Abstract
FeCo is a B2 intermetallic compound which undergoes an order-disorder transformation. In this paper, the effects of changes in both constitutional and thermal disorder on the room temperature fracture of FeCo are presented. Tensile tests were performed on three compositions of FeCo, Fe[sub 30]CO[sub 70], Fe[sub 50]CO[sub 50] and Fe[sub 70]CO[sub 30]. The resulting fracture surfaces were examined by SEM and the grain boundary chemistry was investigated by Auger electron spectroscopy, AES. Ordered Fe[sub 50]CO[sub 50] and Fe[sub 70]CO[sub 30] were very battle, fracture occurring before yielding, with intergranular fracture occurring in most grains. In contrast, ordered Fe[sub 30]CO[sub 70] showed about 18% elongation and exhibited a dimple-type fracture. It was also found that disordering improved the ductility of each composition but had little influence on the fracture mode. AES showed that a low level of sulfur segregation was present at the grain boundaries, suggesting that sulfur segregation alone was not responsible for the brittle behavior of the ordered alloys.
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