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Temperature dependence of mechanical properties, deformation behavior, and fracture micromechanisms in multicomponent CoCrNi and (CoCrNi)99.5С0.5 alloys
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DOI：10.1016/j.msea.2026.150902.png)
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Abstract
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In this paper, we investigate the influence of carbon alloying on deformation behavior of CoCrNi alloy at different temperatures. We focus on tensile mechanical properties, strain hardening, and deformation mechanisms of specimens in the temperature range from 77 to 297 K. Within this temperature interval, carbon-alloying increases the yield strength of the alloy. In low-temperature deformation region, the temperature dependence of the yield strength of the alloy (CoCrNi)99.5C0.5 is stronger than in carbon-free alloy: the slope on the σ0.2(T)-dependencies is higher in (CoCrNi)99.5С0.5 specimens. Dislocation slip and mechanical twinning are dominaiting deformation mechanisms in CoCrNi and (CoCrNi)99.5C0.5 alloys both at 77K and room temperature. Carbon alloying assists formation of a more planar dislocation arrangement and provides significantly higher strain hardening in (CoCrNi)99.5C0.5 specimens compared to the complex "slip + twinning" mechanism in interstitial-free CoCrNi alloy. Elongation to failure is a temperature-independent characteristic of both alloys. It is insignificantly lower in carbon-alloying specimens: about 80% in CoCrNi alloy and about 70% in (CoCrNi)99.5C0.5. The ductile dimple fracture mode is characteristic of the CoCrNi alloy regardless of the test temperature. A ductile transcrystalline fracture and brittle secondary cracking along grain boundaries are typical of C-alloyed specimens. This is evidence of planar-slip-assisted grain boundary decohesion during the plastic deformation of (CoCrNi)99.5C0.5 alloy and/or possible carbon microsegregation at grain boundaries.
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