Author: C. E. Coleman
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author:
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Category : Nuclear energy
Languages : en
Pages :

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Author: RB. Adamson
Publisher:
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Category : Crack initiation
Languages : en
Pages : 17

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The onset of plastic instability in irradiated materials is known to be governed by deformation processes that occur on a microscopic scale. In order to identify the nature of the controlling mechanisms giving rise to plastic instability, details of the deformation processes were examined for Zircaloy-2 irradiated to fluences of 1.0 to 3.0 x 1021 neutrons (n)/cm2 (E >1 MeV) and tested in inert and 0.3-torr iodine atmospheres at 322 ~ 335°C. For irradiated materials tested in air, it was shown that plastic strain at the maximum load decreased by more than an order of magnitude relative to unirradiated material, especially under plane-stress conditions. This was due largely to concentrated shear deformation resulting from dislocation channel development. When the similar materials were tested in iodine, the load-carrying capacity was reduced further. Based on the evidence obtained by metallographic examination, a model has been proposed describing deformation behavior of irradiated plane-stress specimens by assuming consecutive formation and strain hardening of new deformation zones containing channels. Crack nucleation under an iodine atmosphere is believed to occur when the local strain at the channel zone becomes sufficiently large to break oxide films and cause intergranular cracking.

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Category : Aeronautics
Languages : en
Pages : 1502

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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Category : Metallurgy
Languages : en
Pages : 812

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Author: Arden Lee Bement (Jr.)
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Category : Metallurgy
Languages : en
Pages : 214

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Author: Atomic Energy of Canada Limited
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ISBN:
Category :
Languages : en
Pages : 5

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Author: A. L. Bement
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Category : Zirconium-tin alloys
Languages : en
Pages : 416

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Author: W. B. Rotsey
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ISBN:
Category : Cold working
Languages : en
Pages : 16

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The strain-aging behavior of annealed Zircaloy-2 in vacuum was studied as a function of deformation temperature, integrated fast-neutron dose, and degree of cold work. Strain aging occurred in the temperature range 200 to 500 C. Transmission electron microscopy showed that in the temperature range 300 to 450 C, dislocations were arranged in a cell structure, and that at 500 C two-dimensional hexagonal dislocation nets were present. Between 200 and 400 C, the strain aging was found to be due to the presence of oxygen; however, the origin of the strain aging between 400 and 500 C was not identified.

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Category : Nuclear reactors
Languages : en
Pages : 954

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