Effect of boron on tensile properties of B2 FeAl
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
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Related Subjects
ALUMINIUM ALLOYS
TENSILE PROPERTIES
BORON ADDITIONS
METALLURGICAL EFFECTS
IRON ALLOYS
ELECTRON MICROSCOPY
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
ALLOYS
BORON ALLOYS
CRYSTAL STRUCTURE
MICROSCOPY
360103* - Metals & Alloys- Mechanical Properties