Two-step crystal growth mechanism during crystallization of an undercooled Ni50Al50 alloy.

ABSTRACT: Crystallization processes are always accompanied by the emergence of multiple intermediate states, of which the structures and transition dynamics are far from clarity, since it is difficult to experimentally observe the microscopic pathway. To insight the structural evolution and the crystallization dynamics, we perform large-scale molecular dynamics simulations to investigate the time-dependent crystallization behavior of the NiAl intermetallic upon rapid solidification. The simulation results reveal that the crystallization process occurs via a two-step growth mechanism, involving the formation of initial non-equilibrium long range order (NLRO) regions and of the subsequent equilibrium long range order (ELRO) regions. The formation of the NLRO regions makes the grains rather inhomogeneo

SUBMITTER: An S 

PROVIDER: S-EPMC4971477 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature