Effect of boron on tensile properties of B2 FeAl

Technical Report · Sat Feb 01 04:00:00 EST 1986

OSTI ID:6073081

Crimp, M; Vedula, K

Small additions of boron improve the room temperature ductility of Ni/sub 3/Al, possibly owing to B segregation to grain boundaries. This study was undertaken to see if boron has a similar effect on the low temperature tensile properties of FeAl. A binary alloy without boron is compared with an alloy containing 0.78 at % B (0.2 wt %), by tensile testing over the temperature range of 300 to 640/sup 0/K. Both alloys were processed by powder metallurgy. Results showed that 0.78 at % B addition to FeAl does indeed change the room temperature fracture mode from intergranular to transgranular, suggesting a strengthening of grain boundaries. The alloy containing boron is, however, still brittle at room temperature. A slight decrease in the ductile to brittle transition temperature is, nevertheless, observed. In addition a significant increase in strength of the alloy is observed with boron addition.

• Research Organization: Case Western Reserve Univ., Cleveland, OH (USA)
• DOE Contract Number: AI01-77CS51040
• OSTI ID: 6073081
• Report Number(s): DOE/NASA-0563-1; NASA-CR-175074; ON: TI86008577
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSCOPY
MICROSTRUCTURE
TENSILE PROPERTIES