scholarly journals Influence of the ingot solidification microstructure on the formation kinetics of icosahedral quasicrystalline phase during the crystallization of the corresponding amorphous alloy

2005 ◽  
Vol 54 (10) ◽  
pp. 4556
Author(s):  
Tong Yu-Quan ◽  
Shen Bao-Cheng ◽  
Gan Yu-Sheng ◽  
Yan Zhi-Jie
Keyword(s):  
Amorphous Alloy ◽  
Solidification Microstructure ◽  
Quasicrystalline Phase ◽  
Formation Kinetics ◽  
Icosahedral Quasicrystalline Phase ◽  
Ingot Solidification ◽  
Kinetics Of ◽  
Icosahedral Quasicrystalline

Thermodynamic and kinetic properties of an icosahedral quasicrystalline phase in the Al-Pd-Tc system

2000 ◽  
Vol 42 (12) ◽  
pp. 2177-2183 ◽  
Author(s):  
M. N. Mikheeva ◽  
G. Kh. Panova ◽  
A. A. Teplov ◽  
M. N. Khlopkin ◽  
N. A. Chernoplekov ◽  
...  
Keyword(s):  
Quasicrystalline Phase ◽  
Kinetic Properties ◽  
Icosahedral Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline

scholarly journals Formation of Icosahedral Quasicrystalline Phase in Zr–Al–Ni–Cu–M (M=Ag, Pd, Au or Pt) Systems

1999 ◽  
Vol 40 (10) ◽  
pp. 1181-1184 ◽  
Author(s):  
Akihisa Inoue ◽  
Tao Zhang ◽  
Junji Saida ◽  
Mitsuhide Matsushita ◽  
Min Wei Chen ◽  
...  
Keyword(s):  
Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline

Formation of Icosahedral Quasicrystalline Phase in Zr70TM10Pd20 (TM = Fe, Co, or Cu) Ternary Glassy Alloys

2000 ◽  
Vol 15 (6) ◽  
pp. 1280-1283 ◽  
Author(s):  
M. Matsushita ◽  
J. Saida ◽  
C. Li ◽  
A. Inoue
Keyword(s):  
Glassy Alloy ◽  
Exothermic Reaction ◽  
Icosahedral Phase ◽  
Exothermic Peak ◽  
Quasicrystalline Phase ◽  
Glassy Alloys ◽  
Stage Crystallization ◽  
Icosahedral Quasicrystalline Phase ◽  
Primary Precipitation ◽  
Icosahedral Quasicrystalline

A nanoscale icosahedral quasicrystalline phase was confirmed as a primary precipitation phase in the melt-spun Zr70TM10Pd20 (TM = Fe, Co, or Cu) ternary glassy alloys with a two-stage crystallization process. The onset temperature of the transformation from amorphous to icosahedral phase is 713 K for Fe-, 696 K for Co-, and 680 K for Cu-containing alloys at the heating rate of 0.67 Ks−1. The size of the icosahedral particles is in the range of 20 to 50 nm for the Zr70Cu10Pd20 glassy alloy annealed for 120 s at 720 K. The icosahedral phase has a very fine particle size in a diameter range below 10 nm for the Zr70Fe10Pd20 and Zr70Co10Pd20 alloys. The crystallization reaction after the first exothermic peak results in the transition from the icosahedral to crystalline phases through a sharp exothermic reaction. Thus, the formation of the nanoscale icosahedral phase indicates the possibility that an icosahedral short-range order exists in the present glassy alloys.

Quasicrystalline phase formation in Al62Cu22.5Fe12.5 and Al55Cu22.5Fe12.5Be7 alloys

2001 ◽  
Vol 16 (6) ◽  
pp. 1535-1540 ◽  
Author(s):  
S. M. Lee ◽  
B. H. Kim ◽  
D. H. Kim ◽  
W. T. Kim
Keyword(s):  
Heat Treatment ◽  
Icosahedral Phase ◽  
Partial Replacement ◽  
Quasicrystalline Phase ◽  
Icosahedral Structure ◽  
High Quality ◽  
Icosahedral Quasicrystalline Phase ◽  
Face Centered ◽  
Icosahedral Quasicrystalline ◽  
Conventionally Cast

Formation of the icosahedral quasicrystalline phase in conventionally cast Al62Cu25.5Fe12.5 and Al55Cu25.5Fe12.5Be7 alloys were investigated. The icosahedral phase (I-phase) forming ability was greatly improved by partial replacement of Al by 7 at.% Be. The as-cast Al55Cu25.5Fe12.5Be7 alloy consisted of dendritic primary I-phase and interdendritic τ-phase, whereas that of an as-cast Al62Cu25.5Fe12.5 alloy consisted of various phases such as the β-, I-, and τ-phases, together with a small amount of the λ- and η-phases. The kinetic barrier for transformation into single I-phase by heat treatment was greatly reduced in an Al55Cu25.5Fe12.5Be7 alloy. The I-phase in an Al55Cu25.5Fe12.5Be7 alloy has the same face centered icosahedral structure as that in an Al62Cu25.5Fe12.5 alloy and is of high quality without phason strain.

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