Effects of Nitrogen on the Plasticity of Co-Rich Complex Concentrated Alloys

Introducing interstitial elements in complex concentrated alloys (CCAs) has received considerable attention due to its effectiveness in changing plasticity mechanisms, resulting in superior mechanical properties. However, fundamental investigation of the effects of interstitial elements is challenging because of the complex chemical interactions among interstitial elements, substitutional elements, and defects. Here, we present the effects of dilute nitrogen on defect evolution in Co-rich complex concentrated alloys with low (negative) stacking fault energies. We will systematically discuss the possible effects of nitrogen: solute pinning, short-range ordering or clustering, stacking fault energies, and segregation.