On the lattice correspondence of the delta. -->. cap alpha. displacive transformation in plutonium alloys

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(84)90462-9· OSTI ID:6463950

Olson, G B; Adler, P H

Although the low temperature delta ..-->.. ..cap alpha.. transformation which occurs on cooling or deformation of Pu alloys exhibits many of the characteristics of a martensitic transformation, classification of the transformation according to recent taxonomy) and elucidation of its crystallographic characteristics have been hampered by the lack of a clear correspondence and lattice deformation relating the FCC delta and monoclinic ..cap alpha.. structures. The transformation represents an interesting test case of crystallographic concepts due to its unusually large volume contraction of app. 20%. A correspondence was proposed by Lomer (and the associated lattice deformation described by Spriet, but these are found to be inconsistent with experimental evidence that the delta ..-->.. ..cap alpha.. lattice deformation involves a contraction normal to the (020) /SUB la/ basal plane, based on the crystallographic texture of ..cap alpha.. produced from delta by uniaxial compressive deformation. The authors explore possible lattice correspondences consistent with this contraction, and examine the classification of this transformation based on characteristics of associated lattice deformations.

• Research Organization: Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
• OSTI ID: 6463950
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 18:4; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ACTINIDE ALLOYS
ALLOYS
CARBON ADDITIONS
COOLING
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
IRON ALLOYS
MARTENSITE
MONOCLINIC LATTICES
PHASE TRANSFORMATIONS
PLUTONIUM ALLOYS
TEXTURE