scholarly journals Improvement of High Field Performances of Bronze-Processed Nb3Sn Superconductors by Titanium Addition to the Matrix

1985 ◽  
Vol 49 (10) ◽  
pp. 913-920 ◽  
Author(s):  
Hisashi Sekine ◽  
Yasuo Iijima ◽  
Kikuo Itoh ◽  
Kyoji Tachikawa
Keyword(s):  
High Field ◽  
Titanium Addition ◽  
The Matrix

Composite‐processed Nb3Sn with titanium addition to the matrix

1982 ◽  
Vol 53 (7) ◽  
pp. 5354-5356 ◽  
Author(s):  
K. Tachikawa ◽  
H. Sekine ◽  
Y. Iijima
Keyword(s):  
Titanium Addition ◽  
The Matrix

Effect of Titanium Addition on Composite L12 Precipitates in Aluminum-Zirconium Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 279-284 ◽  
Author(s):  
Takashi Maeshima ◽  
Hideaki Matsuoka
Keyword(s):  
Three Dimensional ◽  
Particle Morphology ◽  
High Resolution Electron Microscopy ◽  
Atom Probe ◽  
Atomic Ratio ◽  
Nanometer Scale ◽  
Titanium Addition ◽  
Resolution Electron ◽  
The Matrix ◽  
L12 Structure

The particle morphology and composition of nanometer-scale Al3(Zr1-xTix) precipitates formed after aging at 450 °C for 1 h in Al-0.3mol%Zr-0.5mol%Ti alloy were investigated using high resolution electron microscopy (HREM) and three dimensional atom probe tomography (3D-APT). The alloy exhibits an inhomogeneous distribution of solute atoms after casting. After aging, Al3(Zr1-xTix) precipitates with a metastable L12 structure formed within solute-enriched dendrites. The Al3(Zr1-xTix) precipitate particles were spherical with diameters between 3 and 5 nm. The Al3(Zr1-xTix) precipitates were found to be coherent with matrix using HREM. Interfacial segregation of Ti at the matrix/precipitates was also observed in the composite Al3(Zr1-xTix) precipitates. The Zr:Ti atomic ratio in the Al3(Zr1-xTix) precipitates measured by 3D-APT was approximately 7 (x=0.125).

Major scattering processes

2020 ◽  
pp. 379-416
Author(s):  
Sandip Tiwari
Keyword(s):  
Matrix Element ◽  
Cross Section ◽  
High Field ◽  
Phonon Scattering ◽  
Quantum Mechanical ◽  
Coulomb Scattering ◽  
Particle Interactions ◽  
Relative Importance ◽  
Scattering Cross ◽  
The Matrix

This chapter discusses major scattering processes found in semiconductors, including phonon scattering (deformation scattering, piezoelectric scattering, polar scattering and non-polar scattering), scattering arising from impurities (charged, so a Coulomb scattering, and charge neutral) and scattering arising in compositional randomness, from carrier-carrier events and due to coupled-particle interactions. The discussion starts by making connections between the classical scattering cross-section and its quantum-mechanical origins through the matrix elements for scattering. The ability to write the matrix element is employed for describing scattering by phonons in its various forms, for impurities and their various levels of accuracy of the description. Umklapp processes are described. When multiple scattering processes are present, the resulting transport manifests the processes’ independence and dependence. With an understanding of the scattering, observed behavior in semiconductors of interest is summarized to show their relative importance. The chapter concludes by discussing frequency and high field behavior manifested by electron ensembles.

The Effect of Titanium Addition on Microstructure and Properties of Laves Phase Cr2Nb Alloy Synthesized by Hot Pressing

2011 ◽  
Vol 328-330 ◽  
pp. 1102-1108 ◽  
Author(s):  
Xuan Xiao ◽  
Shi Qiang Lu ◽  
Xian Juan Dong ◽  
Ming Gang Huang ◽  
Jun Wei Liu
Keyword(s):  
Fracture Toughness ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Laves Phase ◽  
Nominal Composition ◽  
Second Phase ◽  
Titanium Addition ◽  
Fine Grain ◽  
The Matrix ◽  
Homogeneous Composition

The composite materials with a nominal composition of Cr2Nb-24wt.%Ti were fabricated by mechanical alloying followed by hot pressing. The microstructures and properties were investigated on the composites contained with Laves phase prepared through 20 hours mechanical alloying of chromium, niobium and titanium elemental powders and hot pressing at 1250°C for half an hour. The results indicate that the near full-dense Laves phase Cr2(Nb,Ti) based alloy with homogeneous composition and microstructure is obtained by mechanical alloying and hot pressing techniques. The dispersed soft second phase Nb solid solutions with the fine grain size less than 1μm are distributed uniformly on the matrix. The sample has a relative density of 99%, fracture toughness of 5.32MPa•m1/2 and compress strength of 2080MPa. Due to the effect of fine-grain and alloying addition, the toughening of the Cr2(Nb,Ti) based alloy has been fully realized.

