title: Quasicrystal-reinforced Mg alloys.
abstract: The formation of the icosahedral phase (I-phase) as a secondary solidification phase in Mg-Zn-Y and Mg-Zn-Al base systems provides useful advantages in designing high performance wrought magnesium alloys. The strengthening in two-phase composites (I-phase +α-Mg) can be explained by dispersion hardening due to the presence of I-phase particles and by the strong bonding property at the I-phase/matrix interface. The presence of an additional secondary solidification phase can further enhance formability and mechanical properties. In Mg-Zn-Y alloys, the co-presence of I and Ca2Mg6Zn3phases by addition of Ca can significantly enhance formability, while in Mg-Zn-Al alloys, the co-presence of the I-phase and Mg2Sn phase leads to the enhancement of mechanical properties. Dynamic and static recrystallization are significantly accelerated by addition of Ca in Mg-Zn-Y alloy, resulting in much smaller grain size and more random texture. The high strength of Mg-Zn-Al-Sn alloys is attributed to the presence of finely distributed Mg2Sn and I-phase particles embedded in theα-Mg matrix.
authors.affiliation: Department of Materials Science and Engineering, Center for Non-Crystalline Materials, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea.
authors.forename: Young
authors.initials: Y
authors.lastname: Kyun Kim
authors.affiliation: Department of Optical Engineering, Cheongju University, 36 Naedok-Dong, Cheongju, 360-764, Korea.
authors.forename: Won
authors.initials: W
authors.lastname: Tae Kim
authors.affiliation: Department of Materials Science and Engineering, Center for Non-Crystalline Materials, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul, 120-749, Korea.
authors.forename: Do
authors.initials: D
authors.lastname: Hyang Kim
keywords: Icosahedral phase; Interface; Mg–Zn–Al alloy; Mg–Zn–Y alloy; Quaiscrystal