Atomic diffusion across Ni ₅₀ Ti ₅₀ —Cu explosive welding interface: Diffusion layer thickness and atomic concentration distribution

Abstract

Molecular dynamics simulations are carried out to study atomic diffusion in the explosive welding process of Ni 50 Ti 50 -Cu (at.%). By using a hybrid method which combines molecular dynamics simulation and classical diffusion theory, the thickness of the diffusion layer and the atomic concentration distribution across the welding interface are obtained.The results indicate that the concentration distribution curves at different times have a geometric similarity. According to the geometric similarity, the atomic concentration distribution at any time in explosive welding can be calculated. Ni 50 Ti 50 -Cu explosive welding and scanning electron microscope experiments are done to verify the results. The simulation results and the experimental results are in good agreement.

A Review on Molecular Dynamics Simulation of Joining Carbon-Nanotubes and Nanowires: Joining and Properties

“…Beside the in-situ method to investigate the properties of the nanomaterial that can be performed experimentally [6], MD simulation has shown its ability in the investigation of these properties. Some researchers have indicates that the data obtained by the MD simulation also have shown good agreement with the experimental works [82,83,94,95,[86][87][88][89][90][91][92][93]. Therefore, using MD simulation to investigate those properties is reasonable, either in its good agreement or to reduce the cost of research, and also there are broad ranges of techniques to make sure that the MD simulation performed is could be validated [96] to maintain its correctness.…”

Atomistic investigation on the effect of temperature on mechanical properties of diffusion-welded Aluminium-Nickel

“…The method of MD simulation is mainly built by the solution of the Newtonian equation of motion numerically which runs under a particular ensemble of atoms where can be used to investigate the material behaviors [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. In the application of diffusion welding, there are several investigations using MD simulation like, Chen et al when perform an investigation of diffusion bonding between Cu-Ag [5] and Cu-Al [6] which revealing the mechanism of diffusion bonding and shed light on the importance of pressure, temperature, and surface roughness on the process.…”

Atomic motion behavior calculation and bonding mechanism analysis of explosive welding of high-strength and high-hardness titanium alloy Ti6Al4V/aluminum alloy 7075

“…The paper [31] comprehensively analyzed the enormous application prospects of molecular dynamics in the field of connectivity. Yong Ma [32] used molecular dynamics to discover the atomic diffusion behavior in the explosive welding process, and SY Chen [33] and Feng [34] used molecular dynamics algorithm to discuss the distribution of the thickness of the element diffusion layer and the atomic concentration. Numerical calculation has become an important means to study explosive welding technology, which is of great significance to understand and analyze explosive welding process.…”

“…Explosive welding is widely accepted as a solid phase metallurgical technology, relying on the atomic gravity of two materials at the interface to form a solid metallurgical bond. However, due to the physical performance of high temperature and high pressure at the interface in the process of explosive welding, in addition to the solid phase bonding of interface atoms, many scholars still have a big dispute about whether pressure welding and fusion welding occur in the process of explosive welding [33,35].…”