Strength and ductility of novel Mg–8Sn–1Al–1Zn alloys extruded at different speeds

Strong and ductile heat-treatable Mg–Sn–Zn–Al wrought alloys

“…Fig. 11 summarizes the yield strengths and elongation to failure of various Mg based wrought alloys fabricated by conventional ingot metallurgy process [2,5,6,[9][10][11]15,16,18,[40][41][42][43][44][45][46][47][48][49][50]. The TZAM6620 alloy developed in this work showed better strength-ductility balance compared to previously studied Mg-Sn based alloys and the other commercially available wrought alloys such as Mg-Al-Zn and Mg-Zn alloys.…”

Improved strength of Mg alloy extruded at high speed with artificial cooling

“…It is known that thermally stable Mg 2 Sn particles are dynamically precipitated from a supersaturated a-Mg matrix during extrusion in high-Sn containing Mg alloys such as Mge8Sne1Ale1Zn [6] and Mge9.8Sne1.2Zne1.0Al [12], and that the amount in weight percent of these precipitates generally increases with decreasing extrusion temperature due to a rapid reduction in Sn solid solubility [10]. The SEM images in Fig.…”

“…Indeed, a recent study [5] has shown that the temperature of a Mge1Zne1Mne0.5Ce (wt.%) alloy billet increases from 300 to~380 C when it is extruded at a high speed of 13.5 m/ min, which represents a considerable amount of additional heat. Similarly, Cheng et al [6] have demonstrated that although Mge8Sne1Ale1Zn (wt.%) alloy can be successfully extruded at exit speeds in the range of 2e10 m/min, its YS significantly decreases from 244 to 199 MPa with increasing extrusion speed. This means that although MgeSn based alloys have excellent extrudability, their mechanical properties can be appreciably deteriorated under high-speed extrusion conditions.…”

Improving mechanical properties of extruded Mg–Al alloy with a bimodal grain structure through alloying addition

“…2b), dropping to just 0.42 wt.% at an extrusion temperature of 250 C. This means that most of the Sn content supersaturated in the matrix is consumed by the formation of fine Mg 2 Sn precipitates during extrusion that have a high melting temperature of 770 C, and are therefore considered thermally stable. Indeed, it has been recently reported that MgeSn based alloys such as Mge6.81Sne1.10Ale1.07Zn [16] and Mge7.92Sne0.98Ale0.91Zn [17] can be extruded at high speeds of more than 10 m/min without any surface defects thanks to the excellent thermal stability of the Mg 2 Sn phase, thus demonstrating that Sn addition can help improve the extrudability of AM80 alloy. Moreover, as there is no localized depletion of Al in the matrix, the amount of Mg 17 Al 12 precipitates formed is not affected by the formation of Mg 2 Sn precipitates.…”