Creep-induced local lattice parameter changes in a monocrystalline nickel-based superalloy

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02661741· OSTI ID:5448652

Mughrabi, H; Biermann, H ^[1]; Ungar, T ^[2]

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1. Univ. Erlangen--Nuernberg, Erlangen (Germany)
2. Eoetvoes Univ., Budapest (Hungary). Inst. for General Physics

The [gamma]-[gamma][prime] lattice mismatch of specimens of the monocrystalline nickel-base superalloy SRR 99 has been measured by a high-resolution X-ray diffraction technique for the undeformed state and after high-temperature creep deformation. During creep deformation beyond the minimum creep rate (total strain [approximately]0.5%), the lattice mismatches, measured in and perpendicular to the [001] stress axis, respectively, undergo changes in opposite directions. This reflects the buildup of a complex deformation-induced triaxial state of internal stress in the phases [gamma] and [gamma][prime]. The overall resolved shear stresses that act in [gamma][prime] and [gamma] due to the combined action of the external and internal stresses are estimated, and the conditions under which cutting of the [gamma][prime] phase by dislocations should occur are discussed.

• OSTI ID: 5448652
• Journal Information: Journal of Materials Engineering and Performance; (United States), Journal Name: Journal of Materials Engineering and Performance; (United States) Vol. 2:4; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
DATA
EXPERIMENTAL DATA
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
LATTICE PARAMETERS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA