论文标题
测量离子植入的SIC中肿胀诱导的残余应力及其对微力特性的影响
Measurement of swelling-induced residual stress in ion implanted SiC, and its effect on micromechanical properties
论文作者
论文摘要
离子植入被广泛用作替代材料特性的辐射损伤研究中的中子照射。由于损坏的深度很小，因此必须使用微机械方法来提取材料特性。在这项工作中，纳米凹陷已应用于离子辐照碳化硅以提取辐射诱导的硬化。使用HR-EBSD，AFM膨胀测量值以及一种新型的微型抗体弛豫技术以及有限元建模来评估残余应力。在辐照材料中发现了几个GPA的大型压缩应力，这有助于在纳米识别测量中观察到的明显硬化。这些残留应力和相关硬化的起源是限制辐射肿胀的未辐照底物。与其他容易受辐射肿胀的材料的比较表明，在研究离子辐照损伤对机械性能的影响时不应忽略这种作用。该约束也可能影响基本辐射缺陷。这对离子植入作为中子辐照的替代物具有重要意义。这些结果证明了肿胀诱导的残留应力在核反应堆成分中的重要性，以及对反应器成分结构完整性的影响。
Ion implantation is widely used as a surrogate for neutron irradiation in the investigation of radiation damage on the properties of materials. Due to the small depth of damage, micromechanical methods must be used to extract material properties. In this work, nanoindentation has been applied to ion irradiated silicon carbide to extract radiation-induced hardening. Residual stress is evaluated using HR-EBSD, AFM swelling measurements, and a novel microcantilever relaxation technique coupled with finite element modelling. Large compressive residual stresses of several GPa are found in the irradiated material, which contribute to the significant hardening observed in nanoindentation measurements. The origin of these residual stresses and the associated hardening is the unirradiated substrate which constrains radiation swelling. Comparisons with other materials susceptible to irradiation swelling show that this effect should not be neglected in studying the effects of ion irradiation damage on mechanical properties. This constraint may also be influencing fundamental radiation defects. This has significant implications for the suitability of ion implantation as a surrogate for neutron irradiations. These results demonstrate the significance of swelling-induced residual stresses in nuclear reactor components, and the impact on structural integrity of reactor components.
