Study on Microstructural Evolution, Strengthening and Deformation Mechanisms of a CoCrNi-Based Medium-Entropy Alloy with Different Annealing Times
Pu Zhang, Chunjiang Zhao, Ruirui Wang, Yongping Liu, Yongan Chen
TL;DR
This study explores how different annealing times affect the microstructure and strength of a CoCrNi-based alloy, revealing how these changes influence mechanical properties.
Contribution
The study provides new insights into how controlled annealing times can tailor the microstructure and deformation mechanisms of multi-phase medium-entropy alloys.
Findings
Prolonged annealing promotes partial recrystallization and intragranular γ′ precipitates.
Extended annealing increases elongation while slightly reducing yield strength.
Deformation is dominated by planar slip with stacking faults, enhancing work-hardening.
Abstract
This study systematically investigates the influence of annealing time on the microstructure and mechanical properties of a (CoCrNi)93.5Al3Ti3C0.5 medium-entropy alloy. Following hot-rolling, the alloy was subjected to annealing treatments at 900 °C for 10 min (HA900-10) and 60 min (HA900-60). Microstructural characterization revealed that both alloys contained three types of precipitates: intergranular M23C6 and MC-type carbides, as well as γ′ phase. The HA900-10 specimen exhibited a low degree of recrystallization, whereas prolonged annealing promoted partial recrystallization, leading to the formation of a slightly heterogeneous structure (HA900-60). Additionally, the extended annealing facilitated the intragranular precipitation of nanoscale γ′ phase. Room-temperature tensile tests demonstrated that the HA900-10 and HA900-60 specimens achieved yield strengths of 1276 MPa and 1202…
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Taxonomy
TopicsHigh Entropy Alloys Studies · Additive Manufacturing Materials and Processes · Magnesium Alloys: Properties and Applications