Engineering 14 (2006) 64-69.
• [8] S. Jura, Modeling research of modyfication process in metals Scientific book of Silesian University of Technology, Mechanic 32, Gliwice, 1968 (in Polish).
• [9] Z. Poniewierski, Crystallization, structure and properties of silumines, WNT, Warsaw, 1989 (in Polish).
• [10] J. Szymszal, E. Krzemień, T. Zając, Modyfication of metals and alloys, Silesian University Publishers, Gliwice, 1984 (in Polish).
• [11] T. Hang, T. Sritharan, P. Seow, Grain refinement of DIN226 alloy at high titanium and boron inoculation levels, Scripta Materiallia 35/7 (1996) 869-872.
• [12] B. Hu, H. Li, Grain refinement of DIN226S alloy at lower titanium and boron addition levels, Journal of Materials Processing Technology 78 (1998) 56-60.
• [13] H. Banghong, L. Hang, Comparison of effects of masters alloy containig titanium and/or boron on the grain size and dendrite arm spacing of DIN226S aluminium alloy, Journal of Materials Science Letters 16 (1997) 1750-1752.
• [14] M. Kciuk, Structure, mechanical properties and corrosion resistance of AlMg5 alloy, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 185-188.
• [15] P. Hirsch, A. Howie, R. Nicholson., D. Pashley, Electron microscopy of thin crystals, Butterworths, Londyn, 1965.