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Structure of MMCs with SiC Particles after Gas-tungsten Arc Welding

Przełożyńska E., Braszczyńska-Malik K. N., Mróz M.

Archives of Foundry Engineering

2015

Vol. 15, iss. 4

65--68

The gas-tungsten arc (GTA) welding behaviors of a magnesium matrix composite reinforced with SiC particles were examined in terms of microstructure characteristics and process efficiencies. This study focused on the effects of the GTAW process parameters (like welding current in the range of 100/200 A) on the size of the fusion zone (FZ). The analyses revealed the strong influence of the GTA welding process on the width and depth of the fusion zone and also on the refinement of the microstructure in the fusion zone. Additionally, the results of dendrite arm size (DAS) measurements were presented.

Possibilities of Fabricating Mg-Al-RE Cast Magnesium Matrix Composites Reinforced with Ti Particles

Przełożyńska E., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2015

Vol. 15, iss. 3 spec.

73--76

The results of microstructure investigations of an experimental magnesium matrix composite reinforced with Ti particles are presented. The experimental Mg-5Al-5RE magnesium alloy was used as the matrix alloy. The examined composite was reinforced with 30 wt% titanium spherical particles. The investigated material was obtained by the stir-casting method. The microstructure of the fabricated composite was characterized by a uniform arrangement of the Ti particles within the magnesium matrix. No new phases (created due to reaction between the matrix and Ti particles) were revealed by XRD techniques.

Evolution of Mg-5Al-0.4Mn microstructure after rare earth elements addition

Żydek A., Kamieniak J., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2

157-160

Mg-5Al-0.4Mn-xRE (x = 0, 1, 2, 3 wt.%) magnesium alloys were prepared successfully by casting method. The microstructure was investigated by light microscopy. The influence of rare earth (RE) elements on the area fraction of eutectic was analysed. The obtained results revealed that the as-cast Mg-5Al-0.4Mn alloy consist of \alfa - Mg matrix and eutectic \alfa + \gamma (where \gamma is Mg17Al12). However, while rare earth elements were added to the Mg-Al type alloy, Al11RE3 precipitates were formed. The amount of the Al11RE3 precipitates increased with increasing addition of RE, but the amount of \gamma - Mg17Al12 decreased.

The effect of rare earth elements on the microstructure of as-cast AM50 alloy

Żydek A., Kamieniak J., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1 spec.

147--150

As-cast Mg-5Al-0.4Mn-xRE (x = 0, 1, 2 wt.%) magnesium alloys were prepared successfully and influence of rare earth (RE) elements on the microstructure has been investigated by light microscopy and X-ray diffraction (XRD). The results revealed that the as-cast Mg-5Al-0.4Mn alloy consist of α - Mg matrix and eutectic α + γ (where γ is Mg17Al12). With the addition of rare earth elements Al11RE3 precipitates were formed. The amount of the Al11RE3 precipitates increased with increasing addition of RE, but the amount of γ - Mg17Al12 decreased. Additionally, in alloys with rare earth elements no aluminium-manganese precipitates were observed, instead of that ternary intermetallic compound Al10RE2Mn7 was formed.