Metastable Phase Formation in Mechanically Alloyed Sm-Co-Fe

1997 ◽  
Vol 481 ◽  
Author(s):  
P. A. I. Smith ◽  
J. Ding ◽  
P. G. McCormick ◽  
R. Street
Keyword(s):  
Phase Formation ◽  
Metastable Phase ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Two Phase ◽  
Fe Content ◽  
Energy Of Mixing ◽  
Metastable Phase Formation ◽  
Free Energy Of Mixing ◽  
Bcc Phase

ABSTRACTA detailed phase analysis of mechanically alloyed (Sm0.18Co0.82)100-xFex powders has been performed using X-ray diffraction and Mössbauer spectroscopy. A two-phase structure develops as the Fe content is increased, with an increasing proportion of bcc Fe-Co in addition to amorphous Sm-Co-Fe. Both phases become richer in Fe, but Fe is concentrated in the bcc phase, due to a limited ability of Fe to substitute in amorphous Sm-Co. Changes in phase formation with increasing Fe content can be correlated with changes in the calculated free energy of mixing of amorphous Sm-Co-Fe.

Critical undercoolings for the formation of metastable phase and its morphologies solidified from undercooled Fe–Co melts

1999 ◽  
Vol 14 (5) ◽  
pp. 1679-1682 ◽  
Author(s):  
Li Mingjun ◽  
Song Guangsheng ◽  
Yang Gencang ◽  
Zhou Yaohe
Keyword(s):  
Phase Formation ◽  
Metastable Phase ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Solidification Behavior ◽  
Metastable Phase Formation ◽  
Bcc Phase ◽  
Co Alloys ◽  
Undercooled Melts

The maximum undercoolings of 304, 318, 308, and 296 K were achieved, respectively, in Fe-22, 26, 30, and 34 at.% Co alloys. The metastable bcc phase nucleated from melts when undercoolings exceeded critical ones. The critical undercoolings for the formation of metastable bcc phase from Fe-22, 26, 30, and 34 at.% Co melts were 104, 156, 204, and 248 K, respectively. The morphologies of as-obtained metastable bcc phase exhibited five typical patterns: dendrite cores with primary and second arms, well-developed second arms, and radiated, lath, and platelike structures. Based on the classical nucleation theory, the solidification behavior of the melts was analyzed with regard to the metastable phase formation when the melts were undercooled greater than critical undercoolings. The formation of various morphologies was also evaluated to consider the solidification behavior of the undercooled melts.

Metastable phase formation in reactively sputtered WxSiy films

1986 ◽  
Vol 4 (6) ◽  
pp. 3117-3120 ◽  
Author(s):  
J. S. Lin ◽  
R. C. Budhani ◽  
G. Pollock ◽  
C. V. Deshpandey ◽  
R. F. Bunshah
Keyword(s):  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation

scholarly journals Modeling of metastable phase formation diagrams for sputtered thin films

2016 ◽  
Vol 17 (1) ◽  
pp. 210-219 ◽  
Author(s):  
Keke Chang ◽  
Denis Music ◽  
Moritz to Baben ◽  
Dennis Lange ◽  
Hamid Bolvardi ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation

Dolomite Decomposition to (Ca,Mg)O Solid Solutions: An X-Ray Diffraction Study.Part II.

1984 ◽  
Vol 39 (10) ◽  
pp. 981-985 ◽  
Author(s):  
G. Spinolo ◽  
U. Anselmi Tamburini
Keyword(s):  
Free Energy ◽  
Low Temperatures ◽  
Particle Sizes ◽  
Diffusional Process ◽  
X Ray Diffraction ◽  
High Iron Content ◽  
X Ray ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing ◽  
Low Pressures

Abstract The full decomposition of dolomites with low and high iron content at low temperatures and low pressures is discussed with reference to the free energy of mixing of the ternary system Ca. Fe, Mg/O. The actual products of the primary step are a couple of rock salt structured oxides close to the spinodal compositions and with very small particle sizes. A subsequent diffusional process can produce large crystallites with equilibrium compositions, but it is effective only when either a low-iron dolomite is used as starting material or higher temperatures are employed.

Metastable Phase Formation in Rapidly Solidified ZrO2-Al2O3 Powders

2003 ◽  
Vol 437-438 ◽  
pp. 407-410 ◽  
Author(s):  
X. Zhou ◽  
R.K. Sadangi ◽  
Bernard H. Kear ◽  
W.R. Cannon
Keyword(s):  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation ◽  
Rapidly Solidified

Metastable phase formation during the reaction of Ni films with Si(001): The role of texture inheritance

2010 ◽  
Vol 107 (9) ◽  
pp. 093515 ◽  
Author(s):  
S. Gaudet ◽  
C. Coia ◽  
P. Desjardins ◽  
C. Lavoie
Keyword(s):  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation
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