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The influence of the heat treatment on the microstructure and properties of Mg-Al-Zn based alloys

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Języki publikacji
EN
Abstrakty
EN
Purpose: In the following paper there have been the structure and properties of the MCMgAl12Zn1, MCMgAl9Zn1, MCMgAl6Zn1, MCMgAl3Zn1 magnesium cast alloy as-cast state and after a heat treatment presented. Design/methodology/approach: A casting cycle of alloys has been carried out in an induction crucible furnace using a protective salt bath Flux 12 equipped with two ceramic filters at the melting temperature of 750±10°C, suitable for the manufactured material. The following results concern light and scanning microscopy, X-ray quantitative microanalysis and mechanical properties. Findings: The examined alloys in as-cast state characterize a microstructure of α solid solution constituting the alloy matrix, the β - Mg17Al12 intermetallic phase in the form of plates located mostly at grain boundaries as well as near needle eutectic precipitations Mg17Al12 (α + β). In the structure one can also observe, using the EDS system, big concentrations of silicon, manganese and iron. The ageing process has caused the precipitation of evenly distributed dispersive β secondary phase in the needle form. Practical implications: A good capability of damping vibrations and low inertia connected with a relatively low weight of elements have predominantly contributed to the employment of magnesium alloys for the fast moving elements and in locations where rapid velocity changes occur; some good examples may be car wheels, combustion engine pistons, high-speed machine tools, aircraft equipment elements, etc. Originality/value: The undertaken examinations aim at defining the influence of a chemical composition and precipitation processes on the structure and casting magnesium alloy properties in its as-cast state and after heat treatment with a different content of alloy components.
Rocznik
Strony
48--54
Opis fizyczny
Bibliogr. 20 poz.
Twórcy
autor
autor
autor
  • 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, leszek.dobrzanski@polsl.pl
Bibliografia
  • [1] A.K. Dahle, D.N. StJohn, The Origin of Banded Defects in High Pressure Die Cast Magnesium Alloys, World of Die Casting, Cleveland, 1999.
  • [2] L.A. Dobrzański, T. Tański, L. Cizek, Z. Brytan, Structure and properties of the magnesium casting alloys, Journal of Materials Processing Technology 192-193 (2007) 567-574.
  • [3] L.A. Dobrzański, T. Tański, Influence of aluminium content on behaviour of magnesium cast alloys in bentonite sand mould, Solid State Phenomena 147-149 (2009) 764-769.
  • [4] L.A. Dobrzański, T. Tański, J. Domagała, M. Król, Sz. Malara, A. Klimpel, Structure and properties of the Mg alloys in as-cast state and after heat and laser treatment, Journal of Achievements in Materials and Manufacturing Engineering 31/2 (2008) 123-147.
  • [5] A. Fajkiel, P. Dudek, G. Sęk-Sas, Foundry engineering XXI c. Directions of metallurgy development and Light alloys casting, Publishers Institute of Foundry Engineering, Cracow, 2002.
  • [6] E.F. Horst, B.L. Mordike, Magnesium Technology. Metallurgy, Design Data, Application, Springer-Verlag, Berlin Heidelberg 2006.
  • [7] W. Kasprzak, J.H. Sokołowski, M. Sahoo, L.A. Dobrzański, Thermal characteristic of the AM50 magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 29/1 (2008) 179-182.
  • [8] D. Kuc, E. Hadasik, G. Niewielski, A. Płachta, Structure and plasticity of the AZ31 magnesium Allom after hot deformation, Journal of Achievements in Materials and Manufacturing Engineering 27/1 (2008) 27-30.
  • [9] K. Bryła, J. Dutkiewicz, M. Faryna, T.V. Dobatkina, L.L. Rokhlin, The influence of Nd and Ho addition on the microstructure of Mg-7Al alloy, Archives of Materials Science and Engineering 29/1 (2008) 40-44.
  • [10] Z. Trojanova, Z. Drozd, P. Lukac, A. Chatey, Mechanical properties of a squeeze cast Mg-Al.-Sr alloy, Archives of Materials Science and Engineering 29/2 (2008) 97-104.
  • [11] N.V. Ravi Kumar, J.J. Blandin, C. Desrayaud, F. Montheillet, M. Suery, Grain refinement in AZ91 magnesium alloy during thermomechanical processing, Materials and Engineering A359 (2003) 150-157.
  • [12] K. Iwanaga, H. Tashiro, H. Okamoto, K. Shimizu, Improvement of formability from room temperature to warm temperature in AZ31 magnesium alloy, Journal of Materials Processing Technology 155-156 (2004) 1313-1316.
  • [13] X. Ming-Xu, Z. Hong-Xing, Y. Sen, L. Jian-Guo, Recrystallization of preformed AZ91D magnesium alloys in the semisolid state, Materials and Design 26 (2005) 343-349.
  • [14] N.V. Ravi Kumar, J.J. Blandin, C. Desrayaud, F. Montheillet, M. Suery, Grain refinement in AZ91 magnesium alloy during thermomechanical processing, Materials and Engineering A359 (2003) 150-157.
  • [15] T. Rzychoń, A. Kiełbus, Microstructure of WE43 casting magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 21/1 (2007) 31-34.
  • [16] P. Venkateswarana, S. Ganesh Sundara Ramana, S.D. Pathaka, Y. Miyashitab, Y. Mutoh, Fatigue crack growth behaviour of a die-cast magnesium alloy AZ91D, Materials Letters 58 (2004) 2525-2529.
  • [17] R.M. Wang, A. Eliezer, E. Gutman, Microstructures and dislocations in the stressed AZ91D magnesium alloys, Materials Science and Engineering A344 (2002) 279-287.
  • [18] C. Yan, L. Ye, Y.W. Mai, Effect of constraint on tensile behavior of an AZ91 magnesium alloy, Materials Letters 58 (2004) 3219-3221.
  • [19] M. Yong, A. Clegg, Process optimisation for a squeeze cast magnesium alloy, Journal of Materials Processing Technology 145 (2004) 134-141.
  • [20] L.A. Dobrzański, M. Król, T. Tański, R. Maniara, Effect of cooling rate on the solidification behaviour of magnesium alloys, Archives of Computational Materials Science and Surface Engineering 1/1 (2009) 21-24.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL7-0034-0007
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