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Quasicrystal as a Reinforcement Material in Magnesium Alloys
Author(s) -
Chang Hye Jung,
Kim Won Tae,
Kim Do Hyang
Publication year - 2011
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.201100133
Subject(s) - quasicrystal , volume fraction , formability , phase (matter) , ductility (earth science) , composite material , chemistry , magnesium , hardening (computing) , icosahedral symmetry , metallurgy , dispersion (optics) , materials science , crystallography , creep , organic chemistry , layer (electronics) , physics , optics
The existence of the two‐phase region (icosahedral phase (I‐phase) + α‐Mg) in the Mg‐rich corner of the Mg‐Zn‐Y system indicates that composites consisting of I‐phase and ductile α‐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 I‐phase. 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 α‐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 α‐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.