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2 Archives of Foundry Engineering

2 2023

2 Braszczyńska-Malik K.

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Microstructure and Properties of Experimental Mg-9Al-5RE-1Zn-Mn Magnesium Alloy

100%

Braszczyńska-Malik K.

Archives of Foundry Engineering

2023

tom Vol. 23, iss. 4

169--172

In this paper, an experimental Mg-Al-RE-type magnesium alloy, named AEZ951, is presented. The chemical composition of the investigated alloy was ca. 9 wt% Al, 5 wt% RE (rare earth elements), 0.7 wt% Zn and 3 wt% Mn. The experimental material was gravity cast into a cold steel mould. Microstructure analyses were carried out by light microscopy, along with X-ray phase analysis and scanning electron microscopy with an energy-dispersive X-ray spectrometer (SEM + EDX). Detailed investigations disclosed the presence of and Al10RE2Mn7 intermetallic compounds in the alloy microstructure. The(Mg) solid solution and Al11RE3, primary dendrites of an eutectic was also presented. The hardness, impact strength, tensile strength as well as the+volume fraction of the Al11RE3 phase and yield strength of the alloy were examined in tests at room temperature. The examined experimental Mg-Al-RE-type magnesium alloy exhibited higher mechanical properties than the commercial AZ91 alloy (cast in the same conditions).

Influence of Defects on Deformation Behavior of High-Pressure Die-Casting Magnesium Alloys

100%

Braszczyńska-Malik K.

Archives of Foundry Engineering

2023

tom Vol. 23, iss. 2

10--14

The results of investigations of defects in AME-series magnesium alloys produced by the high-pressure die-casting method are presented. The analyzed magnesium alloys contain about 5 wt% aluminum and 1-5 wt% rare earth elements introduced in the form of mischmetal. The casts were fabricated using a regular type cold-chamber high-pressure die-casting machine with a 3.2 MN locking force. The same surfaces of the casts were analyzed before and after the three-point bending test in order to determine the influence of the gas and shrinkage porosity on the deformation behavior of the alloys. The obtained results revealed that the most dangerous for the cast elements is the shrinkage porosity, especially stretched in the direction perpendicular to the that of the tensile stress action. Additionally, the influence (Mg) solid solution and its interaction on the cracking process was described [alpha]  of deformation twins arise in the dendrites of the primary.