Formation, structure, and crystallization of metastable quasi-crystalline Al–transition metal alloys prepared by rapid solidification

1985 ◽  
Vol 63 (10) ◽  
pp. 1267-1269 ◽  
Author(s):  
R. A. Dunlap ◽  
K. Dini
Keyword(s):  
Thermal Analysis ◽  
Transition Metal ◽  
Crystallite Size ◽  
Crystal Structures ◽  
Rapid Solidification ◽  
Rapid Quenching ◽  
Metal Alloys ◽  
X Ray ◽  
Transition Metal Alloys ◽  
Diffraction Peaks

Metastable Al86Cr14, Al86Mn14, and Al86Fe14 were prepared by rapid quenching from the melt at a rate of approximately 2 × 106 K/s. The X-ray measurements of all three alloys show similar non-Bravais structures. Broadened diffraction peaks for the Al–Fe alloy suggest a crystallite size of about 60 Å. Thermal-analysis measurements show that all of the alloys transform into conventional crystal structures at approximately 670. The crystalline phases for the three alloys are Al11Cr2 + Al, Al6Mn + Al, and Al6Fe + Al. At approximately 800 K, Al–Fe undergoes the further transition Al6Fe → Al3Fe + Al.

On the question of stability and disorder in icosahedral aluminum – transition metal alloys

1989 ◽  
Vol 67 (5) ◽  
pp. 463-467 ◽  
Author(s):  
D. W. Lawther ◽  
R. A. Dunlap ◽  
V. Srinivas
Keyword(s):  
Thermal Analysis ◽  
Transition Metal ◽  
Phase Formation ◽  
Strong Interaction ◽  
Metal Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Metal Alloys ◽  
Melt Spun

Through an X-ray diffraction and thermal analysis investigation of melt spun Al – transition metal (Al–TM) alloys, we report the formation of a highly stable and well-ordered pure icosahedral (i) phase in Al80TMl20−xTM2x(TM1 = V, Cr; TM2 = Fe, Co). The superior i-phase formation over that in the binary Al–TM alloys is interpreted in terms of the distribution of TM sites known to exist in this phase. A comparison of the i-phase formation ranges indicates the presence of two distinct classes of TM sites and a strong interaction between adjacent TM sites.

Soft X-Ray Absorption and Electronic Structure of Al-Based 3d-Transition Metal Alloys

1979 ◽  
Vol 46 (2) ◽  
pp. 599-607 ◽  
Author(s):  
Takaaki Hanyu ◽  
Shigeo Yamaguchi ◽  
Hideaki Koike ◽  
Shigeru Sato
Keyword(s):  
Electronic Structure ◽  
Transition Metal ◽  
Metal Alloys ◽  
X Ray ◽  
Transition Metal Alloys ◽  
X Ray Absorption

Amorphization of rapidly quenched quasicrystalline Al-transition metal alloys by the addition of Si

1986 ◽  
Vol 1 (3) ◽  
pp. 415-419 ◽  
Author(s):  
R.A. Dunlap ◽  
K. Dini
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Metal Alloys ◽  
Icosahedral Symmetry ◽  
Quench Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Metal Alloys ◽  
Rapidly Solidified ◽  
Thermal Stability Of

The structure and thermal stability of rapidly solidified Al-Cr-Si, Al-Mn-Si, Al-Fe-Si, Al-Co-Si, and Al-Ni-Si alloys have been investigated using x-ray diffraction and thermal analysis measurements. Each series of alloys shows a region of stoichiometry that yields icosahedral symmetry and a region that yields an amorphous phase. Thermal and structural properties of these alloys are reported as a function of stoichiometry and quench rate.

scholarly journals Magneto-x-ray effects in transition-metal alloys

1997 ◽  
Vol 55 (19) ◽  
pp. 12826-12828 ◽  
Author(s):  
H. J. Gotsis ◽  
P. Strange
Keyword(s):  
Transition Metal ◽  
Metal Alloys ◽  
X Ray ◽  
Transition Metal Alloys ◽  
Ray Effects

Quasiperiodic Crystals: A Revolution in Crystallography

MRS Bulletin ◽  
1986 ◽  
Vol 11 (2) ◽  
pp. 9-14 ◽  
Keyword(s):  
Electron Diffraction ◽  
Transition Metal ◽  
Rapid Solidification ◽  
Research Society ◽  
Metal Alloys ◽  
Tower Of Babel ◽  
Transition Metal Alloys ◽  
Materials Research ◽  
Diffraction Picture ◽  
At Home

At the beginning of my career, I encountered a book that Professor Von Hippel edited. In the Preface to that book he wrote the following: “Many foresee that science and industry are building a Tower of Babel and thai this undertaking will be halted as in Biblical times: the laborers, more and more specialized, will finally cease to understand each other. The editor, for one, does not share this is gloomy conviction. On the contrary, as our knowledge grows, old boundaries vanish and the view expands to broader horizons. However, people accustomed to boundaries in certain places tend still to respect them after their actual disappearance. To make them feel at home with their new neighbors is a driving motive of this book and its companion volume.”The Materials Research Society, being dedicated to interdisciplinariness, has shared Prof. Von Hippel's optimism, and I hope that in this lecture I can give you a small inkling of how interdisciplinary our current research is and how many different fields it touches.The work that I am going to discuss resulted from the rapid solidification study of aluminum transition metal alloys. One day more than three years ago. Prof. Shechtman, who is the hero of this investigation, came into my office with an electron diffraction picture with ten spots arrayed about the central spots (Figure 1).

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