Copyright Prof. Paulo R. Rios

Grain boundary, triple junction and quadruple point mobility controlled normal grain growth

 

Grain boundaries, triple junctions, and quadruple points are geometrical elements comprising polycrystalline networks, where these elements have co-dimensions 1, 2, and 3, respectively, and control grain volumes in 3-D. For most materials, with "large" grain sizes, grain boundary mobility usually controls network kinetics. Nonetheless, there are a few papers published to date concerning the effects of grain network elements on the self-similar distributions for scaled grain size and number of faces per grain. Our study applies a polyhedral representation of grains that the authors developed to obtain self-similar LSW-like behavior, with distributions for the three limiting situations: where boundary, triple junction, or quadruple point mobility dominates the kinetics of network evolution. The self-similar states obtained yield important implications concerning details of polycrystalline evolution, such as grain growth “trajectories”, including grain lifetimes and their time-volume behavior. Key results are discussed in detail.

 

Work done in cooperation with Martin E. Glicksman, College of Engineering, Florida Institute of Technology, Melbourne, FL, USA

Furthermore Prof. Rios was a visiting scientist at MPIE for 3 month, sponsored by the Alexander von Humboldt Foundation through a Return Humboldt Scholarship.

Prof. Paulo R. Rios

Escola de Engenharia Industrial Metalúrgica de Volta Redonda, Universidade Federal

Fluminense, Volta Redonda, Rio de Janeiro, Brazil

Go to Editor View