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Failure Analysis in FeCo Magnetic Alloys through Electron Channeling Contrast Imaging Defect Characterization

FeCo based alloys have gained interest for applications such as solenoids, transformers, motors, and generators. This is because these alloys have demonstrated desirable magnetic properties with heat treatment. However, FeCo alloys tend to fracture readily, and the exact mechanisms behind this brittleness remain elusive. The brittle properties are thought to be related to the γ-FCC → α-BCC→ α 2 (B 2 ) phase transformation that equiatomic or near-equiatomic Fe-Co alloys undergo when cooling from higher temperatures. It has been hypothesized that this process can lead to anti-phase boundaries in the ordered phase which could promote fracture. Here, we investigate structural defects in FeCo alloys and their role in fracture.