Enhancement of the Icosahedral Quasicrystalline Phase Forming Ability with Be Addition to an Al62.5Cu25.5Fe12 Alloy

2000 ◽  
Vol 643 ◽  
Author(s):  
S.M. Lee ◽  
B.H. Kim ◽  
W.T. Kim ◽  
D.H. Kim
Keyword(s):  
Thermal Stability ◽  
Solidification Structure ◽  
Partial Replacement ◽  
Quasicrystalline Phase ◽  
Icosahedral Structure ◽  
Icosahedral Quasicrystalline Phase ◽  
Face Centered ◽  
Icosahedral Quasicrystalline ◽  
Phase Relationships ◽  
Conventionally Cast

AbstractThe quasicrystalline phase forming ability, solidification structure, thermal stability, and phase relationships of a series of conventionally-cast Al62-xCu25.5Fe12.5Bex (x=0,1,3,5,7) alloys were investigated. Single icosahedral quasicrystalline phase was successfully obtained by partial replacement of Al with Be (7 at.%) in an Al62Cu25.5Fe12.5 alloy during crucible cooling. The I-phase in an Al55Cu25.5Fe12.5Be7 alloy has the same face-centered icosahedral structure as that in an Al62Cu25.5Fe12.5 alloy, with less phason strain. Hardness of the I-phase increases with x, i.e. from Hv 710 for x=1 to Hv 809 for x=7.

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.

The face-centered icosahedral quasicrystalline phase in Mg-Zn-Y-Zr alloys

1995 ◽  
Vol 23 (4-6) ◽  
pp. 277-281 ◽  
Author(s):  
Dongshan Zhao ◽  
Yali Tang ◽  
Zhiping Luo ◽  
Ningfu Shen ◽  
Renhui Wang ◽  
...  
Keyword(s):  
Quasicrystalline Phase ◽  
The Face ◽  
Icosahedral Quasicrystalline Phase ◽  
Face Centered ◽  
Icosahedral Quasicrystalline ◽  
Zr Alloys

A quasicrystalline transition state in an annealed Al65Cu20Fe15 alloy

1991 ◽  
Vol 6 (2) ◽  
pp. 366-370 ◽  
Author(s):  
Z. Zhang ◽  
N.C. Li ◽  
K. Urban
Keyword(s):  
Transition State ◽  
Fibonacci Numbers ◽  
Quasicrystalline Phase ◽  
Icosahedral Quasicrystal ◽  
Icosahedral Structure ◽  
Slow Cooling ◽  
One Dimensional ◽  
Fundamental Length ◽  
Icosahedral Quasicrystalline Phase ◽  
Icosahedral Quasicrystalline

A quasicrystalline transition state was found in an Al65Cu20Fe15 alloy after heat treatment at 700 °C and subsequent slow cooling of samples originally containing the icosahedral quasicrystalline phase. The transition state is characterized by the simultaneous presence of two types of quasicrystalline domains. Their structure can be obtained by the introduction of one-dimensional periodicity along one of the fivefold axes of the original icosahedral quasicrystal. The two types of domains differ in their period lengths which are obtained by multiplying a fundamental length of the icosahedral structure by the Fibonacci numbers 5 and 8.

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
Sign in / Sign up

Export Citation Format

Share Document