The room‐temperature tensile strength, toughness, and high‐temperature creep strength of 2000, 6000, and 7000 series aluminum alloys can be improved significantly by dispersing up to 1 wt% carbon nanotubes (CNTs) into the alloys without sacrificing tensile ductility, electrical conductivity, or thermal conductivity. CNTs act like forest dislocations, except mobile dislocations cannot annihilate with them. Dislocations cannot climb over 1D CNTs unlike 0D dispersoids/precipitates. Also, unlike 2D grain boundaries, even if some debonding happens along 1D CNT/alloy interface, it will be less damaging because fracture intrinsically favors 2D percolating flaws. Good intragranular dispersion of these 1D strengtheners is critical for comprehensive enhancement of composite properties, which entails change of wetting properties and encapsulation of CNTs inside Al grains via surface diffusion‐driven cold welding. In situ transmission electron microscopy demonstrates liquid‐like envelopment of CNTs into Al nanoparticles by cold welding.

中文翻译：

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碳纳米管的晶内分散全面改善铝合金

通过将不超过1 wt％的碳纳米管（CNT）分散到合金中，可以在不牺牲拉伸延展性，电学性能的情况下显着提高2000、6000和7000系列铝合金的室温拉伸强度，韧性和高温蠕变强度。电导率或热导率。碳纳米管的行为就像森林的错位，只是移动性的错位无法消除它们。位错不能爬过1D CNT，这与0D弥散体/沉淀不同。而且，与2D晶界不同，即使沿1D CNT /合金界面发生一些剥离，其破坏性也较小，因为断裂本质上有利于2D渗漏缺陷。这些一维增强剂的良好颗粒内分散性对于全面增强复合材料的性能至关重要，这需要通过表面扩散驱动的冷焊来改变润湿性并改变铝晶粒内部碳纳米管的封装。原位透射电子显微镜显示通过冷焊将液态碳纳米管包裹到铝纳米颗粒中。