Effect of cold-rolling and annealing temperature on microstructure, texture evolution and mechanical properties of FeCoCrNiMn high-entropy alloy

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-16 DOI:10.1016/j.jmrt.2024.09.124
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Abstract

This study investigates the effects of cold rolling and annealing on the microstructure, texture, and mechanical properties of FeCoCrNiMn high-entropy alloys. Utilizing vacuum induction melting, the alloy was initially cast into ingots and hot-rolled into plates, which were subsequently cold-rolled to various thicknesses and annealed at different temperatures. Microstructural analyses were conducted using X-ray diffraction and electron backscatter diffraction techniques, revealing a persistent face-centered cubic structure across all conditions. The texture evolution demonstrated a shift from Copper and S components to dominant Goss and Brass components as cold rolling intensified, suggesting the formation of Brass-type texture in FeCoCrNiMn at high deformation. Mechanical testing showed that the alloy's yield and tensile strengths significantly increased with cold rolling, reaching optimum values at ∼66 % reduction. Annealing at 750 °C enhanced both strength and ductility, primarily through grain refinement and the formation of Σ3 annealing twin boundaries, which dominated the microstructure of recrystallized grains. The study confirms that the low stacking fault energy of the alloy facilitates the activation of twinning and transformation-induced plasticity mechanisms, crucial for the observed enhancements in mechanical properties.

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冷轧和退火温度对铁钴铬镍锰高熵合金显微组织、纹理演变和力学性能的影响
本研究探讨了冷轧和退火对铁钴铬镍锰高熵合金的微观结构、质地和机械性能的影响。利用真空感应熔炼,合金最初被铸成锭,然后热轧成板,再冷轧成不同厚度,并在不同温度下退火。利用 X 射线衍射和电子反向散射衍射技术对合金进行了微观结构分析,结果表明在所有条件下合金都具有持续的面心立方结构。纹理演变表明,随着冷轧的加剧,铜和 S 成分逐渐转变为主要的 Goss 和黄铜成分,这表明在高变形下铁钴铬镍锰合金中形成了黄铜型纹理。机械测试表明,随着冷轧的进行,合金的屈服强度和抗拉强度显著提高,在减薄 ∼ 66 % 时达到最佳值。750 °C退火主要通过晶粒细化和形成Σ3退火孪晶界来提高强度和延展性,Σ3退火孪晶界在再结晶晶粒的微观结构中占主导地位。研究证实,合金的低堆积断层能有利于激活孪晶和转变诱导的塑性机制,这对观察到的机械性能增强至关重要。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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