Abstract
As-cast microstructure of Mg-rich Mg68Zn28Y4 has been investigated by a detailed transmission electron microscopy study: The as-cast Mg68Zn28Y4 alloy consisted of three different types of phases: 10-20 μm size primary solidification phase, dendritic phase grown from the primary phase and a eutectic structure formed at the later stage of solidification. The primary solidification phase has an icosahedral structure with a large degree of phason strain. 1/1 rhombohedral approximant phase with lattice parameters a = 27.2 Å and α = 63.43° is first observed in Mg-Zn-Y system. The rhombohedral structure can be obtained by introducing phason strain in the six-dimensional face centered hyper-cubic lattice. The decagonal phase nucleates with orientation relationship with the icosahedral phase, and Mg4Zn7 nucleates with orientation relationship with the decagonal phase, indicating a close structural similarity between the three phases. Gradual depletion of Y during solidification plays an important role in heterogeneous nucleation of decagonal and Mg4Zn7 phases from icosahedral and decagonal phases, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 565-570 |
| Number of pages | 6 |
| Journal | Micron |
| Volume | 33 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2002 Oct 19 |
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All Science Journal Classification (ASJC) codes
- Structural Biology
- Materials Science(all)
- Physics and Astronomy(all)
- Cell Biology
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Quasicrystals and related approximant phases in Mg-Zn-Y. / Yi, S.; Park, E. S.; Ok, J. B.; Kim, W. T.; Kim, D. H.
In: Micron, Vol. 33, No. 6, 19.10.2002, p. 565-570.Research output: Contribution to journal › Article
TY - JOUR
T1 - Quasicrystals and related approximant phases in Mg-Zn-Y
AU - Yi, S.
AU - Park, E. S.
AU - Ok, J. B.
AU - Kim, W. T.
AU - Kim, D. H.
PY - 2002/10/19
Y1 - 2002/10/19
N2 - As-cast microstructure of Mg-rich Mg68Zn28Y4 has been investigated by a detailed transmission electron microscopy study: The as-cast Mg68Zn28Y4 alloy consisted of three different types of phases: 10-20 μm size primary solidification phase, dendritic phase grown from the primary phase and a eutectic structure formed at the later stage of solidification. The primary solidification phase has an icosahedral structure with a large degree of phason strain. 1/1 rhombohedral approximant phase with lattice parameters a = 27.2 Å and α = 63.43° is first observed in Mg-Zn-Y system. The rhombohedral structure can be obtained by introducing phason strain in the six-dimensional face centered hyper-cubic lattice. The decagonal phase nucleates with orientation relationship with the icosahedral phase, and Mg4Zn7 nucleates with orientation relationship with the decagonal phase, indicating a close structural similarity between the three phases. Gradual depletion of Y during solidification plays an important role in heterogeneous nucleation of decagonal and Mg4Zn7 phases from icosahedral and decagonal phases, respectively.
AB - As-cast microstructure of Mg-rich Mg68Zn28Y4 has been investigated by a detailed transmission electron microscopy study: The as-cast Mg68Zn28Y4 alloy consisted of three different types of phases: 10-20 μm size primary solidification phase, dendritic phase grown from the primary phase and a eutectic structure formed at the later stage of solidification. The primary solidification phase has an icosahedral structure with a large degree of phason strain. 1/1 rhombohedral approximant phase with lattice parameters a = 27.2 Å and α = 63.43° is first observed in Mg-Zn-Y system. The rhombohedral structure can be obtained by introducing phason strain in the six-dimensional face centered hyper-cubic lattice. The decagonal phase nucleates with orientation relationship with the icosahedral phase, and Mg4Zn7 nucleates with orientation relationship with the decagonal phase, indicating a close structural similarity between the three phases. Gradual depletion of Y during solidification plays an important role in heterogeneous nucleation of decagonal and Mg4Zn7 phases from icosahedral and decagonal phases, respectively.
UR - http://www.scopus.com/inward/record.url?scp=0036389779&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036389779&partnerID=8YFLogxK
U2 - 10.1016/S0968-4328(02)00013-6
DO - 10.1016/S0968-4328(02)00013-6
M3 - Article
C2 - 12020703
AN - SCOPUS:0036389779
VL - 33
SP - 565
EP - 570
JO - Micron
JF - Micron
SN - 0968-4328
IS - 6
ER -