Neutron irradiation effects on thermally activated process of tensile properties of titanium.
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概要
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This paper deals with the relationship between mechanical properties and irradiatio. effeuts for titanium irradiated to fast neutron fluxes. The neutron fluences applied are 6.9×10<SUP>18</SUP>, 8.6×10<SUP>18</SUP> and 3.0×10<SUP>19</SUP> n/cm<SUP>2</SUP>. Tensile deformation is carried out over the tem-perature range of 77 about 600°K retaining the strain rate constant on one hand and changing the strain rate by a factor of about 5 and 10 on the other.<BR>The fluence (φ) dependence of the yield stress at room temperature for an athermal component of the stress, σ<SUB>μ</SUB> is greater than that for a thermal component σ<SUP>*</SUP> which does not change remarkably after irradiation. Their increments Δσ, Δσ<SUB>μ</SUB> and Δσ<SUP>*</SUP> are propor-tional to φ<SUP>1/3</SUP>, φ<SUP>1/2</SUP> and φ<SUP>1/4</SUP>, respectively.<BR>The relationship between activation volume V<SUP>*</SUP> and effective shear stress τ<SUP>*</SUP> is inves-tigated for both the unirradiated and irradiated specimens. In terms of the τ<SUP>*</SUP>/τ<SUP>*</SUP><SUB>0</SUB> analysis (τ<SUP>*</SUP><SUB>0</SUB> is the value of τ<SUP>*</SUP> at T=0°K), V<SUP>*</SUP> shows a tendency to decrease with increase in neutron fluence.<BR>Irradiation defects observable by electron microscopy seem to be related to the athermal activation stress (σ<SUB>u</SUB>) and those too small to be observed by electron microscopy to the thermal activation stress. The yield stress in the thermal activation can be given by Conrad's formula. The activation energy H<SUB>0</SUB> shows a constant value of about 1.8 eV irrespective of the neutron fluence applied. This value is 0.30.4 eV higher than that for unirradiated specimens.
- 一般社団法人 日本原子力学会の論文
著者
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Kayano Hideo
The Oarai Branch Institute For Materials Reseach Tohoku University
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Yajima Seishi
The Oarai Branch The Research Institute For Iron Steel And Other Metals Tohoku University
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HIGASHIGUCHI Yasuhiro
The Oarai Branch, The Research Institute for Iron, Steel and Other Metals, Tohoku University
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