Generalized melting criterion for amorphization

Conference · Tue Dec 01 04:00:00 EST 1992

OSTI ID:10120347

Devanathan, R ^[1]; Lam, N Q; Okamoto, P R ^[1]; Meshii, M ^[2]

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1. Argonne National Lab., IL (United States)
2. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

We present a thermodynamic model of solid-state amorphization based on a generalization of the well-known Lindemann criterion. The original Lindemann criterion proposes that melting occurs when the root-mean-square amplitude of thermal displacement exceeds a critical value. This criterion can be generalized to include solid-state amorphization by taking into account the static displacements. In an effort to verify the generalized melting criterion, we have performed molecular dynamics simulations of radiation-induced amorphization in NiZr, NiZr{sub 2}, NiTi and FeTi using embedded-atom potentials. The average shear elastic constant G was calculated as a function of the total mean-square atomic displacement following random atom-exchanges and introduction of Frenkel pairs. Results provide strong support for the generalized melting criterion.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10120347
• Report Number(s): ANL/MSD/CP--76615; CONF-921101--59; ON: DE93005557; CNN: Grant DMR-8802847
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106
AMORPHOUS STATE
ELASTICITY
ELECTRON BEAMS
FRENKEL DEFECTS
IRON ALLOYS
MELTING
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SHEAR
THERMODYNAMICS
TITANIUM ALLOYS
ZIRCONIUM ALLOYS