|About this Abstract
||Materials Science & Technology 2012
||Phase Stability, Diffusion, Kinetics and their Applications (PSDK-VII)
||Investigation of Nucleation Mechanisms for Intergranular Complexion Transitions and Abnormal Grain Growth by Monte Carlo Modeling
||William Edward Frazier, Anthony D Rollett, Gregory S Rohrer
|On-Site Speaker (Planned)
||William Edward Frazier
We seek to deepen our understanding of intergranular complexion (IC) nucleation mechanisms by exploring the relationship between IC transitions and abnormal grain growth (AGG) in metals and ceramics. It is known that IC transitions spawn AGG, whose effects on bulk mechanical properties like toughness, strength and creep may be either advantageous or detrimental. For this reason, an improved understanding of IC transition kinetics is requisite to control microstructure by tailored processing. To this end, Monte Carlo modeling was used to simulate grain growth in doped aluminas, assuming either a site saturated nucleation or continuous nucleation mechanism of ICs on grain boundaries leading to AGG. The predicted grain size distributions (GSD’s) obtained from these simulations were compared to observed GSDs of doped aluminas. Grain growth kinetics and number densities of abnormal grains were also compared between the model and experiments.