scholarly journals Nucleation and growth of voids in shock loaded copper bicrystals

2020 ◽  
Author(s):  
Elizabeth Fortin ◽  
Benjamin Shaffer ◽  
Saul Opie ◽  
Pedro Peralta
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Nucleation and growth of voids by radiation

1980 ◽  
Vol 95 (1-2) ◽  
pp. 44-45 ◽  
Author(s):  
R.M. Mayer ◽  
L.M. Brown ◽  
U. Gösele
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

Nucleation and Growth of Voids in Silicon

1997 ◽  
Vol 490 ◽  
Author(s):  
P. S. Plekhanov ◽  
U. M. Gösele ◽  
T. Y. Tan
Keyword(s):  
Void Growth ◽  
Homogeneous Nucleation ◽  
Nucleation And Growth ◽  
Vacancy Formation ◽  
Limited Time ◽  
Dislocation Loops ◽  
Nucleation Barrier ◽  
Different Temperatures ◽  
Type Dislocation ◽  
Growth Of Voids

ABSTRACTNucleation of voids and vacancy-type dislocation loops in Si under vacancy supersaturation conditions has been considered. Based upon nucleation barrier calculations, it has been found that voids can be nucleated, but not dislocation loops. The homogeneous nucleation rate of voids has been calculated for different temperatures by assuming different enthalpy values of Si vacancy formation. The process of void growth due to precipitation of vacancies has been numerically simulated. Comparing results of the nucleation and the growth modeling and taking into account the competition between the two processes, the limited time available, and the crystal cooling rate after growth, it has been shown that homogeneous nucleation of voids to experimentally observed densities and void growth to observed sizes is possible if enthalpy of Si vacancy formation is within the range of 2.9 to 3.6 eV with the nucleation temperature in the range of 980–1080 °C.

The nucleation and growth of voids at carbides in 9 Cr-1 Mo steel

1986 ◽  
Vol 34 (7) ◽  
pp. 1321-1327 ◽  
Author(s):  
B.A. Senior ◽  
F.W. Noble ◽  
B.L. Eyre
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

Nucleation and Growth of Voids in Quenched Aluminum

1966 ◽  
Vol 21 (11) ◽  
pp. 2291-2299 ◽  
Author(s):  
Michio Kiritani ◽  
Akikazu Sato ◽  
Sho Yoshida
Keyword(s):  
Nucleation And Growth ◽  
Growth Of Voids

The influence of the vacuum environment on the growth of electron irradiation induced voids

1978 ◽  
Vol 36 (1) ◽  
pp. 356-357
Author(s):  
J.T. Buswell ◽  
C. Baker ◽  
G.K. Rickards
Keyword(s):  
Electron Microscope ◽  
Total Dose ◽  
High Voltage ◽  
Electron Irradiation ◽  
Position Control ◽  
Nucleation And Growth ◽  
Voltage Electron ◽  
Void Swelling ◽  
High Voltage Electron Microscope ◽  
Growth Of Voids

The variability of the void swelling in nimonic alloy P.E.16 produced by electron irradiation in the high voltage electron microscope has indicated some influence of the vacuum environment on the nucleation and growth of voids.Specimens of double vacuum remelted nimonic alloy P.E.16 prepared under controlled conditions were preheated at 550°C for 1 hour in the microscope and then irradiated at temperature with 1 Mev electrons at a displacement rate of 2 x 10-3 per sec to a total dose of 10 - 20 displacements per atom.Measurement of the vacuum environment around the specimen was made with a Vacuum Generators Micromass 2A mass spectrometer fitted with a long sampling tube extending to within 10cm of the specimen position. Control of the specimen environment was achieved by bleeding in a chosen gas by way of a Leybold leak valve fixed into the side of the specimen chamber so as to introduce the gas to a point within 5cm of the specimen position and on the same plane.

A model of ductile fracture based on the nucleation and growth of voids

1981 ◽  
Vol 29 (8) ◽  
pp. 1509-1522 ◽  
Author(s):  
G. Le Roy ◽  
J.D. Embury ◽  
G. Edwards ◽  
M.F. Ashby
Keyword(s):  
Ductile Fracture ◽  
Nucleation And Growth ◽  
Growth Of Voids
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