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An Atom Probe Field Ion Microscope Investigation Of The Role Of Boron In Precipitates And At Grain Boundaries In NiAl

Conference · · Materials Research Society Symposia Proceedings
DOI:https://doi.org/10.1557/proc-238-445· OSTI ID:10110011
 [1];  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
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The high resolution analytical technique of Atom Probe Field Ion Microscopy (APFTM) haseen used to characterize grain boundaries and the matrix of a stoichiometric NiAl alloy doped with 0.04 (100 wppm) and 0.12 at. % (300 wppm) boron. Field ion images revealed boron segregation to the grain boundaries. Atom probe elemental analysis of the grain boundaries measured a boron coverage of up to 30% of a monolayer. Extensive atom probe analyses also revealed a fine dispersion of nanoscale boride precipitates in the matrix. The boron segregation to the grain boundaries was found to correlate with the observed suppression of intergranular fracture. However, the decrease in ductility of boron-doped NiAl is attributed in part to the precipitation hardening effect of the boride phases.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
10110011
Report Number(s):
CONF-911202--13; ON: DE92005102
Conference Information:
Journal Name: Materials Research Society Symposia Proceedings Journal Volume: 238
Country of Publication:
United States
Language:
English

References (8)

The Atom‐Probe Field Ion Microscope journal January 1968
Room temperature tensile ductility in polycrystalline B2 NiAl journal January 1989
Effect of boron on grain-boundaries in Ni3Al† journal February 1985
Improvement in Room Temperature Ductility of the L12 Type Intermetallic Compound Ni3Al by Boron Addition [Ll2型金属間化合物Ni3Alのホウ素添加による常温延性の改善] journal January 1979
Atom probe analysis of grain boundaries in rapidly-solidified Ni3Al journal January 1987
Brittle fracture and grain boundary chemistry of microalloyed NiAl journal April 1990
An atom probe field ion microscope study of boron decorated boundaries in Ni3Al journal May 1986
The colloidal nature of phospholipid monolayers journal January 1987

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Related Subjects

36 MATERIALS SCIENCE
360102
360103
ALUMINIUM ALLOYS
BORON
DUCTILITY
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
ION MICROSCOPY
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NICKEL ALLOYS
STRUCTURE AND PHASE STUDIES