Generalized melting criterion for amorphization. [NiZr, NiZr[sub 2], NiTi, FeTi]

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

OSTI ID:6774079

Devanathan, R ^[1]; Lam, N Q; Okamoto, P R ^[2]; Meshii, M ^[3]

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1. Argonne National Lab., IL (United States) Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
2. Argonne National Lab., IL (United States)
3. 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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6774079
• Report Number(s): ANL/MSD/CP-76615; CONF-921101--59; ON: DE93005557; CNN: DMR-8802847
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
AMORPHOUS STATE
BEAMS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELASTICITY
ELECTRON BEAMS
FRENKEL DEFECTS
IRON ALLOYS
LEPTON BEAMS
MECHANICAL PROPERTIES
MELTING
NICKEL ALLOYS
PARTICLE BEAMS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
SHEAR
TENSILE PROPERTIES
THERMODYNAMICS
TITANIUM ALLOYS
VACANCIES
ZIRCONIUM ALLOYS