Quasicrystal as a Reinforcement Material in Magnesium
- Quasicrystal as a Reinforcement Material in Magnesium
- 장혜정; 김원태; 김도향
- Quasicrystal; Mg alloy; Mechanical properties; Interface; TEM; Formability; alloys; strength
- Issue Date
- Israel journal of chemistry
- VOL 51, NO 11-12, 1176-1184
- The existence of the two-phase region (icosahedral
phase (I-phase) + a-Mg) in the Mg-rich corner of the Mg-
Zn-Y system indicates that composites consisting of I-phase
and ductile a-Mg can be fabricated by a simple solidification
process. Alloys with a range of combined strength and ductility
can be designed by changing the fraction of the Iphase.
Strengthening in proportion with increasing the
volume fraction of I-phase can be explained by the effect of
dispersion hardening due to the presence of finely dispersed
I-phase particles. When quasicrystals exist in the a-Mg matrix as a second phase in Mg-Zn-Y alloys, the quasicrystals
are stable against coarsening during thermomechanical
processes such as hot rolling and high-temperature forming,
due to the low interfacial energy of the quasicrystals with
the a-Mg crystalline matrix, which provides strong bonding
properties at the I-phase/matrix interface. Therefore, quasicrystal-
reinforced Mg-Zn-Y alloys exhibit a much better combination
of mechanical properties and formability than commercially
used alloys such as AZ31 and AZ 61.
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