Morphology and crystallography of Cr precipitates in a Cu-0. 33wt% Cr alloy
- Lawrence Berkeley Lab., CA (United States). Materials Sciences Division
Lath-shaped, faceted Cr-rich precipitates in a Cu-0.33wt%Cr alloy were investigated by transmission electron microscopy. Their orientation relationship with the matrix was identical for all precipitates observed. One set of close-packed planes in the two phases were exactly parallel, with the close packed directions enclosing an angle of 0.5[degree], a systematic deviation of 0.5[degree] from the Kurdjumov-Sachs orientation relationship, or 5.76[degree] from Nishiyama-Wassermann. The lath axis was aligned precisely with the [[bar 5]6[bar 1]][sub f] invariant line direction, located at the intersection of the close-packed planes (111)[sub f][parallel](110)[sub b] with the cone of unextended lines. In a agreement with previous observations the dominant interface facet was found to be (3.1 3.5 5.5)[sub f] or [approximately]2[degree] away from (335)[sub f]. All crystallographic measurements were in excellent agreement with the predictions of an invariant line strain model assuming the Bain correspondence and a pair of parallel close packed planes, but inconsistent with the theory of martensitic transformations.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7175609
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:6; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Interface structure of faceted lath-shaped Cr precipitates in a Cu-0.33 wt% Cr alloy
Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHROMIUM
CHROMIUM ALLOYS
COPPER ALLOYS
COPPER BASE ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
DATA
ELEMENTS
EXPERIMENTAL DATA
GRAIN ORIENTATION
INFORMATION
METALS
MICROSTRUCTURE
MORPHOLOGY
NUMERICAL DATA
ORIENTATION
PHASE TRANSFORMATIONS
PRECIPITATION
SEPARATION PROCESSES
TRANSITION ELEMENTS