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Partially Melted Zone in Mg-Al Type Alloy After Gas-tungsten Arc Welding

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

Archives of Foundry Engineering

2013

Vol. 13, iss. 2 spec.

18--21

The gas-tungsten arc (GTA) welding behaviors of the commercial AZ91 magnesium alloy were examined in terms of microstructure characteristics. This study focused on the effects of the GTAW process parameters (like welding current, welding speed and method of additional cooling of the welded samples) on the size of the fusion zone (FZ) and partially melted zone (PMZ). The PMZ morphology of the eutectic regions changed from less to more divorced in the direction from the FZ to the base metal. The largest PMZ was obtained at a low welding speed (3.33 mm/s) and without additional water cooling of the samples.

Analysis of heavy alloying elements segregation in gravity cast experimental Mg-Al-Zn-RE alloy

Żydek A., Polis-Olejniczak A., Malik M. A., Kamieniak J., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1

217-220

Microstructure of experimental AZ91 alloy with an addition of rare earth elements (RE) at a level of 4 wt.% was examined by means of light microscopy. The investigated AZ91 + 4 wt.% RE alloy was fabricated by adding cerium rich mish metal to molten commercial AZ91 alloy. In the microstructure of the resulting alloy, besides [alpha] solid solution, [alpha] + [gamma] eutectic and discontinuous precipitates of [gamma] phase, also the Al_11RE_3 phase with needle-like morphology and the polygonal Al_10RE_2Mn_7 phase were revealed. No segregation of rare earth elements was found in the investigated gravity cast alloy, which was confirmed by statistical analysis of cerium concentrations in selected parts of the cast. Similar results were obtained for manganese. Ce and Mn concentrations were determined by a spectrophotometric method.