Intrinsic response of crystals to pure dilatation

Conference · Tue Dec 31 04:00:00 EST 1991

OSTI ID:10161272

Wang, Jinghan; Yip, S ^[1]; Phillpot, S; Wolf, D ^[2]

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1. Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Nuclear Engineering
2. Argonne National Lab., IL (United States)

The response of an f.c.c. lattice with Lennard-Jones interaction under symmetric lattice extension has been studied by Monte Carlo simulation at several temperatures. The critical strain at which the crystal undergoes a structural change is found to be well predicted by the mechanical stability limit expressed in terms of either the elastic constants or the bulk modulus. At low temperature (reduced temperature T = 0.125), lattice decohesion is observed in the form of cleavage fracture, whereas at higher temperature (T = 0.3) the strained system deforms by cavitation with some degree of local plasticity. At still higher temperature (T = 0.5) the lattice undergoes homogeneous disordering with all the attendant characteristics of melting.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10161272
• Report Number(s): ANL/CP--76452; CONF-911003--27; ON: DE92016780
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102
COMPUTERIZED SIMULATION
CRYSTAL-PHASE TRANSFORMATIONS
DEFORMATION
FCC LATTICES
INTERMETALLIC COMPOUNDS
MONTE CARLO METHOD
PLASTICITY
STRAINS
STRUCTURE AND PHASE STUDIES