Study by elastic theory of the clustering of solute atoms during the early stage of solid solution decomposition

Technical Report · Fri Sep 01 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6550206· OSTI ID:6550206

Hong, M

Khachaturyan's expression for the elastic strain energy of a coherent inclusion of arbitrary shape in an anisotropic medium is derived from both macroscopic theoretical approaches. This expression can be simplified for the case of a very thin disk-shaped inclusion, which enables one to calculate analytically the preferred orientations of Guinier--Preston (G.P.) zones in aluminum--copper alloys and carbide precipitates in iron--carbon martensite. The results are in good agreement with the experimental data. However, this thin-plate theory breaks down badly when it is applied to the case of thick-plate inclusions, such as the nitride precipitate (Fe/sub 16/N/sub 2/) in iron--nitrogen martensite. A method which takes the thickness effects into account was developed in order to solve this problem. The calculated minimun strain energy orientation of the disk-shaped nitride precipitate in iron--nitrogen martensite obtained with this method shows excellent agreement with experimental observation. 9 figures, 1 table.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6550206
• Report Number(s): LBL-7680
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
COPPER ALLOYS
CRYSTAL STRUCTURE
DISPERSIONS
ELASTICITY
GRAIN ORIENTATION
GUINIER-PRESTON ZONES
IRON ALLOYS
IRON COMPOUNDS
IRON NITRIDES
MARTENSITE
MECHANICAL PROPERTIES
MICROSTRUCTURE
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
ORIENTATION
PNICTIDES
PRECIPITATION
SEPARATION PROCESSES
SOLID SOLUTIONS
SOLUTIONS
STRAINS
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ZONES