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Microscopic Analysis of Layers Containing Mg2Si and Mg17Al12 Phases Fabricated on AZ91 Through Thermochemical Treatment

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Języki publikacji
EN
Abstrakty
EN
The thermochemical treatment applied to improve the surface properties of AZ91 consisted in heating the material in contact with AlSi10Mg powder at 445 oC for 30 min. During heat treatment process the powder was held under pressure to facilitate the diffusion of the alloying elements to the substrate and, accordingly, the formation of a modified layer. Two pressures, 1 MPa and 5 MPa, were tested. The resultant layers, containing hard Mg2Si and Mg17Al12 phases, were examined using an optical microscope and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer (EDS). The experimental data show that the layer microstructure was dependent on the pressure applied. A thicker, three-zone layer (about 200 μm) was obtained at 1 MPa. At the top, there were Mg2Si phase particles distributed over the Mg17Al12 intermetallic phase matrix. The next zone was a eutectic (Mg17Al12 and a solid solution of Al in Mg) with Mg2Si phase particles embedded in it. Finally, the area closest to the AZ91 substrate was a eutectic not including the Mg2Si phase particles. By contrast, the layer produced at a pressure of 5 MPa had lower thickness of approx. 150 μm and a two-zone structure. Mg2Si phase particles were present in both zones. In the upper zone, Mg2Si phase particles were regularly distributed over the Mg17Al12 intermetallic phase matrix. The lower zone, adjacent to the AZ91, was characterized by a higher volume fraction of Mg2Si phase particles distributed over the matrix composed mainly of Mg17Al12. The alloyed layers enriched with Al and Si had much higher hardness than the AZ91 substrate.
Rocznik
Tom
Strony
119--124
Opis fizyczny
Bibliogr. 24 poz., rys., tab.
Twórcy
autor
  • Kielce University of Technology, Kielce, Poland
autor
  • Kielce University of Technology, Kielce, Poland
Bibliografia
  • [1] Gray, J.E. & Luan, B. (2002). Protective coatings on magnesium and its alloys – a critical review. Journal of Alloys and Compounds. 336, 88-113.
  • [2] Galun, R., Weisheit, A. & Mordike, B.L. (1998). Improving the surface properties of magnesium by laser alloying. Corrosion Reviews. 16, 53-74.
  • [3] Ignat, S., Sallamand, P., Grevey, D. & Lambertin, M. (2004). Magnesium alloys laser (Nd:YAG) cladding and alloying with side injection of aluminium powder. Applied Surface Science. 225, 124-134.
  • [4] Paital, S.R., Bhattacharya, A., Moncayo, M., Ho, Y.H, Mahdak, K., Nag, S., Banerjee, R. & Dahotre, N.B. (2012). Improved corrosion and wear resistance of Mg alloys via laser surface modification of Al on AZ31B. Surface and Coatings Technology. 206, 2308-2315.
  • [5] Yang, Y. & Wu, H. (2009). Improving the wear resistance of AZ91D magnesium alloys by laser cladding with Al-Si powders. Materials Letters. 63, 19-21.
  • [6] Carcel, B., Sampedro, J., Ruescas, A. & Toneu, X. (2011). Corrosion and wear resistance improvement of magnesium alloys by laser cladding with Al-Si. Physics Procedia. 12, 353-363.
  • [7] Singh, A. & Harimkar, S.P. (2012) Laser surface engineering of magnesium alloys: a review. JOM. 64(6), 716-733.
  • [8] Mola, R., Dziadoń, A. & Jagielska-Wiaderek, K. (2016). Properties of Mg laser alloyed with Al or AlSi20. Surface Engineering. 32(12), 908-915.
  • [9] Shigematsu, M., Nakamura, M., Saitou, K. & Shimojima, K. (2000). Surface treatment of AZ91D magnesium alloy by aluminum diffusion coating. Journal of Materials Science Letters. 19, 473-475.
  • [10] Zhu, L. & Song, G. (2006). Improved corrosion resistance of AZ91D magnesium alloy by an aluminum-alloyed coating. Surface and Coatings Technology. 200, 2834-2840.
  • [11] Liu, F., Li, X., Liang, W., Zhao, X. & Zhang, Y. (2009). Effect of temperature on microstructures and properties of aluminized coating on pure magnesium. Journal of Alloys and Compounds. 478, 579-585.
  • [12] Mola, R. (2015). The properties of Mg protected by Al- and Al/Zn-enriched layers containing intermetallic phases. Journal of Materials Research. 30(23), 3682-3691.
  • [13] Zhang, M.X. & Kelly, P.M. (2002). Surface alloying of AZ91 alloy by diffusion coating. Journal of Materials Research. 17(10), 2477-2479.
  • [14] Ma, Y., Xu, K., Wen, W., He, X. & Liu, P. (2005). The effect of solid diffusion surface alloying on properties of ZM5 magnesium alloy. Surface and Coatings Technology. 190, 165-170.
  • [15] Hirmke, J., Zhang, M.X. & StJohn, D.H. (2011). Surface alloying of AZ91E alloy by Al-Zn packed powder diffusion coating. Surface and Coatings Technology. 206, 425-433.
  • [16] Mola, R. (2014).The properties of Al/Zn-enriched surface layer on Mg. Archives of Foundry Engineering. 14(3), 45-48.
  • [17] Mola, R. (2016). The microstructure of alloyed layers formed on Mg by the powder-pack method. METAL 2016: 25th
  • Anniversary International Conference on Metallurgy and Materials, 1492-1497.
  • [18] Chen, Y., Liu, T.M. Lu, L.W. & Wang, Z.C. (2012). Thermally diffused antimony and zinc coatings on magnesium alloys AZ31. Surface Engineering. 28(5), 382-386.
  • [19] Wang, H., Yu, B., Wang, W., Ren, G., Liang, W. & Zhang, J. (2014). Improved corrosion resistance of AZ91D magnesium alloy by zinc-yttrium coating. Journal of Alloys and Compounds. 582, 457-460.
  • [20] Mola, R., Stępień, E & Cieślik, M. (2017). Characterization of the surface layer of Mg enriched with Al and Si by thermochemical treatment. Archives of Foundry Engineering. 17(4), 195-199.
  • [21] Okamoto, H. (1998). Al-Mg (Aluminium-Magnesium). Journal of Phase Equilibria 19(6), 598
  • [22] Phase Equilibria, Crystallographic and Thermodynamic Data of Binary Alloys, Landolt-Börstein /New series IV/ Springer-Verlag Berlin 1998.
  • [23] Raghavan, V. (2007). Al-Mg-Si (Aluminium-Magnesium-Silicon). Journal of Phase Equilibria and Diffusion, 28(2), 189-191.
  • [24] Westbrook, J.H. & Fleischer, R.L. (2000). Structural applications of intermetallic compounds, John Willey& Sons.
Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2f4c6c4d-5dde-40fb-af2c-993a2e37f96c
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