Deformation behaviour of Cu-Zr/Al composites based on molecular dynamics simulation
Effect of Zr content on tensile deformation behavior of Cu/Al layered composites was studied using molecular dynamics simulation method.Cu in Cu/Al layered composites was replaced by Zr through substitution doping,with substitution ratios of 0.25％,0.45％,0.65％,0.85％and 1.05％,respectively.The results show that with the increase of Zr substitution ratios,the ultimate tensile strength and maximum tensile strain of the Cu-Zr/Al composites exhibit a fluctuating trend.When the substitution ratio of Zr is 0.85％,the ultimate tensile strength and maximum tensile strain of the composites are maximum.Continuing to increase the content of Zr will reduce both the ultimate tensile strength and maximum tensile strain.As the strain increases,the FCC structure,BCC structure,and HCP structure undergo mutual transformation.When tensile along the Y-axis,the initial phase structure transformation becomes more pronounced.With the increase of Zr substitution ratios,the crystal transformation of the composites during plastic deformation will be delayed.Shockley incomplete dislocations play a dominant role in the plastic deformation process,and the length of the dislocation line when tensile along the Y-axis is greater than that when tensile along the Z-axis.At the same time,the addition of Zr element affects the diffusion of dislocations,leading to a decrease in dislocation density of the composites and an increase in its strength.
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