Study of precipitate morphology by consideration of elastic strain energy

Technical Report · Mon Dec 01 04:00:00 EST 1980

OSTI ID:6575161

Wedge, D E

A formulation given by A.G. Khachaturyan for the elastic strain energy of a coherent second phase inclusion of arbitrary shape in an elastically anisotropic medium is used to calculate numerically the elastic energy for three different shapes - disk, lens, and ellipsoid - of ..cap alpha..'' (Fe/sub 16/N/sub 2/) particles in the Fe-N system, as a function of the particle aspect ratio. The results of the calculation are used to compute values for an isotropic interface energy ..gamma.., using experimental reports of particle dimensions. Two other elastic energy models are also used to compute ..gamma.., one from an analytical approximation by Khachaturyan, and one from the work of J.D. Eshelby. All these models are also used in conjunction with an anisotropic interface energy model to calculate values for the habit plane interface energy ..gamma../sub H/. The vaues for the interface energy are found to be much more consistent with the theory when the anisotropic model is used.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6575161
• Report Number(s): LBL-10639
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ANISOTROPY
COMPUTER CALCULATIONS
ENERGY
FREE ENERGY
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON NITRIDES
MORPHOLOGY
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
PRECIPITATION
SEPARATION PROCESSES
SURFACE ENERGY
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS