FeCoNi showed a positive special boundary increment with grain growth, while CoCrFeNi showed a negative trend and CoCrFeMnNi exhibited a constant value.
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Effect of one-step recrystallization on the grain boundary evolution of CoCrFeMnNi high entropy alloy and its subsystems.
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The sentences
However, the special boundary fraction showed a decreasing trend during grain growth, which indicates that Σ3 annihilation occurs for CoCrFeNi.
The Σ9 boundary fraction showed an increasing trend during grain growth, much higher than that of CoCrFeMnNi and CoCrFeNi, due to the increased frequency of Σ3 regeneration.