Effects of Grain Size on the Diffusion Activation Energy and Melting Point

Abstract

A thermodynamic method based on bonding energy and surface thermodynamics was developed to accurately investigate the diffusion activation energy and melting point of metallic nanomaterials. The results indicated that the diffusion activation energy, melting point of metallic nanomaterials follow an approximate inverse proportional relationship with the nanosize. Furthermore, the self-diffusion activation energy and melting point of Au, Cu, and the inter-diffusion activation energy of Fe nanomaterials were validated, the experimental results agree well with our theoretical model. This method provided a new approach to evaluate the diffusion activation energy and melting point of nanomaterials.