Grain Refinement and Enhancement of Mechanical Properties of Hot Extruded Rare-Earth Containing Magnesium Alloy

Pourbahari, Bita; Mirzadeh, Hamed; Emamy, Massoud

doi:10.22059/JUFGNSM.2017.02.08

Grain Refinement and Enhancement of Mechanical Properties of Hot Extruded Rare-Earth Containing Magnesium Alloy

Document Type : Research Paper

Authors

Bita Pourbahari ¹

Hamed Mirzadeh ²

Massoud Emamy ¹

¹ School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

² School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran

10.22059/JUFGNSM.2017.02.08

Abstract

The effects of rare earth addition and hot extrusion process on the grain refinement of magnesium alloy were studied. The as-cast Mg-6Al-1Zn (AZ61) alloy had the average grain size of ~ 64 µm and its microstructure consisted of α-Mg and Mg₁₇Al₁₂ phase. By partial substitution of Al with Gd to reach Mg-4.8Gd-1.2Al-1Zn alloy, it was observed that the Mg₁₇Al₁₂ phase disappeared and two new intermetallic phases, i.e. (Mg,Al)₃Gd and Al₂Gd, were identified. The extrusion process showed significant effects on the shape and size of intermetallics and grain size of the matrix. The grain size of the extruded Mg-6Al-1Zn alloy was refined from 64 µm to 13.4 µm as a result of recrystallization. Regarding the Mg-4.8Gd-1.2Al-1Zn alloy, the grain refinement was much more pronounced, where the extruded grain size has been refined from 698 µm to 2.4 µm (extruded at 385 °C) and 1.3 µm (extruded at 320 °C). This was related to the presence of fine and widely dispersed intermetallic phases. Tensile strength and total elongation of extruded alloys were much higher than their as-cast counterparts and the extruded Mg-6Zn-1Al alloy showed magnificent mechanical properties. The latter was related to the absence of intermetallic particles, which act as stress risers.

Keywords

Magnesium alloys

Rare-earth addition

Microstructure

Tensile properties

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