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Impact Strength of AE-type Alloys High Pressure Die Castings

Braszczyńska-Malik K., Malik M. A.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 3

5--8

EN

The results of the Charpy impact test of AE-type magnesium alloys produced by the high pressure die casting method are presented. Three alloys with different weight fractions of rare earth elements (RE; e.g. 1, 3 and 5 wt%) and the same mass fraction of aluminium (5 wt%) were prepared. The casts were fabricated using a typical cold chamber high pressure die casting machine with a 3.8 MN locking force. Microstructural analyses were performed by means of a scanning electron microscope (SEM). The impact strength (IS) was determined using a Charpy V hammer with an impact energy equal to 150 J. The microstructure of the experimental alloys consisted of an [alpha]-Mg solid solution and Al11RE3, Al10Ce2Mn7 and Al2RE intermetallic compounds. The obtained results show the significant influence of the rare earth elements to aluminium ratio on the impact strength of the investigated materials. Lower the RE/Al ratio in the chemical composition of the alloy results in a higher impact strength of the material.

2

Mg-Al-RE Magnesium Alloys for High-Pressure Die-Casting

Braszczyńska-Malik K.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 2

49--52

EN

Experimental Mg-Al-RE type magnesium alloys for high-pressure die-casting are presented. Alloys based on the commercial AM50 magnesium alloy with 1, 3 and 5 mass % of rare earth elements were fabricated in a foundry and cast in cold chamber die-casting machines. The obtained experimental casts have good quality surfaces and microstructure consisting of an α(Mg)-phase, Al11RE3, Al10RE2Mn7 intermetallic compound and small amount of α+γ eutectic and Al2RE phases.

3

Microstructural Characterization of the As-cast AZ91 Magnesium Alloy with Rare Earth Elements

Grzybowska A., Braszczyńska-Malik K.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 2s

23--26

EN

Microstructural analysis of as-cast Mg-9Al-0.9Zn-xRE (x = 0, 1, 2, 3, 5 wt.%) magnesium alloys is presented. Light microscopy (LM) and scanning electron microscopy (SEM+EDX) were used to characterized the obtained material. The results revealed that the as-cast AZ91 alloy consists of α – Mg matrix, binary eutectic α + γ (where γ is Mg17Al12). While rare earth elements were introduced to the Mg-Al-Zn alloy new Al11RE3 phase was formed. Additionally, in the experimental alloys instead of Al-Mn phase, ternary Al-Mn-RE compound was observed. What is more, the influence of RE addition on the area fraction of eutectic and needle-like phase was analysed. With increasing addition of RE, the amount of γ phase decreased, but the amount of Al11RE3 phase increased.

4

Effect of ECAP process on grain size of commercial AZ91 alloy

Braszczyńska-Malik K.

Inżynieria Materiałowa

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2004

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R. XXV, nr 3

332-334

EN

Examinations of the microstructure development during equal-channel angular pressing (ECAP) of commercial AZ91 alloy are presented. The initial grain size of the investigated alloy was about ž200 m. Samples were deformed at different temperatures via route Bc through the die characterized by an inner contact angle phi equal 90°. Following the ECAP process the microstructures were homogeneous and exhibited drastic decrease of grain size to 10 žm.

PL

Przedstawiono badania zmian mikrostruktury komercyjnego stopu AZ91 podczas procesu ECAP (equal-channel angular pressing). Początkowa wielkość ziarna badanego stopu wynosiła około 200 žm (rys. 4a). Próbki były odkształcane w różnych temperaturach z rotacją Bc poprzez formę charakteryzującą się kątem phi równym 90° (rys.1). Zastosowanie procesu ECAP pozwoliło na uzyskanie jednorodnej mikrostruktury oraz spowodowało zmniejszenie wielkości ziarna do 10 žm (rys. 4b, c i rys. 5).