Oxide dispersion strengthened (ODS) FeCrAl alloys have been considered as the promising candidate fuel cladding materials for the Gen-IV fission reactors due to excellent radiation tolerance, mechanical properties and corrosion resistance, but their manufacturing is complex process. Laser engineered net shaped (LENS) technology followed by post-build heat treatment was employed successfully to fabricate Zr-containing ODS-FeCrAl alloy. The microstructure of as-deposited and heat-treated alloys was characterized by optical microscope (OM), electron backscatter diffraction (EBSD), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM). The tensile tests were carried out at room temperature. The results show that the coarse columnar grains with preferred orientation ([001] fibre texture) are obtained after LENS deposit and are remained after post-build heat treatment. The average width of columnar grains for both as-deposited and heat-treated samples is ∼180–190 μm. A slag-like layer which is made up of Y₃Al₅O₁₂, ZrO₂ and Al₂O₃ is observed at the surface of deposited sample. Some coarse appendage oxides which consist of Al₂O₃ and Y₄Zr₃O₁₂ are distributed in the matrix of as-deposited sample. Post-build heat treatment produces high-density nanoscale Y₄Zr₃O₁₂ oxides in the matrix. The formation mechanism of different type oxides is explained. Both as-deposited and heat-treated samples present anisotropic tensile properties. After post-build heat treatment, the tensile strength is improved significantly by the formation of high-density nanoscale Y₄Zr₃O₁₂.

氧化物弥散强化（ODS）FeCrAl合金由于具有出色的耐辐射性，机械性能和耐蚀性，因此被认为是第四代裂变反应堆的有希望的候选燃料包覆材料，但它们的制造工艺复杂。成功地采用激光工程网状（LENS）技术，然后进行后加工热处理，以制造含Zr的ODS-FeCrAl合金。通过光学显微镜（OM），电子背散射衍射（EBSD），扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）对沉积和热处理合金的微观结构进行了表征。拉伸试验在室温下进行。结果表明，在LENS沉积后获得具有优选取向（[001]纤维织构）的粗柱状晶粒，并在后热处理后保留。沉积和热处理样品的柱状晶粒平均宽度约为180-190μm。由Y组成的渣状层在沉积样品的表面观察到₃ Al ₅ O ₁₂，ZrO ₂和Al ₂ O ₃。一些由Al ₂ O ₃和Y ₄ Zr ₃ O ₁₂组成的粗附氧化物分布在沉积后的样品基体中。建置后热处理可产生高密度纳米级Y ₄ Zr ₃ O ₁₂基质中的氧化物。说明了不同类型氧化物的形成机理。沉积样品和热处理样品均具有各向异性拉伸性能。在构建后的热处理之后，通过形成高密度的纳米级Y ₄ Zr ₃ O _12可以显着提高拉伸强度。