Effect of Aluminum Addition on the Microstructure, Tensile Properties, and Fractography of Cast Mg-Based Alloys

Figure 2

Backscattered electron images showing the size and distribution of the Mg-Al-Zn phase in: (a) A alloy, 4 wt% Al; (b) C alloy, 9 wt% Al; (c) D alloy, 11 wt% Al; (d) E alloy, 14 wt% Al. Note: white particles are Mn-Al phase and gray particles are Mg-Al-Zn phase.

(a)

(b)

(c)

(d)

(e) Optical microstructure of the C alloy showing (a) Al-Mn phase and (b) Mg₁₇(Al,Zn)₁₂ phase; note its eutectic morphology