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首页> 外文会议>STP 1467; International Symposium on Zirconium in the Nuclear Industry; 20040613-17; Stockholm(SE) >Plastic Deformation of Irradiated Zirconium Alloys: TEM Investigations and Micro-Mechanical Modeling
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Plastic Deformation of Irradiated Zirconium Alloys: TEM Investigations and Micro-Mechanical Modeling

机译：辐照锆合金的塑性变形：TEM研究和微机械建模

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TEM investigations have been performed on irradiated samples after deformation covering various testing conditions for different recrystallized Zr alloys. It is shown that for transverse tensile tests and internal pressure tests performed at 350℃, only basal channels are observed for strain levels up to uniform elongation, whereas only prismatic and pyramidal channels are observed for axial tensile test. Then, focusing on internal pressure testing, irradiation hardening and strain hardening behavior have been analyzed in detail and compared to TEM observations. It is proposed that dislocation channeling phenomenon leads to high strain incompatibility between channels and surrounding grains and therefore to high microscopic internal stresses. These high microscopic internal stresses are believed to induce strong kinematic hardening at the macroscopic scale, as suggested by the mechanical behavior analysis. Finally, a micro-mechanical model based on microscopic deformation mechanisms and using homogenization techniques is proposed, taking into account the observed channeling phenomenon.
机译：对变形后的辐照样品进行了TEM研究，涵盖了针对不同重结晶Zr合金的各种测试条件。结果表明，在350℃下进行的横向拉伸试验和内压试验中，仅观察到基底通道的应变水平达到均匀伸长，而仅观察到棱形和金字塔形通道进行轴向拉伸试验。然后，针对内压测试，已对辐射硬化和应变硬化行为进行了详细分析，并与TEM观察结果进行了比较。提出位错沟道现象导致沟道与周围晶粒之间的高应变不相容性，并因此导致高的微观内应力。如机械行为分析所暗示的，据信这些高微观内部应力在宏观尺度上引起强烈的运动硬化。最后，考虑到所观察到的窜流现象，提出了一种基于微观变形机制并使用均质化技术的微机械模型。

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