pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (25권6호 249-253)
Microstructural Control of AA7075 Alloy for Thixoextrusion
반용융 압출을 위한 AA7075 합금의 조직제어
Young-Ok Yooon*'**, Young-Jig Kim*, Shae K. Kim**, Hyung-Ho Jo**
*Sungkyunkwan Univ., *Korea Institute o f Industrial Technology
The present study focuses on 7075 aluminum wrought alloy to investigate the potential industrial applications of thixoextrusion process. The microstructural evolution of 7075 aluminum wrought alloy for thixoextrusion has been investigated as a function of isothermal holding temperature and time in the partially remelted semisolid state. The results showed that the liquid fraction increased with increasing isothermal holding temperature and time while the average grain size was inversely proportional to isothermal holding temperature and time up to 5min. However, there was no big change of liquid fraction and average grain size with respect to isothermal holding temperature and time. The important fact that the liquid fraction and average grain size were almost uniform after 5 min holding time is considered very useful for thixoextrusion in terms of process control.
Thixoextrusion, AA7075, Partial remelting, Microstructural evolution