|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Precipitation Behavior of Mg-Al-Sn-Zn(-Na) Alloys
||Sumi Jo, Yohan Go, Kwang Seon Shin, Bong Sun You, Young Min Kim
|On-Site Speaker (Planned)
||Young Min Kim
Mg-Sn-Zn(-Na) alloys (Sn: >8wt.%) with high yield strength were recently developed via extrusion process. According to previous results, Sn is known as a strong precipitation hardening element through the formation of fine Mg<SUB>2</SUB>Sn precipitates, and the dilute addition of Na can promote precipitation kinetics for Mg<SUB>2</SUB>Sn and increase their number density by means of providing Sn-Na clusters. In contrast, however, the role of Sn in Mg-Al-Zn-Sn system, of which major second phase is Mg<SUB>17</SUB>Al<SUB>12</SUB>, has not been clearly understood, and furthermore the effect of Na is still questionable in high-Al containing alloys. In the present study, therefore, we investigated the effect of the addition of Sn or Na on precipitation behavior of Mg-Al based alloys. The results of TEM analyses showed that in Mg-Al-Sn-Zn alloys (Al: 6~8wt.%) Mg<SUB>17</SUB>Al<SUB>12</SUB> precipitates formed first inside grains during artificial aging treatment provided nucleation sites for Mg<SUB>2</SUB>Sn. Detailed results will be shown at the presentation.