|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 Mg2Sn precipitates, and the dilute addition of Na can promote precipitation kinetics for Mg2Sn 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 Mg17Al12, 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.%) Mg17Al12 precipitates formed first inside grains during artificial aging treatment provided nucleation sites for Mg2Sn. Detailed results will be shown at the presentation.