Abstract
Molecular dynamics simulation method was used to study the influence of co-lattice twin boundary (TB) spacing on the deformation behavior of Al0.1CoCrFeNi high-entropy alloy single crystal under uniaxial tension. Studies have shown that there is a “critical distance” between the twin boundaries, and the sensitivity of the two sides to the change of the twin spacing is different, and the influence of the evolution of the deformation mechanism of the different twin spacing is analyzed from the number of defects and the evolution of the dislocation density. The results show that as the distance between twins decreases, the deformation mechanism gradually transforms from dislocation slip accompanied by defects, such as stacking faults and secondary twins, to a deformation mode of amorphous phase transition. The research aims to provide guidance and reference for the design of high-performance high-entropy alloys.
Highlights
High-entropy alloys (HEAs) are new types of alloys discovered in recent years and have attracted widespread attention from researchers because of their unique properties
Through the analysis of these two perspectives, we can further understand the competitive relationship between twins and dislocation sources in the yield behavior of nano-twin high-entropy alloys (nt-HEAs): when the twin spacing λ is less than 3.08 nm, the repulsive force of the twin boundary on the dislocation in the HEAs model yield behavior occupy the dominant position
Molecular dynamics simulation methods are used to study the mechanical behavior of nt-HEAs under tensile load, and the effect of the twin boundary distance λ on the mechanical properties and deformation mechanism of nt-HEAs is systematically analyzed
Summary
High-entropy alloys (HEAs) are new types of alloys discovered in recent years and have attracted widespread attention from researchers because of their unique properties. Li et al (2016) studied the mechanical behavior of AlCrFeCuNi high-entropy alloy under uniaxial tensile load using atomic simulation methods, and. Simulated the tensile behavior of AlCrCoFeCuNi amorphous alloys and explained the influence of Al content and strain rate effects on high-entropy alloys through free bulk modulus and cut band; Li et al (2019) used molecular dynamics simulation methods to study AlCoCrFeCuNi high-entropy alloys prepared under different cooling rates and deformation behaviors, which is very meaningful for guiding the control of the cooling rate and the high-strength high-entropy alloys; Grain boundaries are one of the inevitable important defects in metal materials. To further explore the deformation behavior and microstructure development of twins in Al0.1CoCrFeNi, this paper uses prefabricated Al0.1CoCrFeNi nano-twin high-entropy alloys (nt-HEAs) as a model material for related research
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