Simultaneously improving strength and corrosion resistance of CoCrNi-based multi-principal element alloys via alloying with Mo content
Source abstract
Abstract
CoCrNi multi-principal element alloy (MPEA) has gained increasing interest due to its good mechanical properties and corrosion resistance. To further improve its strength and corrosion resistance, this study designed novel (CoCrNi) 100-xMo x (x = 0, 1, 2, 3, 4, at%) MPEAs, with a primary focus on the influences of Mo addition on their microstructures, mechanical properties, and corrosion behaviors of the MPEAs. Microstructural characterizations showed that with the increase in Mo content from 0 to 4, the microstructures of (CoCrNi) 100-xMo x MPEAs gradually transformed from FCC single-phase to FCC & σ dual-phase structure, along with the formation of dendrites. Mechanical testing results exhibited increased strength of the MPEAs with Mo element increasing, which is due to solid solution strengthening and precipitation strengthening. Furthermore, corrosion testing results at 3.5 wt% NaCl solution revealed that the corrosion current density of the (CoCrNi) 100-xMo x MPEAs firstly decreased and then increased with increasing Mo content from 0 to 4. Among them, (CoCrNi) 97Mo 3 MPEA demonstrated the best corrosion resistance, surpassing most conventionally corrosion-resistant Titanium alloys and MPEAs. This is due to its single-phase structure, which prevents galvanic coupling corrosion, and the addition of minor Mo, which promotes Cr 2O 3 formation in the passivation film.
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Research context
OpenAlex topics: High Entropy Alloys Studies · High-Temperature Coating Behaviors · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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