THE SPECIFIC HEAT OF A LITHIUM–MAGNESIUM ALLOY. THE MARTENSITIC TRANSFORMATION

1960 ◽  
Vol 38 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Douglas L. Martin
Keyword(s):  
High Temperature ◽  
Magnesium Alloy ◽  
Martensitic Transformation ◽  
Specific Heat ◽  
Heat Content ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic

The specific heat of an alloy of lithium with 0.95 at.% magnesium has been measured from 20° to 300 deg;K. The specific heat of the body-centered cubic phase is less than that calculated from the Kopp–Neumarin rule. A specilic heat anomaly, due to the martensitic transformation, is observed and has almost the same heat content as the corresponding anomaly for pure lithium but the high-temperature end is of signilicantly different shape.

Analysis of the specific heat of body-centred cubic 3He in a high magnetic field using high-temperature series expansion with a multiple-exchange Hamiltonian

1987 ◽  
Vol 65 (11) ◽  
pp. 1539-1542
Author(s):  
E. Suaudeau ◽  
M. Roger ◽  
M. E. R. Bernier
Keyword(s):  
High Temperature ◽  
Specific Heat ◽  
Series Expansion ◽  
Temperature Series ◽  
The Body ◽  
Cubic Phase ◽  
High Magnetic Fields ◽  
Multiple Exchange ◽  
Particle Exchange ◽  
Order Four

We have extended to order four in β = 1/kBT the high-temperature series expansion for the body-centred cubic phase of solid 3He with a Hamiltonian including two-, three-, and four-particle exchange. The results are used to analyze recent experimental measurements of the specific heat at low temperature and high magnetic fields.

Rapid Thermal Transformation of A-15 Crystal Structure Metallic Thin Films

1995 ◽  
Vol 387 ◽  
Author(s):  
M. J. O'Keefe ◽  
C. L. Cerny
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Physical Vapor Deposition ◽  
Thermal Transformation ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Body Center Cubic

AbstractPhysical vapor deposition of Group VI elements (Cr, Mo, W) can lead to the formation of a metastable A-15 crystal structure under certain processing conditions. Typically, a thermally induced transformation of the metastable A-15 structure into the equilibrium body centered cubic structure has been accomplished by conventional furnace annealing at T/Tm ≈ 0.3 from tens of minutes to several hours. In this study we report on the use of rapid thermal annealing to transform sputter deposited A- 15 crystal structure tungsten and chromium thin films into body centered cubic films within the same temperature range but at times on the order of one minute. The minimum annealing times and temperatures required for complete transformation of the A-15 phase into the BCC phase varied from sample to sample, indicating that the transformation was dependent on the film characteristics. The electrical resistivity of A-15 Cr and W films was measured before and after rapid thermal annealing and was found to significantly decrease after transformation into the body center cubic phase.

Textures of the Hot-Forged Ti6Al4V Alloy

2013 ◽  
Vol 203-204 ◽  
pp. 111-114
Author(s):  
Adam Bunsch ◽  
Wiktoria Ratuszek ◽  
Małgorzata Witkowska ◽  
Joanna Kowalska ◽  
Aneta Łukaszek-Sołek
Keyword(s):  
Deformation Temperature ◽  
Phase State ◽  
Hexagonal Phase ◽  
Ti6al4v Alloy ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Two Phase ◽  
Different Temperatures

This paper presents the results of the texture investigation in the hexagonal phase and the body-centered cubic  phase of the Ti6Al4V alloy hot-deformed by forging. Forging was performed at two different temperatures on the occurrence of the single  and in the two-phase  +  state. It was found that after deformation both  and  phases are textured and their textures strongly depends on deformation temperature.

Shear-Induced Orientational Transitions in the Body-Centered Cubic Phase of a Diblock Copolymer Gel

1998 ◽  
Vol 31 (12) ◽  
pp. 3906-3911 ◽  
Author(s):  
I. W. Hamley ◽  
J. A. Pople ◽  
J. P. A. Fairclough ◽  
A. J. Ryan ◽  
C. Booth ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Orientational Transitions

Confinement Effect on the Body-Centered-Cubic Phase of Diblock Copolymers in Film

2008 ◽  
Vol 17 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Hongge Tan ◽  
Qinggong Song ◽  
Shuang Yang ◽  
Dadong Yan ◽  
An-Chang Shi
Keyword(s):  
Diblock Copolymers ◽  
The Body ◽  
Confinement Effect ◽  
Cubic Phase ◽  
Body Centered Cubic

Epitaxial growth and shearing of the body centered cubic phase in diblock copolymer melts

1994 ◽  
Vol 38 (4) ◽  
pp. 999-1027 ◽  
Author(s):  
Kurt A. Koppi ◽  
Matthew Tirrell ◽  
Frank S. Bates ◽  
Kristoffer Almdal ◽  
Kell Mortensen
Keyword(s):  
Epitaxial Growth ◽  
Diblock Copolymer ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Copolymer Melts

Shear-induced orientation of the body-centered-cubic phase in a diblock copolymer gel

1998 ◽  
Vol 58 (6) ◽  
pp. 7620-7628 ◽  
Author(s):  
I. W. Hamley ◽  
J. A. Pople ◽  
C. Booth ◽  
L. Derici ◽  
M. Impéror-Clerc ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic

scholarly journals Dynamical stabilization of the body centered cubic phase in lanthanum and thorium by phonon–phonon interaction

2009 ◽  
Vol 21 (17) ◽  
pp. 175402 ◽  
Author(s):  
P Souvatzis ◽  
T Björkman ◽  
O Eriksson ◽  
P Andersson ◽  
M I Katsnelson ◽  
...  
Keyword(s):  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Phonon Interaction

scholarly journals Alloying-Driven Phase Stability in Group-VB Transition Metals under Compression

2011 ◽  
Vol 1369 ◽  
Author(s):  
Alexander Landa ◽  
Per Söderlind
Keyword(s):  
Transition Metals ◽  
Band Structure ◽  
Phase Stability ◽  
The Body ◽  
Cubic Phase ◽  
Body Centered Cubic ◽  
Transition Series ◽  
Transverse Acoustic ◽  
Band Structure Energy ◽  
Bcc Phase

ABSTRACTThe change in phase stability of Group-VB (V, Nb, and Ta) transition metals due to pressure and alloying is explored by means of first-principles electronic-structure calculations. It is shown that under compression stabilization or destabilization of the ground-state body-centered cubic (bcc) phase of the metal is mainly dictated by the band-structure energy that correlates well with the position of the Kohn anomaly in the transverse acoustic phonon mode. The predicted position of the Kohn anomaly in V, Nb, and Ta is found to be in a good agreement with data from the inelastic x-ray or neutron scattering measurements. In the case of alloying the change in phase stability is defined by the interplay between the band-structure and Madelung energies. We show that band-structure effects determine phase stability when a particular Group-VB metal is alloyed with its nearest neighbors within the same d-transition series: the neighbor with less and more d electrons destabilize and stabilize the bcc phase, respectively. When V is alloyed with neighbors of a higher (4d- or 5d-) transition series, both electrostatic Madelung and band-structure energies stabilize the body-centered-cubic phase. The opposite effect (destabilization) happens when Nb or Ta is alloyed with neighbors of the 3d-transition series.

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