کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447267 988640 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intergranular δ-hydride nucleation and orientation in zirconium alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Intergranular δ-hydride nucleation and orientation in zirconium alloys
چکیده انگلیسی

A theoretical understanding of the intergranular δ-hydrides is still lacking, although hydride-related degradation of the mechanical properties of zirconium alloys has been studied for many years. In this paper a thermodynamic model is developed to analyze the nucleation and orientation of intergranular δ-hydrides. The results show that the grain boundary structure and zirconium grain orientation simultaneously govern hydride precipitation. An electron backscatter diffraction study of hydrided Zircaloy-4 provides direct evidence supporting theoretical predictions. A criterion is proposed to reveal the inherent relation between hydride precipitation at the grain boundaries and in the zirconium grains. Stress-induced susceptibility to hydride precipitation at the radial grain boundaries of zirconium alloy tubes is theoretically analyzed. This work provides a general framework based on which the correlation between the grain boundary structure, the grain orientation, the stress and their effects on the nucleation and orientation of the intergranular δ-hydrides can be clarified.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 18, October 2011, Pages 7010–7021
نویسندگان
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