Morphology prediction of intermetallics formed in 4xxx type of aluminium alloy

• Autorzy: Mrówka-Nowotnik G. , Sieniawski J. , Wierzbińska M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: It is intention of this paper to present results of studies of AlSi5Cu2Mg cast alloy in T6 condition with emphasis on composition of intermetallic phases. It was revealed that the microstructure of the alloy is characterized by three different intermatallic phases. Their morphology depends on the base metal and crystallization parameters applied. Design/methodology/approach: Microstructural examination was conducted for the specimens using optical metallography, scanning (SEM) and transmission (TEM) electron microscopy as a complement to light optical investigation. Differential scanning calorymetry was utilized to assist in intermetallics identification. Phase identification was done by electron diffraction spectrometry microanalyser EDS using X-ray mapping technique on representative area for the structure of the material and a quantitative analysis was conducted for the large particles, which are large enough in size for individual analysis. Findings: Three types of intermetallic α -AlFeMnSi phase precipitates vary on shapes and chemical compositions were determined. Their morphology was mainly influenced by the parameters of crystallization process. The intermetallics can precipitate in form of needle or ''Chinese script''. The shape of phases determined can also be modified by adjusted modifying heat treatment process of the alloy. Research limitations/implications: It is recommended to perform further analysis of the alloy by using more sophisticated technique for microsctructure observation - TEM in order to clarify a formation model and provide characteristic of the refined phases. These dispersed, smaller in size intermetallics compared to these characterized in this paper, have a considerable impact on the mechanical properties of the alloy. Practical implications: It is important to develop a. predictive understanding of intermetallics formation through crystallization and heat treatment process since they play the most significant role in development of final properties of a material designed for utilitarian application. Originality/value: This work is a contribution to the understanding of precipitation hardening behavior of the intermetallic phases and clarifying their formation mechanism by determination of their chemistry and occurring sequence in the microstructure during crystallization and heat treatment processes.

Słowa kluczowe

EN

metallic materials; instumented indentation test for hardness; instumented indentation test for materials parameters

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 31, nr 2
• Strony: 262--268
• Opis fizyczny: Bibliogr. 22 poz., wykr.

Twórcy

autor

Mrówka-Nowotnik G.

autor

Sieniawski J.

autor

Wierzbińska M.

• Department of Materials Science, University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland,

Bibliografia

• [1] C. Kammer, Aluminium Handbook. vol.1, Fundamentals and Materials Aluminium-Verlag, Marketing and Kommunikation GmbH, Düsseldorf, 1999.
• [2] G. Gustafsson, T. Thorvaldsson, G. L. Dunlop, The influence of Fe and Cr on the microstructure of cast Al-Mg-Si alloys, Metallurgical and Materials Transactions A17 (1986) 45-52.
• [3] F. King, Aluminium and its alloys, John Willey and Sons, New York-Chichester-Brisbane-Toronto, 1987.
• [4] L. F. Mondolfo, Aluminium Alloys: Structure and Properties, Butterworths, London-Boston, 1976.
• [5] Y. L. Liu, S. B. Kang, H. W. Kim, The complex microstructures in as-cast Al-Mg-Si alloy, Materials Letters 41 (1999) 267-272.
• [6] J. W. Martin, Preciptation Hardening, Pergamon Press, Oxford,1968.
• [7] I. J. Polmear, Light alloys. Metallurgy of the light metals, Arnold, London-New York-Sydney-Auckland, 1995.
• [8] L. A. Dobrzański, R. Maniara, M. Krupiński, J. H Sokolowski, Microstructure and mechanical properties of AlSi9CuX alloys, Journal of Achievements in Materials and Manufacturing Engineering 24/2 (2007) 51-54.
• [9] M. Kciuk, S. Tkaczyk, Structure, mechanical properties and corrosion resistance of AlMg5 and AlMg1Si1 alloys, Journal of Achievements in Materials and Manufacturing Engineering 21/1 (2007) 39-42.
• [10] M. Takeda, A. Komatsu, M. Ohta, T. Shirai, T. Endo, The influence of Mn on precipitation behavior in Al-Cu, Scripta Materialia 39/9 (1998) 1295-1300.
• [11] M. Warmuzek, G. Mrówka, J. Sieniawski, Influence of the heat treatment on the precipitation of the intermetallic phases in comercial AlMn1FeSi alloy, Journal of Materials Processing Technology 157-158 (2004) 624-632.
• [12] S. Zajac, B. Bengtsson, C. Jönsson, Influence of cooling after homogenization and reheating to extrusion on extrudability and final properties of AA6063 and AA6082 alloys, Materials Science Forum 396-402 (2002) 399-404.
• [13] G. Mrówka-Nowotnik, J. Sieniawski, Proceedings of the International Conference „Achievements in Mechanical and Materials Engineering”, Gliwice-Wisła, 2005, 447-450.
• [14] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Intermetallic phase particles in 6082 aluminium alloy, Archives of Materials Science and Engineering 28/2 (2007) 69-76.
• [15] G. Mrówka-Nowotnik, J. Sieniawski, M. Wierzbińska, Analysis of intermetallic particles in AlSi1MgMn aluminium alloys, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 155-158.
• [16] M. Wierzbińska, G. Mrówka-Nowotnik, Identification of phase composition of AlSi5Cu2Mg aluminium alloy in aluminium alloy Journal of Materials Processing Technology 102 (2000) 234-240.
• [17] L. A. Dobrzański, R. Maniara, J. H. Sokolowski, The effect of cast Al-Si-Cu alloy solidification rate on alloy thermal T6 condition, Archives of Materials Science and Engineering 30/2 (2008) 85-88.
• [18] R. A. Siddiqui, H. A. Abdullah, K. R. Al.-Belushi, Influence of aging parameters on the mechanical properties of 6063 characteristics, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 217-220.
• [19] G. Sha, K. O'Reilly, B. Cantor, J. Worth, R. Hamerton, Growth related phase selection in a 6xxx series wrought Al alloy, Materials Science and Engineering A 304-306 (2001) 612-616.
• [20] A. K. Gupta, D. J. Lloyd, S. A. Court, Precipitation hardening in Al-Mg-Si alloys with and without excess Si, Materials Science and Engineering A 316 (2001) 11-17.
• [21] M. Warmuzek, K. Rabczak, J. Sieniawski, The course of the peritectic transformation in the Al-rich Al-Fe-Mn-Si alloys, Journal of Materials Processing Technology 162-163 (2005) 422-428.
• [22] M. Warmuzek, J. Sieniawski, K. Wicher, G. Mrówka-Nowotnik, The study of distribution of the transition metals and Si during primary precipitation of the intermetallic phases in Al-Mn-Si alloys, Journal of Materials Processing Technology 175/1-3 (2006) 421-426.