| Title |
Formation and Growth of Widmanstatten HCP α phase in Mg - Li - Al Alloy |
| Authors |
조범진(Bum Jin Cho) ; 김도향(Do Hyang Kim) ; 홍준표(Chun Pyo Hong) |
| Abstract |
Formation and growth of Widmansta¨tten HCP α phase in Mg-10wt%Li-3wt%Al has been investigated. Formation of Widmanstatten α phase has been investigated in detail by changing the cooling rate, i.e. by adopting the methods of water-quenching, air-cooling, and furnace-cooling. Growth of Widmansta¨tten α phase has been investigated by aging at 270℃. Widmansta¨tten type α phase becomes much finer with increasing cooling rate, resulting in higher hardness. The orientation relationship between Widmansta¨tten α phase precipitates and β phase matrix is:[21￣1]_α//[110]_β, (1￣11)_β//(101￣0)_α, Growth rate along the long axis of Widmanstatten α phase is 18.2㎛/hr. On the other hand, thickening rate is near zero, suggesting that ledges are not supplied sufficiently to the interface. |