Role of severe plastic deformation on mechanical behavior of irradiated materials: A case study with Nb-1Zr alloy

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2024-10-29 DOI:10.1016/j.jnucmat.2024.155487

S. Mondal , M. Sen , S.K. Makineni , P. Ghosh , A. Sarkar , R. Kapoor , S. Suwas

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引用次数: 0

Abstract

In this investigation, the effect of 5.6 MeV proton irradiation on the microstructure and mechanical properties of coarse grained (CG) and nanocrystalline (NC) Nb-1wt.%Zr (NZ) has been analysed. Bulk nanocrystalline microstructure was obtained by subjecting the alloy to room temperature high pressure torsion under 6 GPa hydrostatic pressure and 5 rotations. The CG and NC samples were irradiated at doses of 1.9 × 10¹⁷ p/cm² and 1.8 × 10¹⁷ p/cm², respectively. Microstructural parameters like crystallite size, dislocation density, and dislocation arrangements were studied in detail using X-ray line profile analysis (XLPA) by Convolutional Multiple Whole Profile (CMWP) fitting. Microscopic observations were made with electron microscopy techniques in the scanning and transmission modes. Differential Scanning Calorimetry (DSC) was performed to estimate the concentration of vacancies after HPT processing and irradiation. Tensile tests of irradiated CG and NC irradiated samples were performed and compared to those in unirradiated conditions. In the NC condition, not only did the irradiated sample show higher ultimate tensile strength but also twice the amount of uniform elongation as compared to the irradiated CG sample. The fracture surface clearly exhibited this higher plasticity post-irradiation in the NC samples. The change in deformation mechanisms due to nano-structuring of the microstructure has been anticipated to be a reason for the increase in ductility in a single-phase alloy has been explained thereafter.

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严重塑性变形对辐照材料力学行为的影响：Nb-1Zr 合金案例研究

本研究分析了 5.6 MeV 质子辐照对粗晶粒 (CG) 和纳米晶 (NC) Nb-1wt.%Zr (NZ) 显微结构和机械性能的影响。在 6 GPa 静水压力和 5 次旋转条件下对合金进行室温高压扭转，获得了块状纳米晶微观结构。CG 和 NC 样品的辐照剂量分别为 1.9 × 1017 p/cm2 和 1.8 × 1017 p/cm2。利用 X 射线轮廓分析法（XLPA）和卷积多重整体轮廓拟合法（CMWP）详细研究了结晶尺寸、位错密度和位错排列等微观结构参数。显微镜观察是通过扫描和透射模式下的电子显微镜技术进行的。差示扫描量热法（DSC）用于估算 HPT 加工和辐照后的空位浓度。对经过辐照的 CG 和 NC 样品进行了拉伸试验，并与未经过辐照的样品进行了比较。在 NC 条件下，辐照样品不仅显示出更高的极限拉伸强度，而且均匀伸长率也是辐照 CG 样品的两倍。在 NC 样品中，断裂面明显表现出辐照后更高的塑性。由于微观结构的纳米化而导致的变形机制变化被认为是单相合金延展性增加的原因，下文对此进行了解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.