Wyniki wyszukiwania - BazTech

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Identyfikacja wydzieleń występujących w strukturze blach cienkich ze stopu magnezu AM50

Skupień P., Rozmus R.

Prace Instytutu Metalurgii Żelaza

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2013

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T. 65, nr 4

18--22

PL

W pracy przedstawiono wyniki badań obejmujące identyfikację wydzieleń znajdujących się w strukturze blach cienkich ze stopu magnezu AM50 walcowanych na gorąco. Badania przeprowadzono przy użyciu wysokorozdzielczego elektronowego mikroskopu skaningowego Inspect F oraz transmisyjnego Titan 80-300. W strukturze badanego stopu zidentyfikowano trzy typy wydzieleń różniących się miedzy sobą składem chemicznym i morfologią.

EN

This paper presents the results of tests including the identification of precipitations in the structure of hot rolled AM50 magnesium alloy sheets. The tests were carried out using high-resolution scanning electron microscope Inspect F and transmission electron microscope Titan 80-300. Three types of precipitations were identified within the structure of the tested alloy, which differed in their chemical compositions and morphologies.

2

Odporność korozyjna kompozytu na osnowie stopu magnezu AM50 umacnianego cząstkami SiC

Kamieniak K., Malik M. A.

Ochrona przed Korozją

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2012

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nr 11

495-498

PL

W pracy scharakteryzowano mikrostrukturę kompozytu na osnowie stopu magnezu AM50 zbrojonego cząstkami SiC. Kompozyt zawierający 10% mas. SiC otrzymano na drodze odlewania grawitacyjnego. Porównano odporność na korozję wytworzonego kompozytu z odpornością korozyjną materiału osnowy w środowisku 0,5 mol dm3 NaCl nasyconego Mg(OH)2. Na podstawie pomiarów elektrochemicznych wykazano, że kompozyt AM50/10%SiC ulega korozji z szybkością ok. 100-krotnie większą niż stop AM50. Pomiary szybkości wydzielania wodoru potwierdziły wyniki badań elektrochemicznych.

EN

In present work, the microstructure of the composite based on AM50 magnesium alloy matrix reinforced with SiC particles was characterized. The composite containing 10 wt. % of SiC was fabricated by means of gravity casting. The corrosion resistance of the obtained composite was compared with the corrosion resistance of the matrix alloy in a solution of 0.5 mol dm3 NaCl saturated with Mg(OH)2. The results of performed electrochemical measurements revealed that the corrosion rate of the investigated composite was about two orders of magnitude higher than the corrosion rate of the matrix alloy. This conclusion was confirmed by hydrogen evolution rate measurements.

3

Microstructural analysis of AM50/Mg2Si cast magnesium composites

Malik M. A., Majchrzak K., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 4

109-112

EN

AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method. The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of \alfa-phase (a solid solution of aluminium in magnesium), Mg17Al12 (\gamma-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.

4

Microstructure of AM50 die casting magnesium alloy

Kiełbus A., Rzychoń T., Cibis R.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

135--138

EN

Purpose: AM50 magnesium alloy allows high-energy absorption and elongation at high strength and has good castability. It contains aluminum and manganese. Typically, it is used in automotive industry for steering wheels, dashboards and seat frames. The aim of this paper is to present the results of investigations on the microstructure of the AM50 magnesium alloy in an ingot condition and after hot chamber die casting. Design/methodology/approach: Die casting was carried out on 280 tone locking force hot-chamber die casting machine. For the microstructure observation, a Olympus GX+70 metallographic microscope and a HITACHI S-3400N scanning electron microscope with a Thermo Noran EDS spectrometer equipped with SYSTEM SIX were used. Findings: Based on the investigation carried out it was found that the AM50 magnesium alloy in as ingot condition is characterized by a solid solution structure a with partially divorced eutectic (a + Mg17Al12) and precipitates of Mn5Al8 phase. After hot chamber die casting is characterized by a solid solution structure a with fully divorced eutectic a + Mg17Al12. Moreover, the occurrence of Mn5Al8 phase and some shrinkage porosity has been proved. Research limitations/implications: Future researches should contain investigations of the influence of the die casting process parameters on the microstructure and mechanical properties of AM50 magnesium. Practical implications: AM50 magnesium alloy can be cast with cold- and hot-chamber die casting machine. Results of investigation may be useful for preparing die casting technology of this alloy. Originality/value: The results of the researches make up a basis for the investigations of new magnesium alloys for hot chamber die casting with addition of RE elements designed to exploitation in temperature to 175°C.