Observation of the habit-plane shift and the morphology of. cap alpha. '' nitride (Fe/sub 16/N/sub 2/) precipitate in. cap alpha. -Fe

Technical Report · Tue Jun 01 04:00:00 EDT 1982

OSTI ID:6806374

Shih, Y C

The habit plane shift phenomenon of ..cap alpha..'' nitride (Fe/sub 16/N/sub 2/) precipitate in ..cap alpha..-Fe is discovered by TEM observation. The habit plane of ..cap alpha..'' precipitate shifts from (100) toward (102). The angular shift increases as the precipitate grows. Also, the angular shift increases as the aspect ratio of ..cap alpha..'' particle increased. This relation has been predicted by considering the finite thickness effect on Khachaturyan's elastic theory. The crystal structure of the habit shifted precipitate is found to be distorted from a tetragonal structure, the structure of the initial ..cap alpha..'' precipitate. The real morphology of ..cap alpha..'' precipitate at the early stage is revealed as a rosette pattern on (001) habit plane. The branches of the rosette point in <100> and <110> directions. The possible reasons for the rosette morphology are discussed.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6806374
• Report Number(s): LBL-14284; ON: DE82022054
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
CRYSTAL STRUCTURE
ELEMENTS
IRON
IRON COMPOUNDS
IRON NITRIDES
METALS
NITRIDES
NITROGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS