Void Swelling of Ferritic Alloys Bombarded with Nickel Ions

2009 ◽  
pp. 809-809-15 ◽  
Author(s):  
WG Johnston ◽  
T Lauritzen ◽  
JH Rosolowski ◽  
AM Turkalo
Keyword(s):  
Nickel Ions ◽  
Ferritic Alloys ◽  
Void Swelling

Void Swelling Resistance in Fe-Cr Alloys at 200 DPA

1994 ◽  
Vol 373 ◽  
Author(s):  
D. S. Gelles
Keyword(s):  
Irradiation Temperature ◽  
The Other ◽  
Dislocation Network ◽  
Fast Breeder Reactor ◽  
Ferritic Alloys ◽  
Density Measurements ◽  
Void Swelling

AbstractMicrostructural examinations have been performed on a series of binary Fe-Cr alloys irradiated to 200 dpa at 425°C in a fast breeder reactor. The alloy compositions rangedfrom 3% to 18% Cr in 3% Cr increments, and the irradiation temperature corresponded to the peak swelling condition for this alloy class. Density measurements showed swelling levels as high as 7.4%, with the highest swelling found in the Fe-9Cr and Fe-6Cr alloys. Microstructural examinations revealed that the highest swelling conditions contained welldeveloped voids, often as large as 100 nm, and a dislocation network comprised of both a2 <111> and <100> Burgers vectors. Swelling was lower in the other alloys, and the swelling reduction could be correlated with increased precipitation. These results are considered in light of the current theories for low swelling in ferritic alloys, but no theory is available to completely explain the results.

Defect Structures during Incubation Period of Void Swelling in Austenitic and Ferritic Alloys Studied by Positron Annihilation Spectroscopy

2013 ◽  
Vol 1526 ◽  
Author(s):  
S. Huang ◽  
K. Miyawaki ◽  
K. Tsujikawa ◽  
M. Horiki ◽  
T. Yoshiie ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Positron Annihilation ◽  
Incubation Period ◽  
Positron Annihilation Spectroscopy ◽  
Defect Structures ◽  
Lifetime Measurements ◽  
Ferritic Alloys ◽  
Positron Annihilation Lifetime ◽  
Annealing Temperatures ◽  
Void Swelling

ABSTRACTIn order to understand the vacancy behavior during incubation period before steady state void swelling, positron annihilation lifetime measurements was performed after isochronal annealing of austenitic stainless steel (Ti added modified SUS316SS) and ferritic stainless steel (F82H) irradiated by neutrons and electrons to a dose of 0.2 dpa. By electron and neutron irradiations below 363 K, vacancies and nano-voids containing of few vacancies were formed in both alloys. By increasing annealing temperatures, the lifetime decreased without forming nano-voids. The change of lifetime during the annealing indicated the formation and growth of staking fault tetrahedra (Ti added modified SUS316SS) and the annihilation of vacancies at precipitates (F82H).

Depth Distribution of Void Swelling Produced by 5 MeV Nickel Ions

1974 ◽  
Vol 32 ◽  
pp. 358-359
Author(s):  
W. G. Johnston ◽  
J. H. Rosolowski ◽  
A. M. Turkalo ◽  
T. Lauritzen
Keyword(s):  
Depth Distribution ◽  
Dose Dependence ◽  
Step Height ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Original Surface ◽  
Void Swelling ◽  
Thin Foils ◽  
Measuring Techniques ◽  
Made In

Our studies of void swelling produced by 5 MeV nickel ion bombardment rely on a theoretically calculated damage curve (Fig. 1). TEM measurements of void swelling are made in thin foils located in the peak damage region (~9000A from the original surface) according to the damage curve. Step-height measurements of swelling1 give the total swelling integrated along the entire ion path and we infer the dose dependence of swelling by assuming the distribution of swelling according to the calculated damage curve. With both measuring techniques the resulting information gives the dependence of swelling (ΔV/Vo) on the displacements per atom (dpa).

ELECTROLESS NICKEL

Alloy Digest ◽  
1986 ◽  
Vol 35 (4) ◽  
Keyword(s):  
Nickel Coating ◽  
Chemical Reduction ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Sodium Hypophosphite ◽  
Work Piece ◽  
Nickel Ions ◽  
Continuous Contact ◽  
Chemical Corporation

Abstract ELECTROLESS NICKEL is a nickel coating deposited by chemical reduction of nickel ions. The most widely used reducing agent is sodium hypophosphite. The thickness of the deposited coating is uniform over all areas of the work-piece that are in continuous contact with fresh plating solution. The process is applicable to a wide variety of metal and nonmetal substrates. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion and wear resistance as well as heat treating and joining. Filing Code: Ni-332. Producer or source: Occidental Chemical Corporation.

The Binding and Viscometric Studies of Ni+2, Co+2 and Mn+2 Ions with Protein by Spectrometric and pH Metric Techniques

2019 ◽  
Vol 9 (2) ◽  
pp. 151-162
Author(s):  
Shveta Acharya ◽  
Arun Kumar Sharma
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Protein Molecule ◽  
Vital Role ◽  
Sufficient Evidence ◽  
Structural Requirement ◽  
Nickel Ions ◽  
Cobalt Ions ◽  
Lower Temperature ◽  
Specific Oxidation

Background: The metal ions play a vital role in a large number of widely differing biological processes. Some of these processes are quite specific in their metal ion requirements. In that only certain metal ions, in specific oxidation states, can full fill the necessary catalytic or structural requirement, while other processes are much less specific. Objective: In this paper we report the binding of Mn (II), Ni (II) and Co (II) with albumin are reported employing spectrophotometric and pH metric method. In order to distinguish between ionic and colloidal linking, the binding of metal by using pH metric and viscometric methods and the result are discussed in terms of electrovalent and coordinate bonding. Methods: The binding of Ni+2, Co+2 and Mn+2 ions have been studied with egg protein at different pH values and temperatures by the spectrometric technique. Results: The binding data were found to be pH and temperature dependent. The intrinsic association constants (k) and the number of binding sites (n) were calculated from Scatchard plots and found to be at the maximum at lower pH and at lower temperatures. Therefore, a lower temperature and lower pH offered more sites in the protein molecule for interaction with these metal ions. Statistical effects seem to be more significant at lower Ni+2, Co+2 and Mn+2 ions concentrations, while at higher concentrations electrostatic effects and heterogeneity of sites are more significant. Conclusion: The pH metric as well as viscometric data provided sufficient evidence about the linking of cobalt, nickel and manganese ions with the nitrogen groups of albumin. From the nature and height of curves in the three cases it may be concluded that nickel ions bound strongly while the cobalt ions bound weakly.

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