An investigation on the transformation of the icosahedral phase in the Al-Fe-Cu system during mechanical milling and subsequent annealing

2002 ◽  
Vol 82 (16) ◽  
pp. 2979-2993 ◽  
Author(s):  
N. K. Mukhopadhyay ◽  
T. P. Yadav ◽  
O. N. Srivastava
Keyword(s):  
Mechanical Milling ◽  
Icosahedral Phase ◽  
Subsequent Annealing

Structural evolution during mechanical milling and subsequent annealing of Cu–Ni–Al–Co–Cr–Fe–Ti alloys

2009 ◽  
Vol 118 (2-3) ◽  
pp. 354-361 ◽  
Author(s):  
Yu-Liang Chen ◽  
Ya-Huei Hu ◽  
Che-Wei Tsai ◽  
Jien-Wei Yeh ◽  
Swe-Kai Chen ◽  
...  
Keyword(s):  
Mechanical Milling ◽  
Structural Evolution ◽  
Subsequent Annealing ◽  
Ti Alloys

High coercivity in nanostructured PrCo5-based powders produced by mechanical milling and subsequent annealing

1999 ◽  
Vol 75 (20) ◽  
pp. 3165-3167 ◽  
Author(s):  
Zhongmin Chen ◽  
X. Meng-Burany ◽  
G. C. Hadjipanayis
Keyword(s):  
Mechanical Milling ◽  
Subsequent Annealing ◽  
High Coercivity

Magnetic Hardening of Mechanically Alloyed Pr2Co7

2012 ◽  
Vol 1471 ◽  
Author(s):  
L. Bessais ◽  
R. Fersi ◽  
M. Cabié ◽  
N. Mliki
Keyword(s):  
Magnetic Properties ◽  
Mechanical Milling ◽  
Annealing Temperature ◽  
High Vacuum ◽  
Anisotropy Field ◽  
Milling Process ◽  
Subsequent Annealing ◽  
High Coercivity ◽  
Mechanically Alloyed ◽  
Transmission Electron

ABSTRACTThe Pr2Co7 alloys are known to crystallize in two polymorphic forms: a hexagonal of the Ce2Ni7 type structure and a rhombohedral of the Gd2Co7 one. They were synthesized by mechanical milling and subsequent annealing in high vacuum. In this work, we focus on the structural study of these phases using X-ray diffraction and transmission electron microscopy. Also, we present the evolution of magnetic properties of these compounds vs the annealing temperature. The coercivity increases with annealing temperature reaching a maximum for TA = 800 °C. The highest is equal to 18 kOe at 293 K and 23 kOe at 10 K. The high magnetic properties observed in these nanostructured Pr2Co7 intermetallic alloys have their origin in its relatively high uniaxial magnetocrystalline anisotropy field, and in the homogeneous nanostructure developed by mechanical milling process and subsequent annealing. This high coercivity is attributed to the high anisotropy field of the Pr2Co7 phase and its nanoscale grain size. This leads to the formation of a magnetically hard Pr2Co7 phase.

Fabrication of TiB2 and TiB2/FeB composites by mechanically activated borothermic reduction of ilmenite

1996 ◽  
Vol 11 (4) ◽  
pp. 955-961 ◽  
Author(s):  
P. Millet ◽  
T. Hwang
Keyword(s):  
Amorphous Phase ◽  
Mechanical Milling ◽  
High Energy ◽  
Structural Transformations ◽  
Subsequent Annealing ◽  
Amorphous Boron ◽  
Ilmenite Structure ◽  
Borothermic Reduction

TiB2 and TiB2/FeB composites have been formed at temperatures below 1000 °C, directly from ilmenite sand by reaction with amorphous boron. The structural transformations occurring during high-energy mechanical milling pretreatment and subsequent annealing of different mixtures of the constituents have been studied. On heating at temperature below 800 °C, complete borothermic reduction of the ilmenite structure is accomplished. The mixture so obtained with an ilmenite-boron ratio equal to 1/6 undergoes a sequence of reactions on further heating to form TiB2, FeB, and the amorphous phase B2O2.

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