Observations of grain boundary sliding during superplastic deformation

Journal Article · Fri Jul 01 04:00:00 EDT 1983 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02664829· OSTI ID:6537055

Rai, G; Grant, N J

Flat specimens of 10-micron grain size A1-33 pct Cu alloy were deformed in air over a range of strains at 450/sup 0/C (723 K) and at 10/sup -5/ strain per second. Observations were also made in a SEM during superplastic deformation of a 5-micron Pb-Sn eutectic alloy at room temperature at a strain rate of about 10/sup -5/s/sup -1/ (grain boundary sliding was noted. Microcreep curves between initially adjacent) grains showed that deformation is cyclical in nature and varies by several orders of magnitude from point to point. Surface grains change neighbors many times, rotation and tilt, little change in size or shape, yet intergranular cracking. Superplastic deformation not unlike that observed in the creep of conventional types of alloys in the extent of plastic deformation free of intergranular cracking, combined with recovery in the form of boundary migration.

• Research Organization: Dept. of Materials Science and Eng., Massachusetts Inst. of Technology, Cambridge, MA
• OSTI ID: 6537055
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 14A:7; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AIR
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
COPPER ALLOYS
CRACK PROPAGATION
CREEP
CRYSTAL STRUCTURE
DEFORMATION
ELECTRON MICROSCOPY
EUTECTICS
FLUIDS
GASES
GRAIN BOUNDARIES
GRAIN SIZE
HIGH TEMPERATURE
INCIDENCE ANGLE
LEAD ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MOTION
PLASTICITY
ROTATION
SCANNING ELECTRON MICROSCOPY
SHAPE
SIZE
STRAIN RATE
TIN ALLOYS