Effect of Lanthanum Addition on the Microstructure ofMg-4Al Alloy

Abstract

This research was to determine the effect of rare earth metal (REM) on the as-cast microstructure of Mg-4Al alloy.The rare earth metal used here is Lanthanum to produce Mg-4Al-1.5La alloy. The microstructure was characterized byoptical microscopy. The phases of this alloy were identified by X-ray diffraction. The microstructure of Mg-4Alconsists of α-Mg and grain boundaries with precipitated phase particles. With the addition of Lanthanum, three distinctphases were identified in the X-ray diffraction patterns of the as cast Mg-4Al-1.5La: Mg, Al11La3, Al4La. The Mg17Al12phase was not detected. The addition of Lanthanium increases the hardness and decrease the wear rate of Mg-4Al.

Keywords

• Metallic alloys
• magnesium-aluminum-rare earth alloys
• microstructure.