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The influence of age hardening on the microstructure of GA8 magnesium alloy

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Języki publikacji
EN
Abstrakty
EN
Purpose: GA8 magnesium alloy is a general purpose gravity sand casting alloy containing aluminum, zinc and manganese. Typically, it is used in aerospace, automotive or commercial casting applications particularly where there is no high temperature requirement. Particularly for elements of the car interior, car body, chassis and driving gears. The aim of this paper is to present the results of investigations on the microstructure of the GA8 magnesium alloy after precipitation hardening. Design/methodology/approach: The study was conducted on GA8 magnesium alloys in as-cast condition and after heat treatment. The microstructure was characterized by optical microscopy (Olympus GX-70) and a scanning electron microscopy (Hitachi S3400) equipped with an electron dispersive detector EDS (VOYAGER of NORAN INSTRUMENTS). To measure the stereological parameters, an image analysis program "AnalysisPro" was used. Findings: A cast of the GA8 magnesium alloy shows the presence of continuous and discontinuous precipitates of ß (Mg17Al12) phase at the solid-solution grain boundaries, Moreover, the occurrence of Mg2Si and Mn5Al8 phases has been provided. After solution treatment at 415°C the area fraction of continuous and discontinuous β phase precipitates decreased. After ageing at 170°C GA8 alloy is characterized by discontinuous β phase along the solid solution grain boundaries. Area fraction of this phase increased compared to supersaturated state. Research limitations/implications: Future researches should involve investigations of the influence of precipitation hardening parameters on the mechanical properties of GA8 magnesium alloy. Practical implications: The established precipitation hardening parameters can be useful for preparing heat treatment technology of the GA8 magnesium alloy. Originality/value: The relationship between the as cast structure, precipitation hardening parameters and Mg17Al12 phase morphology in GA8 magnesium alloy was specified.
Rocznik
Strony
533--540
Opis fizyczny
Bibliogr. 15 poz., il., wykr.
Twórcy
autor
autor
autor
autor
  • Department of Materials Science, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland, andrzej.kielbus@polsl.pl
Bibliografia
  • [1] H. Friedrich, S. Schumann, Research for a „new age of magnesium” in the automotive industry, Journal of Materials Processing Technology 117 (2001) 276-281.
  • [2] L. Čižek, M. Greger, L. Pawlica, L. A. Dobrzański, T. Tański, Study of selected properties of magnesium alloy AZ91 after heat treatment and forming, Journal of Materials Processing Technology 157-158 (2004) 466-471.
  • [3] E. Aghion, B. Bronfin, D. Eliezer, The role of magnesium industry in protecting the environment, Journal of Materials Processing Technology 117 (2001) 381-385.
  • [4] A. A. Luo, Magnesium current and potential automotive applications, Journal of Materials Processing Technology 54 (2002) 42-47.
  • [5] A. Dahle, Y. Lee, M. Nave, P. Schaffer, D. St. John, Development of the as-cast microstructure in magnesium-aluminium alloys, Journal of Light Metals 1 (2001) 61-72.
  • [6] L. A. Dobrzański, T. Tański, L. Čížek, Influence of Al addition on structure of magnesium casting alloys, Journal of Achievements in Materials and Manufacturing Engineering 17 (2006) 221-224.
  • [7] J. Adamiec, A. Kiełbus, J. Cwajna, Microstructure of the GA8 casting magnesium alloy, Archives of Foundry 18 (2006) 203-208.
  • [8] A. Kiełbus, M. Sozańska, L. Čížek, Microstructural behavior of AZ91D magnesium alloy during heat treatment, Materials Engineering 3 (2004) 364-367.
  • [9] A. Kiełbus, T. Rzychoń, R. Cibis, Microstructure of AM50 die casting magnesium alloy, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 135-138.
  • [10] C. H. Caceres, C. J. Davidson, J. R. Griffiths, C. L. Newton, Effects of solidification rate and ageing on the microstructure and mechanical properties of AZ91 alloy, Materials Science and Engineering A325 (2002) 344-355.
  • [11] P. F. Stratton, E. K. Chamg, Protective atmospheres for the heat treatment of magnesium alloys, TMS Annual Meeting, Symposium: Magnesium Technology 2000.
  • [12] E. Cerri, M. Cabobbo, E. Evangelista, Microstructural evolution during high-temperature exposure in a thixocast magnesium alloy, Materials Science and Engineering A333 (2002) 208-217.
  • [13] M. Zhang, P. M. Kelly, Crystallography of Mg17Al12 precipitates in AZ91D alloy, Scripta Materialia 48 (2003) 647-652.
  • [14] D. Duly, J. P. Simon, Y. Brechet, On the competition between continuous and discontinuous precipitations in binary Mg-Al alloys, Acta Metallurgica et Materialia 43 (1995) 101-106.
  • [15] A. Kiełbus, J. Adamiec, J. Cwajna, J. Paśko, The influence of heat treatment on the microstructure of GA8 magnesium alloy, Journal of Achievements in Materials and Manufacturing Engineering 20 (2007) 131-134.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWAN-0001-0084
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