Hüseyin Zengin, Soner Ari, Muhammet Emre Turan, Achim Walter Hassel,
"Evolution of Microstructure, Mechanical Properties, and Corrosion Resistance of Mg?2.2Gd?2.2Zn?0.2Ca (wt%) Alloy by Extrusion at Various Temperatures"
, in Materials, Vol. 16, 2023
Original Titel:
Evolution of Microstructure, Mechanical Properties, and Corrosion Resistance of Mg?2.2Gd?2.2Zn?0.2Ca (wt%) Alloy by Extrusion at Various Temperatures
Sprache des Titels:
Englisch
Original Kurzfassung:
The current investigation involved casting the Mg?2.2Gd?2.2Zn?0.2Ca (wt%) alloy (GZX220) through permanent mold casting, followed by homogenization at 400 °C for 24 h and extrusion at 250 °C, 300 °C, 350 °C, and 400 °C. Microstructure investigations revealed that ?-Mg, Mg?Gd, and Mg?Gd?Zn intermetallic phases were present in the as-cast alloy. Following the homogenization treatment, a majority of these intermetallic particles underwent partial dissolution into the matrix phase. ?-Mg grains exhibited a considerable refinement by extrusion due to dynamic recrystallization (DRX). At low extrusion temperatures, higher basal texture intensities were observed. The mechanical properties were remarkably enhanced after the extrusion process. However, a consistent decline in strength was observed with the rise in extrusion temperature. The corrosion performance of the as-cast GZX220 alloy was reduced by homogenization because of the lack of corrosion barrier effect of secondary phases. A significant enhancement of corrosion resistance was achieved by the extrusion process.
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