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

• Autorzy: Cizek L. , Greger M. , Dobrzański L. A. , Juricka I. , Kocich R. , Pawlica L. , Tański T.
• 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.

Słowa kluczowe

EN

mechanical properties; magnesium alloy; fracture characteristics; tensile test

PL

właściwości mechaniczne; stop magnezowy; charakterystyka pękania; test na rozciąganie

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 32, nr 2
• Strony: 179--187
• Opis fizyczny: Bibliogr. 19 poz., rys., tabl.

Twórcy

autor

Cizek L.

autor

Greger M.

autor

Dobrzański L. A.

autor

Juricka I.

autor

Kocich R.

autor

Pawlica L.

autor

Tański T.

• VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic,

Bibliografia

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