Aging behaviour and precipitate morphologies in Mg–7.7Al–0.5Zn–0.3Mn (wt.%) alloy

Effect of aging temperature on precipitation behavior and mechanical properties of extruded AZ80-Ag alloy

“…6(a). Contrary to that reported by Lai et al [10], who claimed that Widmannstatten structure was the predominant form of continuous precipitates in MgeAl series alloys, in the present work lathshaped precipitates are completely superior to Widmannstatten structure in terms of volume fraction, as shown in Fig. 6(a).…”

“…6(d). This result is contrary to that reported by Lai et al [10], who claimed that the lamellar precipitates only existed at temperatures less than or equal to 250 C. However, oval-shaped precipitates, observed in both 175 C-and 250 C-aged samples, disappear when aged at 300 C. Fig. 7 exhibits the SEM image obtained from the AZ80-Ag sample aged at 350 C. According to MgeAl binary phase diagram [11], solid solubility of Al in Mg matrix is about 7.7 wt.% at 350 C, which is close to the mass percentage of Al in the material studied in this paper (7.8 wt.%).…”

“…continuous and discontinuous precipitates, which occur simultaneously or competitively with each other [16]. For the continuous precipitates (CP), there are two possible morphologies including lath-shaped and rhombic ones, while there exist three kinds of morphologies involving cellular structure, oval-shaped particles and intergranular precipitates for the discontinuous precipitates (DP) [10].…”

Effects of aging treatment on microstructure and mechanical property of an AZ80N magnesium alloy

“…They are bigger particles with size of about 0.5-1 m along the grain boundaries and the finer needle-shape particles with size of about 0.2-0.3 m within the ␣ matrix. These needle-shape particles are similar to Widmanstätten structures, which have some specific crystallographic orientations with the matrix [22][23][24][25][26]. Besides, the precipitate-free zones (PFZ) are obviously observed adjacent to the grain boundaries.…”

Experimental study and phase diagram calculation in Al–Zn–Mg–Si quaternary system

“…Microalloying elements in aluminum-zinc based alloys alter properties by changing the morphology, chemistry, structure, spatial distribution and size of precipitates. It was found that Mg, Si and RE (rare-earth) as alloying elements can significantly improve characteristics of the Al-Zn based alloy, such as AZ alloy [1][2][3] and alloy coating [2,4]. The solid solution phases (Al) and (Si) and the intermetallics Mg 2 Si and MgZn 2 are able to improve the wear resistance of Al-Zn based alloy and the corrosion resistance of the hot-dip Al-Zn alloy coating.…”