Quasicrystal as a Reinforcement Material in Magnesium Alloys

Title
Quasicrystal as a Reinforcement Material in Magnesium Alloys
Authors
장혜정김원태김도향
Keywords
Quasicrystal; Mg alloy; Mechanical properties; Interface; TEM; Formability; alloys; strength
Issue Date
2011-12
Publisher
Israel journal of chemistry
Citation
VOL 51, NO 11-12, 1176-1184
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/42008
ISSN
00212148
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KIST Publication > Article
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