scholarly journals Forge-Hardened TiZr Null-Matrix Alloy for Neutron Scattering under Extreme Conditions

Metals ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2340-2350 ◽  
Author(s):  
Takuo Okuchi ◽  
Akinori Hoshikawa ◽  
Toru Ishigaki
Keyword(s):  
Neutron Scattering ◽  
Matrix Alloy ◽  
Extreme Conditions ◽  
Null Matrix

A null-matrix alloy for neutron diffraction

1968 ◽  
Vol 1 (9) ◽  
pp. 945-946 ◽  
Author(s):  
J H Smith ◽  
E R Vance ◽  
D A Wheeler
Keyword(s):  
Neutron Diffraction ◽  
Matrix Alloy ◽  
Null Matrix

Neutron scattering at BENSC under extreme conditions: Up to 17 tesla and down to 25mK

Neutron News ◽  
2001 ◽  
Vol 12 (3) ◽  
pp. 12-18 ◽  
Author(s):  
Michael Meissner ◽  
Peter Smeibidl
Keyword(s):  
Neutron Scattering ◽  
Extreme Conditions

Embrittlement of titanium-zirconium 'null-matrix' alloy by deuterium

2008 ◽  
Vol 16 (3) ◽  
pp. 127-132 ◽  
Author(s):  
E. MacA. Gray ◽  
I. F. Bailey
Keyword(s):  
Matrix Alloy ◽  
Titanium Zirconium ◽  
Null Matrix

scholarly journals Fragility of Bioprotectant Glass-Forming Systems in Extremophiles

2009 ◽  
Vol 2009 ◽  
pp. 1-9
Author(s):  
S. Magazù ◽  
F. Migliardo
Keyword(s):  
Glass Transition ◽  
Neutron Scattering ◽  
Functional State ◽  
Extreme Conditions ◽  
Dynamical Transition ◽  
Elastic Neutron ◽  
Glass Forming ◽  
Dynamical Regimes ◽  
Dynamical Properties ◽  
Elastic Neutron Scattering

A central issue in the adaptation of proteins and enzymes to extreme conditions is the conservation of their functional state, which is characterized by a well-balanced compromise of stability and flexibility. In this review work an overview of elastic neutron scattering (ENS) findings on a class of bioprotectant glass-forming systems, such as trehalose and its homologous (maltose and sucrose) water mixtures, is presented as a function of temperature and concentration. ENS, in fact, allows to determine some remarkable quantities in order to characterize the correlation among dynamical properties, the flexibility and fragility of biomolecules. The experimental results have pointed out a dynamical transition, which shows a crossover in molecular fluctuations between harmonic and anharmonic dynamical regimes. The ENS findings allow to characterize both the trehalose rigidity and flexibility, which are strictly connected to its superior bioprotective effectiveness. In this frame the lowest flexibility and fragility character of trehalose/H2O mixture with respect to maltose and sucrose/H2O mixtures indicate a better attitude to encapsulate biostructures in more rigid and temperature insensitive structures in approaching the glass transition.

Development of a system for generating triple extreme conditions for neutron scattering experiments

1997 ◽  
Vol 241-243 ◽  
pp. 145-147
Author(s):  
S Kawano ◽  
A Moriai ◽  
A Ohtomo ◽  
S Fukui ◽  
A Onodera ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Extreme Conditions

TEM examination of 2014-SiC metal matrix composite

1988 ◽  
Vol 46 ◽  
pp. 726-727
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
P. K. Liaw
Keyword(s):  
Metal Matrix Composite ◽  
Metal Matrix Composites ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Tensile Deformation ◽  
Microstructural Characterization ◽  
Thin Foil ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Ion Milling

Aluminum-based metal matrix composites offer unique combinations of high specific strength and high stiffness. The improvement in strength and stiffness is related to the particulate reinforcement and the particular matrix alloy chosen. In this way, the metal matrix composite can be tailored for specific materials applications. The microstructural characterization of metal matrix composites is thus important in the development of these materials. In this study, the structure of a p/m 2014-SiC particulate metal matrix composite has been examined after extrusion and tensile deformation.Thin-foil specimens of the 2014-20 vol.% SiCp metal matrix composite were prepared by dimpling to approximately 35 μm prior to ion-milling using a Gatan Dual Ion Mill equipped with a cold stage. These samples were then examined in a Philips 400T TEM/STEM operated at 120 kV. Two material conditions were evaluated: after extrusion (80:1); and after tensile deformation at 250°C.

Local atomic structure of relaxor ferroelectric solids studied by pulsed neutron scattering

1994 ◽  
Vol 52 ◽  
pp. 554-555
Author(s):  
T. Egami ◽  
H. D. Rosenfeld ◽  
S. Teslic
Keyword(s):  
Neutron Scattering ◽  
Atomic Structure ◽  
Argonne National Laboratory ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Crystallographic Structure ◽  
Chemical Inhomogeneity ◽  
Distribution Analysis ◽  
Ferroelectric Transition ◽  
Pulsed Neutron

Relaxor ferroelectrics, such as Pb(Mg1/3Nb2/3)O3 (PMN) or (Pb·88La ·12)(Zr·65Ti·35)O3 (PLZT), show diffuse ferroelectric transition which depends upon frequency of the a.c. field. In spite of their wide use in various applications details of their atomic structure and the mechanism of relaxor ferroelectric transition are not sufficiently understood. While their crystallographic structure is cubic perovskite, ABO3, their thermal factors (apparent amplitude of thermal vibration) is quite large, suggesting local displacive disorder due to heterovalent ion mixing. Electron microscopy suggests nano-scale structural as well as chemical inhomogeneity.We have studied the atomic structure of these solids by pulsed neutron scattering using the atomic pair-distribution analysis. The measurements were made at the Intense Pulsed Neutron Source (IPNS) of Argonne National Laboratory. Pulsed neutrons are produced by a pulsed proton beam accelerated to 750 MeV hitting a uranium target at a rate of 30 Hz. Even after moderation by a liquid methane moderator high flux of epithermal neutrons with energies ranging up to few eV’s remain.

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