The relationship between different ball milling (BM) conditions and mechanical properties of CNT/Al composites was studied through tailoring grain interior/grain boundary affected zone (GI/GBAZ). The ultrafine-grained (UFGed) architectures of the CNT/Al composites made from flake powders with the same thickness under different BM conditions, introduce different strain rates and vary dislocation density. The results showed that the grain size of CNT/Al composite were significantly influenced by milling conditions, which caused obvious variations in mechanical properties. The enhancing in tensile properties of CNT/Al composite mostly caused by grain refinement, dislocation strengthening, and back stress hardening, which last two terms are closely linked to GBAZ thickness. The simulated results agreed well with experimental results, confirming a strain rate dependency of GBAZ thickness. This work strengthened the understanding of ball milling process on the microstructure and mechanical properties of metal matrix composites.

通过调整晶粒内部/晶界影响区（GI/GBAZ），研究了不同球磨（BM）条件与CNT/Al复合材料力学性能之间的关系。由具有相同厚度的片状粉末在不同 BM 条件下制成的 CNT/Al 复合材料的超细晶 (UFGed) 结构引入了不同的应变率和不同的位错密度。结果表明，CNT/Al复合材料的晶粒尺寸受球磨条件的显着影响，导致力学性能明显变化。CNT/Al 复合材料拉伸性能的提高主要是由晶粒细化、位错强化和背应力硬化引起的，后两项与 GBAZ 厚度密切相关。模拟结果与实验结果吻合良好，确认 GBAZ 厚度的应变率依赖性。该工作加强了球磨工艺对金属基复合材料微观结构和力学性能的理解。