Microstructure evolution and plastic deformation of Ni47Co53 alloy under tension

To investigate microstructural evolution and plastic deformation under tension, the rapid solidification processes of the Ni47Co53 alloy are first simulated by molecular dynamics methods at cooling rates of 10(11), 10(12) and 10(13) K s(-1). Then, the uniaxial tension simulation study was conducted on a single crystal, polycrystal and metallic glass, which were formed during the rapid solidification. The results show that the dislocation loops evolution in the crystal is caused by the slips and proliferation of stacking faults, and in terms of plastic deformation, the single crystal is carried by stacking faults, while a polycrystal is carried by grain boundaries. A metallic glass formed at the critical cooling rate and crystallized under tension, the plastic deformation is carried by grain boundaries and stacking faults in metallic glass. Ultimately, the stacking faults are the most resistant to plastic deformation. This study has great significance for the study of the mechanical properties of single crystals, polycrystals and metallic glass.

Automated summary

The study investigates the microstructural evolution and plastic deformation under tension by simulating the rapid solidification processes of Ni47Co53 alloy and conducting uniaxial tension simulation on single crystal, polycrystal, and metallic glass. It reveals that dislocation loops evolution in crystals is caused by slips and proliferation of stacking faults, while plastic deformation in metallic glass is mainly carried by grain boundaries and stacking faults. Ultimately, stacking faults are found to be most resistant to plastic deformation.