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CoCrFeNiMn high entropy alloy microstructure and mechanical properties after severe cold shape rolling and annealing

机译：COCRFENIMN高熵合金微观结构和力学性能轧制轧制和退火后

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A CoCrFeNiMn high entropy alloy (HFA) was processed by Severe Cold Shape Rolling (SCSR) to equivalent strain of 3.7 at room temperature. The processed alloy shows a single-phase CoCrFeNiMn HFA with an average grain size of ～50 nm and dislocation density of 2.1 x 10~(15) m~(-2). Heat treatment at 723-1223 K for up to 30 min was conducted to study microstructural evolution during short term post-deformation annealing (PDA). The results showed the maximum hardness of 527 Hv after PDA at 773 K due to formation of Cr-rich precipitates. PDA at 1223 K led to significant drop of the hardness value due to dissolution of precipitates, recrystallization and grain growth in the microstructure. The results suggested that formation of precipitates increased strength but reduced ductility significantly. Remarkable mechanical properties achieved after short-term PDA at 1023 K with an ultimate tensile strength of 1000 MPa, yield stress of 920 MPa and an elongation to failure of 20%.
机译：COCRFENIMN高熵合金（HFA）通过严重的冷形轧制（SCSR）加工到室温下的3.7的当量应变。加工合金显示单相COCRFENIMN HFA，平均晶粒尺寸为约50nm，位错密度为2.1×10〜（15）m〜（2）。进行723-1223K的热处理，最多30分钟，以研究短期变形退火（PDA）的短期内微观结构演化。由于形成Cr富含沉淀物，PDA在773K下的PDA后，结果表明了527HV的最大硬度。 PDA在1223 k下导致显着的硬度值，因为沉淀物，重结晶和微观结构的晶粒生长溶解。结果表明，沉淀物的形成增加强度但显着降低了延展性。在1023K的短期PDA下实现的显着机械性能，具有1000MPa的最终拉伸强度，屈服应力为920MPa，伸长率为20％。

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