Measurement of Long Range Order in the γ’ Phase of Nickel-Base Superalloys

1969 ◽  
Vol 13 ◽  
pp. 598-608
Author(s):  
J.R. Mihalisin
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Temperature Heat ◽  
Long Time ◽  
Nickel Base

The long range order parameter (S) has been measured at room- temperature on the γ’ phase extracted from IN-731 and alloys 713C and 713LC by x-ray diffraction techniques. Measurements were obtained from specimens of IN-731 and alloy 713LC in the as-cast condition and after long time rupture testing. The alloy 713 c specimens were in the as-cast and high temperature heat treated conditions.It was found that long range order in the γ’ phase of IN-731 and alloy 713LC was changed very little after long time rupture testing, and after high temperature heat treatment in the case of alloy 713C.

Exact high temperature series expansions for the XY model

1970 ◽  
Vol 48 (13) ◽  
pp. 1566-1577 ◽  
Author(s):  
D. D. Betts ◽  
C. J. Elliott ◽  
M. H. Lee
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Lattice Gas ◽  
Critical Index ◽  
Temperature Series ◽  
Range Order ◽  
Xy Model ◽  
Long Range Order ◽  
Critical Temperatures ◽  
Quantum Lattice Gas

A method is developed for the exact high temperature series expansion of thermodynamic properties of the spin 1/2 XY model of ferromagnetism or of a quantum lattice gas. Eleven coefficients in the specific heat series for the f.c.c. and b.c.c. lattices and nine coefficients in the series for the fluctuation in the long range order for the f.c.c., b.c.c., and s.c. lattices are calculated. From the fluctuation series the critical temperatures Kc−1 ≡ kTc/J are estimated to be 4.520, 2.902, and 2.02 respectively, while the critical index for the square of the fluctuation in the long range order is γ = 1.35.

scholarly journals Zur Darstellung und Kristallstruktur von β-NbO2 / Synthesis and Crystal Structure of β-NbO2

1982 ◽  
Vol 37 (11) ◽  
pp. 1361-1368 ◽  
Author(s):  
H.-J. Schweizer ◽  
Reginald Gruehn
Keyword(s):  
Crystal Structure ◽  
Long Range ◽  
Chemical Transport ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants

By using chemical transport reactions with various transporting agents (HgCl2, NbCl5, Nb3O7Cl) a slightly substoiehiometric NbO2-phase, β-NbO2, was obtained from samples with O/Nb ∼ 1.5 (source; T > 1373 K) and with deposition temperatures > 1273 K (sink). The rango of composition of β-NbO2 was found to exist from NbO1.990 to NbO1.998.The structure of the tetragonal, column-shaped black crystals was determined by X-ray diffraction. It crystallizes tetragonally in the space group I41 with lattice constants a = 9.693(3) Å, c = 5.985(1) Å and Z = 10 formula units.The crystal structure of β-NbO2 is shown to be a deformed rutile type. As in α-NbO2 the Nb-atoms are grouped in pairs. However, both oxides are different with respect to their long-range order.

Phase relations and superconducting properties of the Y–Ni–B–C system

1999 ◽  
Vol 14 (1) ◽  
pp. 16-23 ◽  
Author(s):  
G. Behr ◽  
W. Löser ◽  
G. Graw ◽  
K. Nenkov ◽  
U. Krämer ◽  
...  
Keyword(s):  
High Temperature ◽  
Intermetallic Phase ◽  
Phase Relations ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Residual Resistance ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

The influence of composition and high-temperature heat treatment on phase content and superconducting properties of the Yni2B2C phase was investigated. Phase relations in those parts of the Y–Ni–B–C quaternary phase diagram, which are relevant for the YNi2B2C intermetallic phase formation, were revealed by x-ray diffraction, optical and scanning electron microscopy, and high-temperature differential thermoanalysis. A widespread interval of superconducting transition temperatures TC = 10.4–15.2 K and small transition width <0.3 K were determined from samples of different nominal compositions after high-temperature annealing. The different intrinsic properties are ascribed to composition variations of the YNi2B2C phase and related to structure parameters, residual resistance ratios, and element concentrations determined by the electron probe microanalysis.

Anomalous x-ray diffraction measurements of long-range order in (001)-texturedL10FePtCu thin films

2012 ◽  
Vol 86 (2) ◽  
Author(s):  
M. Maret ◽  
C. Brombacher ◽  
P. Matthes ◽  
D. Makarov ◽  
N. Boudet ◽  
...  
Keyword(s):  
Thin Films ◽  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
X Ray

Studies of 3d Electrons and Hyperfine Interactions in Ordered and Disordered Fe50Al50 Alloys

2011 ◽  
Vol 399-401 ◽  
pp. 908-911
Author(s):  
Yu Yang Huang ◽  
Li Yuan Qin ◽  
Qin Guan Tian ◽  
Yu Xia Li ◽  
Wen Deng
Keyword(s):  
Mössbauer Spectroscopy ◽  
Positron Annihilation ◽  
Long Range ◽  
Mossbauer Spectroscopy ◽  
Hyperfine Interactions ◽  
Range Order ◽  
Mossbauer Spectrum ◽  
Long Range Order ◽  
Mössbauer Spectrum ◽  
Long Time

The positron annihilation techniques and Mössbauer spectroscopy have been used to study the signals of 3d electrons and the hyperfine interactions in ordered and disorder Fe50Al50alloys. The results show that the signals of 3d electrons of ordered Fe50Al50alloy is very low. Mössbauer spectrum of ordered Fe50Al50alloy shows a singlet, this alloy is paramagnetic. However, Mössbauer spectrum of Fe50Al50powder being ball-milled for 70 h shows a discrete sextet, indicating a decrease in the long-range order within the Fe50Al50powder being ball-milled for a long time.

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