Role of coherency in the elastic behavior of composition-modulated superlattices

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346164· OSTI ID:6226341

Jaszczak, J A; Phillpot, S R; Wolf, D ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)

We investigate the role of coherency in the elastic behavior of composition-modulated superlattices of fcc metals by atomistic computer simulations using Lennard--Jones potentials. Structures, energies, and elastic properties of incoherent superlattices are computed as a function of the compositional modulation wavelength along (001) and compared with those of coherent superlattices. Both superlattice types were taken to have a 10% lattice parameter mismatch between the two materials. The incoherent superlattices, as compared to coherent superlattices, were found to be more structurally disordered and exhibited greater elastic anomalies, which cannot be accounted for by the overall dimensional changes of the superlattices alone. High- and low-frequency elastic constants are briefly compared. It is proposed that increasing the structural disorder in the superlattices by increasing the lattice-parameter mismatch or by introducing a relative rotation between the two materials will enhance all of the elastic anomalies even further.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6226341
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHEMICAL COMPOSITION
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELASTICITY
ELEMENTS
FCC LATTICES
FREQUENCY DEPENDENCE
LATTICE PARAMETERS
LENNARD-JONES POTENTIAL
MECHANICAL PROPERTIES
METALS
MODULATION
POTENTIALS
SIMULATION
SUPERLATTICES
TENSILE PROPERTIES