Heat treatment impact on the structure of die-cast magnesium alloys

• Autorzy: Dobrzański, L. A. , Tański, T. , Čižek, L.
• Konferencja: 12th International Scientific Conference CAM3S'2006, 27-30th November 2006, Gliwice-Zakopane
• Języki publikacji: EN

Abstrakty

EN

Purpose: In the following paper there have been the structure and properties of the MCMgAl6Zn1 magnesium cast alloy as-cast state and after heat treatment presented. Design/methodology/approach: A casting cycle of alloys has been carried out in an introduction crucible furnace using a protective salt bath Flux 12 equipped with two ceramic filters at the melting temperature of 750 plmin 10 degrees centigrade, suitable for the manufactured material. The following results concern light and scanning microscopy, X-ray qualitative and quantitative microanalysis. Findings: The results of the EDS chemical composition analysis confirm the presence of magnesium, aluminium, manganese, and zinc, constituting the structure of alpha solid solution with Mg17Al12 placed mainly on the grain order in the form of plates, also the phase AlMnFe with irregular shape, occurred often in the shape of blocks or needles and the Laves phase Mg2Si. Research limitations/implications: According to the alloys characteristics, the applied cooling rate and alloy additions seems to be good compromise for mechanical properties and microstructures, nevertheless further tests should be carried out in order to examine different cooling rates and parameters of solution treatment process and aging process. Practical implications: A desire to create as light vehicle constructions as possible and connected with it low fuel consumption have made it possible to make use of magnesium alloys as a constructional material in automotive industry. 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.

Słowa kluczowe

PL

obróbka cieplna; metalografia; stopy magnezu; struktura

EN

heat treatment; metallography; magnesium alloys; structure

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 20, nr 1-2
• Strony: 431-434
• Opis fizyczny: Bibligr. 15 poz., fot., tab.

Twórcy

autor

Dobrzański, L. A.

autor

Tański, T.

autor

Čižek, L.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18 a, 44-100 Gliwice, Poland,

Bibliografia

• [1] K.U. Kainer, Sb. Int. Congress Magnesium Alloys and their Application, Mnichov, 2000, 534-608.
• [2] J.F.Grandfield, J.A.Taylor, Tensile cohereny in semi-solid AZ91, Held during the TMS Annual Meting in Seattle, Washington, USA, 2002.
• [3] H. Baker: ASM Specialty Handbook. Magnesium and Magnesium Alloys, ed. Avedesian, ASM International, The Materials Information Society, USA 1999, 3-84.
• [4] A.K. Dahle, D.N. StJohn, "The Origin of Banded Defects in High Pressure Die Cast Magnesium Alloys", World of Die Casting, Cleveland T99-062.
• [5] J.M. Tartaglia, J.C. Grebetz, “Observations of Intermetallic Particle and Inclusion Distributions in Magnesium Alloys”, The Minerals, Metals&Materials Society, 2000.
• [6] B.L. Mordike, T. Ebert: Magnesium. Properties-applications-potential, Materials Science and Engineering nr A302, Journal of Materials Processing Technology, 117 (2001) 37-45.
• [7] 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.
• [8] A. Maltaisa, D. Dubé, M. Fiseta, G. Larochea, S. Turgeon: Improvements in the metallography of as-cast AZ91 alloy, Materials Characterization, 52 (2004) 103-119.
• [9] L.A. Dobrzański, T. Tański, L. Čižek, Influence of modification with chemical elements on structure of magnesium casting alloys, 13th Scientific International Conferences “Achievements in Mechanical and Materials Engineering AMME’, 2005” Gliwice-Wisła 2005, 199-202.
• [10] L.A. Dobrzański, T. Tański, L. Čižek, Influence of Al addition on structure of magnesium casting alloys, Journal of Achievements in Mechanical and Materials Engineering, 17 (2006) 221-224.
• [11] R.M. Wang, A. Eliezer, E. Gutman, Microstructures and dislocations in the stressed AZ91D magnesium alloys, Materials Science and Engineering, A344 (2002) 279-287.'
• [12] K. Ishikawaa, H. Watanabea, T. Mukaib, High strain rate deformation behavior of an AZ91 magnesium alloy at elevated temperatures, Materials Letters, 59 (2005) 1511-1515
• [13] 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.
• [14] H. Friedrich, S. Schumann, Research for a "new age of magnesium" in the automotive industry, Journal of Materials Processing Technology, 117 (2001) 276-281.
• [15] A. Fajkiel, P. Dudek: Foundry engineering – Science and Practice, Publishers Institute of Foundry engineering, Cracow, 2004, 18-21.