Advances in molecular dynamics research of microvoid evolution
Microvoids are commonly observed in advanced metal materials such as nickel-based single crystal superalloys,special steels,titanium alloys,cast aluminum alloys,and 3D printed polycrystalline metal materials.Due to the lack of mechanistic understanding of microvoids evolution and damage,the influence of microvoids on material properties has not yet been unified.The important reason is that it is difficult to obtain various physical fields such as stress,strain,and energy by experimental means.Molecular dynamics simulation(MD)can provide intuitive dynamic evolution information from the details of atomic motion,is often used to study the influence of microvoids aggregation on the mechanical properties of materials,providing a theoretical basis for the design and performance regulation of advanced materials.Through the quantitative processing of physical quantities such as energy,atomic stress,and strain obtained by MD calculations,the physical essence of microvoids evolution can be provided for larger-scale calculation.This article focuses on the application of MD simulation in the microvoids evolution of advanced materials.Starting from the current research status at home and abroad,the current research hot spots and key conclusions are summarized,and some problems existing in current MD simulation are analyzed.The development trend of related research in the future is prospected.
万方数据
维普
