Kinematics of delta. -->. cap alpha. and. cap alpha. -->. delta martensitic transformation in plutonium alloys

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(86)90264-6· OSTI ID:7006206

Adler, P H; Olson, G B; Margolies, D S

Determination of invariant-plane-strain crystallographic solutions for martensitic transformation between the f.c.c. delta and monoclinic ..cap alpha.. phases in plutonium alloys, using three possible lattice correspondences and 53 possible lattice-invariant shear systems, identifies the most probable delta-..cap alpha.. lattice correspondence. The operative lattice-invariant shear systems are predicted by comparison of both shape strain magnitudes and computed interfacial energies. For the delta -- ..cap alpha.. transformation, twinning on (001)(100)/sub chi/ is favored, giving a (0.817, 0.538, 0.208)/sub delta/ habit and a (0.947, 0.269, 0.174/sub delta/) shape strain of magnitude m/sub 1/ = 0.324. The ..cap alpha.. ..-->.. delta transformation favors slip on (111)(101)/sub delta/ giving a (0.255, 0.844, 0.471)/sub chi/ habit and (0.822, 0.446, 0355)/sub chi/ shape strain of magnitude m/sub 1/ = 0.417. Consideration of the independence of crystallographic solutions as deformation modes indicates that deformation of the monoclinic ..cap alpha.. phase via ..cap alpha.. ..-->.. delta transformation plasticity will require the operation of more than one lattice correspondence, and will likely require additional deformation mechanisms to provide a sufficient number of independent deformation systems to accommodate an arbitrary shape deformation.

• Research Organization: Chemistry and Materials Science Dept., Lawrence Livermore National Lab., Livermore, CA (US)
• OSTI ID: 7006206
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 34:10; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ACTINIDE ALLOYS
ALLOYS
CARBON ADDITIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CUBIC LATTICES
DEFORMATION
FCC LATTICES
IRON ALLOYS
MARTENSITE
MECHANICAL PROPERTIES
MONOCLINIC LATTICES
PHASE TRANSFORMATIONS
PLASTICITY
PLUTONIUM ALLOYS
SLIP