Effect of solute atom gradient segregation structure and twin spacing on mechanical properties of nanotwin Cu-Ag alloy

QY Tang and F Zhang and YR Zhi and FT Li and DY Wang and L Yang, JOURNAL OF NANOPARTICLE RESEARCH, 25, 192 (2023).

DOI: 10.1007/s11051-023-05842-y

Using the molecular dynamics simulation method, nanoindentation simulation was carried out on a variety of nanotwin Cu-Ag alloys with different gradient distribution structures and twin spacing to study the mechanical properties and deformation mechanism of nanotwin Cu-Ag alloys with a grain size of 15 nm. The deformation, failure process, and microstructure evolution of the model during extrusion were defined and analyzed by means of common neighbor analysis (CNA) and dislocation analysis (DXA), and the micro-mechanism of twin spacing and solute atom gradient segregation structure affecting the mechanical properties of nanotwin Cu-Ag alloy was revealed. The results show that different solute atom gradient segregation structures and twin spacing have important effects on the mechanical properties of nanotwin Cu-Ag alloy. Dislocations and stacking faults are more likely to occur within grains with thicker solute concentrations and larger twin boundary spacing.

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