Misfit strain-induced shape transformations of the gamma{prime}-phase in model Ni-base alloys

Conference · Fri Dec 30 23:00:00 EST 1994

OSTI ID:72408

Faehrmann, M; Faehrmann, E ^[1]; Fratzl, P; Paris, O ^[2]; Johnson, W C ^[3]

---

1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
2. Univ. of Vienna (Austria). Inst. Solid State Physics
3. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

The influence of the magnitude and sign of the misfit strain on shape evolution of the coherent {gamma}{prime} phase in a series of Ni-Al-Mo alloys during coarsening is examined using TEM and SAXS. Misfit strains at aging temperature were determined by x-ray diffraction. Symmetry-conserving, sphere-to-cube transitions and symmetry-breaking cube-to-cuboid transitions with increasing particle size are observed. Both particle shape transitions occur at smaller particle sizes the larger the magnitude of the misfit strain, independent to first order of its sign. Particle alignment was also found to depend upon the magnitude of misfit strain.

• DOE Contract Number: FG02-84ER45166
• OSTI ID: 72408
• Report Number(s): CONF-9310224--; ISBN 0-87339-249-3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALUMINIUM ALLOYS
HEAT TREATMENTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL BASE ALLOYS
PARTICLES
PHASE STUDIES
PRECIPITATION
SHAPE
SMALL ANGLE SCATTERING
STRAINS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION