Effect of aluminum level on boron clustering in Ni/sub 3/Al

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6231600

Horton, J A; Miller, M K; Liu, C T; George, E P; Bentley, J

In alloys containing 0.24% boron, atom-probe field-ion microscopy (APFIM) revealed the presence of boron clusters in Ni-25 at. % Al and Ni-26 Al but not in Ni-24 Al. The observed boron clusters generally consisted of two to three boron atoms with a maximum size of 10 atoms. Quench rates that ranged from rapid solidification to furnace cooling had little effect on the clustering. The occurrence of the clustering coincides with a higher rate of boron strengthening as measured by an increase in the yield stress per atomic percent boron, and it also coincides with a reduced amount of boron segregation to grain boundaries. The levels of nickel and boron were highly variable on grain boundaries in rapidly solidified material and therefore no consistent indication of nickel enrichment at the grain boundaries associated with boron segregation was found. This result suggests that cosegregation of nickel with boron may not be necessary for the ductilization of Ni/sub 3/Al by boron, since the rapidly solidified material is also ductilized by boron and exhibits segregation of only boron to the grain boundaries. 24 refs., 5 figs., 3 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6231600
• Report Number(s): CONF-881155-49; ON: DE89007837
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DUCTILITY
ELECTRON MICROSCOPY
ELEMENTS
GRAIN BOUNDARIES
HARDNESS
INTERMETALLIC COMPOUNDS
ION MICROSCOPY
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
POINT DEFECTS
ROUGHNESS
SEGREGATION
SURFACE PROPERTIES
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES