Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy

• Autorzy: Górny M. , Sikora G. , Kawalec M.

Identyfikatory

DOI

10.1515/afe-2016-0045

• Języki publikacji: EN

Abstrakty

EN

The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα-Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control.

Słowa kluczowe

EN

quality management; Al-Cu alloy; fading effect; primary grains of α(Al)

PL

zarządzanie jakością; metalografia; stop Al-Cu; zanik; ziarna pierwotne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 3
• Strony: 35--38
• Opis fizyczny: Bibliogr. 16 poz., il., wykr.

Twórcy

autor

Górny M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

autor

Sikora G.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

autor

Kawalec M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland

Bibliografia

• [1] Nabawy, M., Samuel, A.M., Samuel, F.H. & Doty, H.W. (2011). Investigation of Chemical Additives on the Microstructure and Tensile Properties of Al-2wt%Cu Based Alloys. AFS Transactions. 119, 123-139.
• [2] Huang, B.P. & Zheng, Z.Q. (1998). Independent and combined roles of trace Ma and Ag additions in properties precipitation process and precipitation kinetics of Al-Cu-Li-(Mg)-(Ag)-Zr-Ti alloys. Acta Materialia. 46(12), 4381-4393.
• [3] Eskin, D.G. (2008). Physical Metallurgy of Direct-Chill Casting of Aluminum Alloys, Boca Raton London New York: CRC Press Taylor & Francis Group.
• [4] Górny, M. & Sikora, G. (2015). Effect of Titanium Addition and Cooling Rate on Primary a(Al) Grains and Tensile Properties of Al-Cu Alloy. Journal of Materials Engineering and Performance. 24(3), 1150-1156.
• [5] Górny, M. & Sikora, G. (2014). Effect of Modification and Cooling Rate on Primary Grain in Al-Cu alloy. Archives of Foundry Engineering. 14(3), 21-24.
• [6] Grandfield, J.F., Eskin, D.G., Bainbridge, I.F. (2013). Direct-chill casting of light alloys. New Jersey: John Wiley & Sons, Inc.
• [7] Zhixue, L. Long, D. & Juqiang, C. (2013). Influence of heat treatment on microstructure and tensile properties of a cast Al-Cu-Si-Mn alloy. China Foundry. 10(6), 355-359.
• [8] Wierszyłłowski, I., Wieczorek, S., Stankowiak, A., Samolczyk, J. (2005). Kinetics of transformation during supersaturation and ageing of the Al-4.7 %Cu alloy. Obróbka Plastyczna Metali. 16(5), 31-37.
• [9] Fatmi, M., Ghebouli, B., Ghebouli, M.A., Chihi, T. Ouakdi, E. & Heiba, Z.A. (2013). Study of Precipitation Kinetics in Al-3.7 wt% Cu Alloy during Non-Isothermal and Isothermal Ageing. Chinese Journal of Physics. 51(5), 1019-1032.
• [10] Hwang, J.Y., Doty, H.W. & Kaufman, M.J. (2008). The effects of Mn additions on the microstructure and mechanical properties of Al–Si–Cu casting alloys. Materials Science and Engineering A. 488, 496-504.
• [11] Murty, B.S., Kori, S.A. & Chakraborty, M. (2002). Grain refinement of aluminium and its alloys by heterogeneous nucleation and alloying. International Materials Reviews. 47(1), 3-29.
• [12] Easton, M.A. & StJohn, D.H. (2001) A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles. Acta. Mater. 49, 1867-1878.
• [13] Kashyap, K.T. & Chandrashekar, T. (2001). Effects and mechanisms of grains refinement in aluminium alloys. Bulletin of Materials Science. 24(4), 345-353.
• [14] Spittle, J.A. (2006). Grain refinement in shape casting of aluminium alloys. International Journal of Cast Metals Research. 19(4), 210-222.
• [15] Fras, E., Wiencek, K., Górny, M., Lopez, H., & Olejnik, E. (2013). Equiaxed grain count in aluminum alloy castings: Theoretical background and experimental verification. Metall. Mater. Trans. A. 44(13), 5788-5795.
• [16] Sikora, G. (2015). Influence of Copper on the Primary Structure and Eutectic Transformation in Al-Cu Alloys. Archives of Foundry Engineering. 15(special 4), 113-118. (in Polish).

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.