scholarly journals Solid State Synthesis of Non-Equilibrium Phase in Mg-Co and Mg-Fe Systems via Bulk Mechanical Alloying

2003 ◽  
Vol 44 (4) ◽  
pp. 601-610 ◽  
Author(s):  
Tatsuhiko Aizawa ◽  
Ken-Ichi Hasehira ◽  
Chikashi Nishimura
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Equilibrium Phase ◽  
Solid State Synthesis ◽  
Non Equilibrium

Solid-State Synthesis of Magnesium Base Thermoelectric Alloys via Bulk Mechanical Alloying

2006 ◽  
Vol 980 ◽  
Author(s):  
Tatsuhiko Aizawa ◽  
Renbo Song
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Binary Compound ◽  
Solid State Synthesis ◽  
Medium Temperature ◽  
Solid Solution Formation ◽  
Ternary Alloy Systems ◽  
Solution Formation ◽  
Diffusion Controlled ◽  
Electric Structure

AbstractMagnesium binary and ternary alloy systems have been popular as a thermoelectric light-weight alloy to be working in the medium temperature range. The solid-state reactivity via the bulk mechanical alloying is applied to yield these types of alloys. The diffusion-controlled solid-state synthesis is first stated as a process to yield a binary compound, Mg2X (X = Ge, Sn and Pb). This processing is further applied to directly synthesize several ternary thermoelectric alloys Mg2Si1-xGex, Mg2Si1-ySny and Mg2Sn1-zPbz for 0.0 < x, y, z < 1.0 and to evaluate their thermoelectric properties. Hot pressing is used to make full-dense billets and samples for thermoelectric measurement. The effect of germanium and tin contents on their Seebeck coefficient and band-gap is investigated to describe the p-n transition behavior and to understand the change of electric structure with solid solution formation.

Structure and Magnetostriction of Tb0.7Pr0.3FeX Prepared by Solid-State Synthesis

2012 ◽  
Vol 476-478 ◽  
pp. 1459-1462 ◽  
Author(s):  
H.Y Yin ◽  
J.J Liu ◽  
R Wang ◽  
X.C Liu ◽  
N.K Sun ◽  
...  
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Annealing Process ◽  
Laves Phase ◽  
Type Structure ◽  
Solid State Synthesis ◽  
X Ray Diffraction ◽  
Standard Strain ◽  
X Ray ◽  
Magnetoelastic Properties

Mechanical alloying (MA) was used to prepare pseudobinary high Pr-content Tb0.7Pr0.3Fex alloys. The structural and magnetoelastic properties were in investigated by means of x-ray diffraction and a standard strain technique. A single (Tb,Pr)Fe2 Laves phase with MgCu2-type structure for the composition Tb0.7Pr0.3Fe1.80 was synthesized by MA and subsequent annealing process. The high magnetostriction of 600 ppm was achieved at 10 kOe for the epoxy-bonded Tb0.7Pr0.3Fe1.8 composite.

scholarly journals Solid-State Synthesis of Mg2Ni by the Bulk Mechanical Alloying.

1999 ◽  
Vol 46 (10) ◽  
pp. 1097-1102 ◽  
Author(s):  
Tatsuhiko Aizawa ◽  
Toshiro Kuji ◽  
Hiroaki Nakano ◽  
Ken-Ichi Ichige
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Solid State Synthesis

A Modeling Study of Cyclical Phase Transformations

2005 ◽  
Vol 475-479 ◽  
pp. 3081-3086
Author(s):  
Jong K. Lee
Keyword(s):  
Phase Transitions ◽  
Mechanical Alloying ◽  
Phase Transformations ◽  
Molecular Dynamic ◽  
Dynamic Equilibrium ◽  
Equilibrium Phase ◽  
Two Dimensional ◽  
Lennard Jones ◽  
Equilibrium Phases ◽  
Non Equilibrium

Recent work has shown evidence of cyclical phase transformations taking place during mechanical alloying. Cyclical phase transformations resemble dynamic equilibrium in the sense that both equilibrium and non-equilibrium phases are simultaneously present during milling, but phase fractions vary during cyclical transformations. A brief thermodynamic and kinetic account is first discussed to establish the criteria for cyclical transformations. A two-dimensional molecular dynamic work is then presented to demonstrate cyclical phase transitions between an equilibrium and a non-equilibrium phase during mechanical alloying. A model binary crystal made of 57 Lennard-Jones atoms is studied to illustrate cyclical transitions between an equilibrium rhombus and a non-equilibrium square phase.

scholarly journals Solid-State Synthesis of Hydrogen Storage Mg2Co Alloys via Bulk Mechanical Alloying

2006 ◽  
Vol 47 (4) ◽  
pp. 1052-1057 ◽  
Author(s):  
Yijing Wang ◽  
Tatsuhiko Aizawa ◽  
Chikashi Nishimura
Keyword(s):  
Solid State ◽  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Solid State Synthesis ◽  
Co Alloys

Non-Equilibrium Phase Formation in Fe-Ag-Cu System by Mechanical Alloying

1992 ◽  
Vol 88-90 ◽  
pp. 459-466 ◽  
Author(s):  
Keisuke Uenishi ◽  
Kojiro F. Kobayashi ◽  
Keiichi N. Ishihara ◽  
Paul Hideo Shingu
Keyword(s):  
Mechanical Alloying ◽  
Phase Formation ◽  
Equilibrium Phase ◽  
Non Equilibrium
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