Improvements in current-carrying capacities of Nb<inf>3</inf>Sn composites in high fields through titanium addition to the matrix

1983 ◽  
Vol 19 (3) ◽  
pp. 1429-1432 ◽  
Author(s):  
H. Sekine ◽  
Y. Iijima ◽  
K. Itoh ◽  
K. Tachikawa ◽  
Y. Tanaka ◽  
...  
Keyword(s):  
Titanium Addition ◽  
The Matrix ◽  
High Fields

FIELD-INDUCED ABSORPTION IN HYDROGEN

1958 ◽  
Vol 36 (8) ◽  
pp. 1022-1039 ◽  
Author(s):  
M. F. Crawford ◽  
R. E. MacDonald
Keyword(s):  
Matrix Element ◽  
High Field ◽  
Mean Value ◽  
Absorption Coefficients ◽  
High Field Strength ◽  
Vibration Absorption ◽  
The Matrix ◽  
The Mean ◽  
Experimental Values ◽  
Good Agreement

This paper reports an investigation of the fundamental rotation–vibration absorption induced in hydrogen by an electric field. The integrated absorption coefficients of the first four components of the Q branch have been measured for a range of field strengths at densities of 83.9 and 44.6 Amagat. The integrated absorption coefficient of the S(1) line has been determined at the higher density for one high field strength. The relative intensities of the Q components are in good agreement with the predicted ratios. Accurate experimental values of the matrix element of the mean value of the polarizability, (α)01, and the matrix element of its anisotropy, (γ)01 have been obtained. They are: (α)01 = 0.968 × 10−25 cm3, and (γ)01 = 0.72 × 10−25 cm3 at 83.9 Amagat, and are only slightly dependent on density. The frequencies of the lines have been measured. Only Q(1) and S(1) show a measurable shift with density. The optical collision diameter has been determined and is very small, 0.26 Å.

Improvement in high‐field critical currents ofinsituprocessed Nb3Sn by titanium addition

1983 ◽  
Vol 43 (12) ◽  
pp. 1129-1131 ◽  
Author(s):  
Y. Yoshida ◽  
K. Togano ◽  
K. Tachikawa
Keyword(s):  
High Field ◽  
Critical Currents ◽  
Titanium Addition

A STUDY IN INDUCED POLARIZATION

Geophysics ◽  
1964 ◽  
Vol 29 (5) ◽  
pp. 848-864 ◽  
Author(s):  
L. A. Anderson ◽  
G. V. Keller
Keyword(s):  
High Field ◽  
Field Measurements ◽  
Induced Polarization ◽  
Laboratory Measurements ◽  
Polarization Measurements ◽  
The Matrix ◽  
Current Densities ◽  
Matrix Resistivity ◽  
Background Effect

Induced polarization in pyritic sandstone arises in part from overvoltage effects and in part from electrolytic polarization. Because induced‐polarization measurements are commonly used to search for sulfides, the electrolytic polarization is an undesirable background effect. Pyrite in sandstone can be located only when overvoltage polarization substantially exceeds electrolytic polarization. Laboratory measurements indicate this is true only if there is ten percent or more pyrite in a rock. However, overvoltage polarization is much larger when low current densities are used, particularly if the matrix resistivity is high. Field measurements indicate that at low current densities as little as one or two percent pyrite may provide sufficient overvoltage polarization to be recognizable in the presence of electrolytic polarization.

Crystalloid Inclusions in Hepatocyte Mitochondria and Their Similarity to Cytoplasmic Crystalloids

1974 ◽  
Vol 32 ◽  
pp. 198-199
Author(s):  
Odell T. Minick ◽  
Hidejiro Yokoo
Keyword(s):  
Liver Disease ◽  
Alcoholic Liver Disease ◽  
Special Interest ◽  
Structural Variations ◽  
Mitochondrial Alterations ◽  
The Matrix ◽  
Crystalloid Inclusions ◽  
Liver Biopsies

Mitochondrial alterations were studied in 25 liver biopsies from patients with alcoholic liver disease. Of special interest were the morphologic resemblance of certain fine structural variations in mitochondria and crystalloid inclusions. Four types of alterations within mitochondria were found that seemed to relate to cytoplasmic crystalloids.Type 1 alteration consisted of localized groups of cristae, usually oriented in the long direction of the organelle (Fig. 1A). In this plane they appeared serrated at the periphery with blind endings in the matrix. Other sections revealed a system of equally-spaced diagonal lines lengthwise in the mitochondrion with cristae protruding from both ends (Fig. 1B). Profiles of this inclusion were not unlike tangential cuts of a crystalloid structure frequently seen in enlarged mitochondria described below.

Coherency loss in γ' precipitates in nickel-base superalloy

1983 ◽  
Vol 41 ◽  
pp. 244-245
Author(s):  
R. A. Ricks ◽  
Angus J. Porter
Keyword(s):  
Lattice Mismatch ◽  
Lattice Parameter ◽  
Nickel Base Superalloy ◽  
Large Size ◽  
The Matrix ◽  
Nimonic 80A ◽  
Interfacial Dislocations ◽  
Nickel Base ◽  
Coherency Loss ◽  
Nimonic 115

During a recent investigation concerning the growth of γ' precipitates in nickel-base superalloys it was observed that the sign of the lattice mismatch between the coherent particles and the matrix (γ) was important in determining the ease with which matrix dislocations could be incorporated into the interface to relieve coherency strains. Thus alloys with a negative misfit (ie. the γ' lattice parameter was smaller than the matrix) could lose coherency easily and γ/γ' interfaces would exhibit regularly spaced networks of dislocations, as shown in figure 1 for the case of Nimonic 115 (misfit = -0.15%). In contrast, γ' particles in alloys with a positive misfit could grow to a large size and not show any such dislocation arrangements in the interface, thus indicating that coherency had not been lost. Figure 2 depicts a large γ' precipitate in Nimonic 80A (misfit = +0.32%) showing few interfacial dislocations.

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