A Modeling Study of Cyclical Phase Transformations
|Periodical||Materials Science Forum (Volumes 475 - 479)|
|Edited by||Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie|
|Citation||Jong K. Lee, 2005, Materials Science Forum, 475-479, 3081|
|Online since||January, 2005|
|Authors||Jong K. Lee|
|Keywords||Free Energy Change, Mechanical Alloying (MA), Phase Transformation|
Recent work has shown evidence of cyclical phase transformations taking place during mechanical alloying. Cyclical phase transformations resemble dynamic equilibrium in the sense that both equilibrium and non-equilibrium phases are simultaneously present during milling, but phase fractions vary during cyclical transformations. A brief thermodynamic and kinetic account is first discussed to establish the criteria for cyclical transformations. A two-dimensional molecular dynamic work is then presented to demonstrate cyclical phase transitions between an equilibrium and a non-equilibrium phase during mechanical alloying. A model binary crystal made of 57 Lennard-Jones atoms is studied to illustrate cyclical transitions between an equilibrium rhombus and a non-equilibrium square phase.