Kinetics of Shock-Induced Phase Transitions.
WASHINGTON STATE UNIV PULLMAN SHOCK DYNAMICS LAB
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Possible practical effects of phase transitions in structural materials are discussed and a rationale is developed for investigating the kinetics of transitions induced by shock waves. A gas gun experiment in two-dimensional steady plane flow is described. Atomic motions required for transition from the NaCl form of KCl to the CsCl lattice are described in detail. Some experiments with KCl which were intended to relate ease of transition to atomic motions are described. They suggest that those transitions involving minimal motions may occur most rapidly, but they are not conclusive. They also show evidence of thermal-activated diffusion at 85C. Effects of shear stress on the equilibrium of two phases are discussed for a very simple case and are shown to be sensitive to shear stress. A more general formulation shows that conditions for phase equilibrium, even without surface energies, can differ markedly for equality of the simple Gibbs functions. An extensive bibliography is appended.
- Physical Chemistry
- Solid State Physics