Abstract FeCoNi concentrated solid-solution alloys (CSAs) and its modified version strengthened by in-situ formed nano-sized particles are successfully manufactured through mechanical alloying and spark plasma sintering method. Both the as-milled powders and the bulk materials are of single face-centered cubic structure. After sintering and heat treatment, grains are refined by 68% with the addition of oxides. In oxide dispersion strengthened (ODS) FeCoNi CSAs, the majority of nano-sized particles with diameter ranging from a few to ~ 40 nm are uniformly distributed in the matrix, and most of them are identified as Y2Ti2O7. Electron backscattered diffraction results reveal that the recrystallization process is suppressed due to the existence of the nano-sized particles. The size and distribution of oxide particles in the matrix can be controlled by adjusting experiment parameters of the mechanical alloying process and annealing treatment. Refined grains and high-density nano-sized particles result in enhanced compressive yield strength for ODS-FeCoNi CSAs at room temperature and 700 °C, which is 1295 MPa and 127 MPa, respectively.

中文翻译：

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机械合金化合成氧化物弥散强化FeCoNi浓固溶体合金

摘要 通过机械合金化和放电等离子烧结法成功制备了FeCoNi浓缩固溶体合金（CSA）及其原位形成纳米颗粒强化的改性版本。研磨后的粉末和块状材料均具有单面心立方结构。烧结和热处理后，由于添加了氧化物，晶粒细化了 68%。在氧化物弥散强化 (ODS) FeCoNi CSA 中，大多数直径从几个到 ~ 40 nm 的纳米级颗粒均匀分布在基体中，其中大部分被识别为 Y2Ti2O7。电子背散射衍射结果表明纳米颗粒的存在抑制了再结晶过程。可以通过调整机械合金化工艺和退火处理的实验参数来控制基体中氧化物颗粒的大小和分布。细化晶粒和高密度纳米级颗粒提高了 ODS-FeCoNi CSA 在室温和 700 °C 下的压缩屈服强度，分别为 1295 MPa 和 127 MPa。