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Structure and properties of alloys of the Mg-Al-Zn system

Wybrane pełne teksty z tego czasopisma
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Purpose: In the following paper there have been the structure and complex of mechanical properties of magnesium alloys presented which requires very often knowledge of elastic-plastic properties at elevated temperatures. These properties are connected with microstructure that is influenced by metallurgical and technological factors and conditions of exploitation. The influence of used method ECAP for superplasticity will be investigated. Design/methodology/approach: The tensile test in dependence on temperature of magnesium alloys was based on investigation of mechanical properties. The following results concern light and scanning microscopy for metallographic and fracture analyses of alloys after testing were used. Findings: Objective of this work consisted in determination of changes of elastic-plastic properties of magnesium alloy AZ91 as cast state and after heat treatment in dependence on temperature, including investigation of fracture characteristics. It was confirmed that during heating used alloy as cast state at chosen temperatures there occurs partial dissolution of minority phases. Homogenisation of microstructure is, however, accompanied by simultaneous forming of inter-granular non-integrities, which is unfavourable from the viewpoint of strength and plastic properties, especially at higher temperatures. Failure occurs practically at all temperatures basically by inter-crystalline splitting along the boundaries of original dendrites. At temperature testing near melting point of alloy the interdendrite areas melting were observed. After application ECAP the effect of superplasticity (200-400%) was occurred. Practical implications: The results may be utilized for a relation between plastic and strength properties of the investigated material in process of manufacturing and design of these materials. Originality/value: Complex evaluation of properties magnesium alloys at higher temperatures namely for explanation of fracture mechanism near the melting point. The possibility of supperplasticity effect of Mg-Al alloys was not presented yet.
Rocznik
Strony
179--187
Opis fizyczny
Bibliogr. 19 poz., rys., tabl.
Twórcy
autor
autor
autor
autor
autor
autor
  • VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic, lubomir.cizek@vsb.cz
Bibliografia
  • [1] M. Avedesian, H. Baker, ASM Specialty Handbook- Magnesium and Magnesium Alloys, ASM International, USA (1999) 3-84.
  • [2] L. Cízek, M. Greger, L. Pavlica, 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] L. Cízek, M. Greger, L. A. Dobrzański, I. Juricka, R. Kocich, L. Pwlica, T. Tański, Mechanical properties of magnesium alloy AZ91 at elevated temperatures, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 203-206.
  • [4] L. Cízek, R. Korený, I. Juricka, J. Maisner, M. Greger, S. Lasek, P. Bet’áková, A. Hernas, Structure and Properties of the Selected magnesium Alloys, Proceedings of the 10th International Scientific Conference “Achievements in Mechanical and Materials Engineering” AMME’2001, Gliwice-Zakopane, 2001, 75-78.
  • [5] K. A. Dahle, Z. C. Lee, M. D. Nave, P. L. Schaffer, D. H. Johnson, Development of the as-cast microstructure in magnesium-aluminium alloys, Journal of Light Metals 1 (2001) 61-73.
  • [6] J. R. Davis, Metals Handbook, Desk Edition, Second Edition, ASM International, The Materials Information Society, USA, 1998.
  • [7] L. A. Dobrzański, T. Tański, L. Cízek, Influence of heat treatment on structure and mechanical property of the casting magnesium alloys, Proceedings of the 11th International Scientific Conference “Contemporary Achievements in Mechanics, Manufacturing and Materials Science” CAM3S’2005, Gliwice-Zakopane, 2005, (CD-ROM).
  • [8] L. A. Dobrzański, T. Tański, L. Cízek, Influence of Al addition on microstructure of die casting magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 19/2 (2006) 49-55.
  • [9] 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.
  • [10] H. Friedrich, S. Schumann, Research for a ‘New age of magnesium in the automotive industry’, Journal of Materials Processing Technology 117 (2001) 276-281.
  • [11] M. Greger, L. Cízek, M. Widomska, Structural characteristics Magnesium Alloys along of the Equal Channel Angular Pressing, Proceedings of the International Conference “Advanced Metallic Materials and their Joining”, Bratislava, 2004, 55-58.
  • [12] M. Greger, R. Kocich, L. Cízek, L.A. Dobrzański, I. Juricka, Possibilities of mechanical properties and microstructure improvement of magnesium alloys, Archives of Materials Science and Engineering 28/2 (2007) 83-90.
  • [13] A. Kiełbus, Structure and mechanical properties of casting MSR-B magnesium alloy, Journal of Achievements in Materials and Manufacturing Engineering 18 (2006) 131-134.
  • [14] 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.
  • [15] 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.
  • [16] B.L. Mordike, T. Ebert, Magnesium. Properties-applications-potential, Journal of Materials Processing Technology 117 (2001) 37-45.
  • [17] P. Palcek, P. Lukác, M. Chalupová, Z. Trojanová, Influence of temperature on fracture characteristics selected magnesium alloys, Materials Engineering 3 (2005) 7-10 (in Slovak).
  • [18] L. Ptácek, Magnesium alloys-present state of development and exploitation, Proceedings of the Conference METAL 2001, Ostrava - Hradec n. Moravicí, 2001, 1-12 (in Czech).
  • [19] T. Tański, L. A. Dobrzański, L. Cízek, Influence of heat treatment on structure and properties of the cast magnesium alloys, Journal of Advanced Materials Research 15-17 (2007) 491-496.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BOS2-0020-0003
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