Ni composites were reinforced with ultrafine and uniform TiC_x and Cr₃C₂ particles in situ via reactive pressure sintering using 15 vol%Ti₂AlC, 15 vol%Cr₂AlC, Ni powders. An improved powder preparation process through high-energy ball milling and freeze drying was adopted. Ultrafine TiC_x or Cr₃C₂ particles (about 200 nm) were combined with about 320 nm Ni grains within a uniform microstructure. Considering the matrix grains, intragranular nanoscale TiC_x and Cr₃C₂ were found in Ni grains, with a dispersed distribution of γ′-Ni₃(Al,Ti) nanospheres. The interface between Ni and TiC_x was semicoherent, whereas Cr₃C₂ and Ni had a well-matched interface. Ni composites dispersedly strengthened by in situ uniformly distributed TiC_x and Cr₃C₂ with a high ceramic fraction of about 15 vol% possess noticeable 1.378 GPa yield strength. This strategy can be used to design ultrafine, uniform, high-performance composites for structural application.

_{使用 15 vol%Ti 2} AlC、15 vol%Cr ₂ AlC、Ni 粉末通过反应压力烧结，用超细且均匀的 TiC _x和 Cr ₃ C ₂颗粒原位增强 Ni 复合材料。采用改进的高能球磨和冷冻干燥制粉工艺。超细 TiC _x或 Cr ₃ C ₂颗粒（约 200 nm）与约 320 nm 的 Ni 晶粒在均匀的微观结构中结合。考虑到基体晶粒，在Ni晶粒中发现了晶内纳米级TiC _x和Cr ₃ C ₂，γ′-Ni _{3分散分布}(Al,Ti) 纳米球。Ni和TiC _x之间的界面是半共格的，而Cr ₃ C ₂和Ni具有良好匹配的界面。通过原位均匀分布的TiC _x和Cr ₃ C ₂分散强化的Ni复合材料具有约15 vol%的高陶瓷分数，具有显着的1.378 GPa屈服强度。该策略可用于设计用于结构应用的超细、均匀、高性能复合材料。