Direct correlation between strengthening mechanisms and electrical noise in strained copper wires

Molecular-dynamics simulations of stacking-fault-induced dislocation annihilation in pre-strained ultrathin single-crystalline copper films

We report results of large-scale molecular-dynamics (MD) simulations of dynamic deformation under biaxial tensile strain of pre-strained single-crystalline nanometer-scale-thick face-centered cubic (fcc) copper films. Our results show that stacking faults, which are abundantly present in fcc metals, may play a significant role in the dissociation, cross-slip, and eventual annihilation of dislocations in small-volume structures of fcc metals. The underlying mechanisms are mediated by interactions within and between extended dislocations that lead to annihilation of Shockley partial dislocations…

Strengthening of copper by carbon nanotubes

The influence of a modifier based on multi walled carbon nanotubes (MWCNT) is investigated using C11000 copper alloy. The influence of the modifier addition into the melt was investigated using tensile test, hardness measurements, X-ray diffraction method and microstructural investigations. It was evaluated that the yield and tensile strengths of the metal increased due to the microstructural changes in the formed metal after addition of 0.01wt.% of the MWCNTs. It was also evaluated that the addition of mentioned amount of MWCNT into alloy has no influence to the phase composition of the forme…

镁、铝、铜和铁经剧烈塑性变形后 Hall-Petch 关系的断裂

Breaks in the Hall-Petch Relationship after Severe Plastic Deformation of Magnesium, Aluminum, Copper, and Iron

本研究考察了镁、铝、铜和铁经剧烈塑性变形后的 Hall-Petch 关系，发现晶粒细化至纳米级未必能实现额外强化，需结合偏析或析出等微观结构稳定化策略。