Microstructures and Tensile Properties of Fe-40Al Intermetallic with High Boron Content
The effects of B addition up to 0.4 wt% (i.e., 1.61 at%) to Fe-40Al alloy on microstructures and tensile properties were investigated. The vacancy-annealed specimens following casting and extrusion were examined by optical and scanning electron microscopy and thermal neutron-induced microradiography. The addition of a large amount of B resulted in grain refinement and changed the fracture mode from intergranular to transgranular to increase the tensile elongation. Especially, the alloy containing 0.3wt% B exhibited the elongation of 16.4% under the strain rate of 1x100s-1 at room temperature. The increase in elongation with increasing strain rate was discussed in terms of suppression of hydrogen embrittlement.
Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee
J. H. Lee et al., "Microstructures and Tensile Properties of Fe-40Al Intermetallic with High Boron Content", Materials Science Forum, Vols. 510-511, pp. 350-353, 2006