尚智坚,王文琴,朱训,王德,陈云霞,裴星淇,黄伟,陈吉根,徐永东.电阻缝焊滚压对AlCoCrFeNi2.1共晶高熵合金微观组织及力学性能的影响机制[J].表面技术,2025,54(11):195-202.
SHANG Zhijian,WANG Wenqin,ZHU Xun,WANG De,CHEN Yunxia,PEI Xingqi,HUANG Wei,CHEN Jigen,XU Yongdong.Effects of Resistance Seam Welding and Rolling on Microstructure and Mechanical Properties of AlCoCrFeNi2.1 Eutectic High-entropy Alloy[J].Surface Technology,2025,54(11):195-202 |
| 电阻缝焊滚压对AlCoCrFeNi2.1共晶高熵合金微观组织及力学性能的影响机制 |
| Effects of Resistance Seam Welding and Rolling on Microstructure and Mechanical Properties of AlCoCrFeNi2.1 Eutectic High-entropy Alloy |
| 投稿时间：2024-11-05 修订日期：2025-04-07 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.11.016 |
| 中文关键词: 电阻缝焊滚压 HDI硬化 磨损率 力学性能 |
| 英文关键词:resistance seam welding and rolling HDI hardening wear rate mechanical property |
| 基金项目:国家自然科学基金(52461021, 52205375) |
| 作者 | 单位 |
| 尚智坚 | 南昌大学 先进制造学院，南昌 330031 |
| 王文琴 | 南昌大学 先进制造学院，南昌 330031 |
| 朱训 | 南昌大学 先进制造学院，南昌 330031 |
| 王德 | 南昌航空大学 航空制造工程学院，南昌 330063 |
| 陈云霞 | 上海第二工业大学 智能制造与控制工程学院，上海 201209 |
| 裴星淇 | 南昌大学 先进制造学院，南昌 330031 |
| 黄伟 | 南昌大学 先进制造学院，南昌 330031 |
| 陈吉根 | 南昌大学 先进制造学院，南昌 330031 |
| 徐永东 | 南昌大学 先进制造学院，南昌 330031 |
|
| Author | Institution |
| SHANG Zhijian | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| WANG Wenqin | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| ZHU Xun | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| WANG De | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China |
| CHEN Yunxia | School of Intelligent Manufacturing and Control Engineering, Shanghai Polytechnic University, Shanghai 201209, China |
| PEI Xingqi | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| HUANG Wei | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| CHEN Jigen | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
| XU Yongdong | School of Advanced Manufacturing, Nanchang University, Nanchang 330031, China |
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| 中文摘要: |
| 目的 探究电阻缝焊滚压后处理工艺对铸态AlCoCrFeNi2.1共晶高熵合金(Eutectic high entropy alloy，EHEA)微观组织和力学性能的影响。方法 使用电阻缝焊设备对铸态试样进行表面滚压处理，通过X射线衍射仪、扫描电镜表征电阻缝焊滚压前后物相的变化、组织转变、元素分布趋势。使用维氏硬度计、原位拉压试验机、往复摩擦磨损试验机分析合金表面硬度、强塑性、耐磨性能的变化。结果 经滚压处理后，合金维持FCC和BCC的双相结构，但存在共晶片层结构被FCC相取代的现象，FCC相的含量增加，共晶相片层间距缩小了25.8%。合金的力学性能显著增强，屈服强度、抗拉强度和伸长率分别从741.83 MPa、1 011.63 MPa、17.86%提高至966.87 MPa、1 343.24 MPa、28.81%，断裂模式由韧脆混合型转变为韧性断裂。经滚压后，合金的平均硬度由264.3HV提升至331.4HV，平均摩擦因数(Friction coefficient, COF)从0.549 4降至0.514 8，磨损机制为磨粒磨损和分散化的氧化磨损。结论 在滚压过程中，压力和电脉冲两大效应(热效应和非热效应)的耦合作用促进了异质变形诱导(Heterogeneous deformation induced，HDI)硬化，增大了长程背应力和正向应力。由电阻缝焊滚压引起的加工硬化，由电脉冲的非热效应造成的表面氧化磨损分散化都促进了合金耐磨性能的提升。 |
| 英文摘要: |
| This study explores the effects of resistance seam welding and rolling on the microstructure and mechanical properties of AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA), aiming to enhance its comprehensive mechanical properties. Optimal rolling parameters are identified via orthogonal experiments at a welding current of 3000 A, a welding speed of 1 mm/s for 10 rolling passes. Specimens in both as-cast and rolled conditions are prepared for detailed analysis. The phase composition and surface microstructure of the alloy before and after rolling are comparatively analyzed by means of an X-ray diffractometer (XRD), a field emission scanning electron microscope (SEM) and an energy dispersive spectrometer (EDS). The results show that after the rolling treatment, the alloy still maintains a dual-phase structure of body-centered cubic (BCC) and face-centered cubic (FCC). However, the non-thermal effect of the electrical pulse during the rolling process promotes the diffusion of elements, leading to a decrease in the content of Al, which is a stabilizer of the BCC phase, and thus promoting the transformation of the BCC phase into the FCC phase. Meanwhile, the thermal effect of the electrical pulse causes the alloy to soften, and in combination with the rolling pressure, it refines the grains and reduces the lamellar spacing of the eutectic phase by 25.8%. The hardness test results show that the surface hardness of the as-cast specimen is 264.3HV, and it increases by 25.4% after the rolling treatment. The friction and wear performance test indicates that after the rolling treatment, the average coefficient of friction (COF) of the specimen decreases from 0.549 4 to 0.514 8, and the average wear rate also decreases from 2.74×10−6 mm³/(N.m) to 2.32×10−6 mm³/(N.m). The rolled specimen exhibits superior wear resistance. The wear analysis shows that the wear mechanisms of the as-cast specimen under the action of the ZrO2 grinding ball are mainly abrasive wear and oxidative wear. The non-thermal effect of the pulse current during the rolling process homogenizes the element diffusion, forming a dispersed oxide film, which reduces the direct contact between the grinding ball and the specimen. Together with the work hardening caused by rolling, it improves the wear resistance, which is consistent with the decrease in the friction coefficient and average wear rate. The tensile test results show that the yield strength, tensile strength and elongation of the as-cast alloy are 741.83 MPa, 1 011.63 MPa and 17.86% respectively. After the rolling treatment, the yield strength increases to 966.87 MPa, the tensile strength increases to 1 343.24 MPa, and the elongation increases to 28.81%, which are 30.34%, 32.78% and 61.31% higher than those of the as-cast alloy respectively. The fracture mode also changes from a mixed ductile-brittle fracture of the as-cast specimen to a single ductile fracture. The synergistic improvement of strength and toughness mainly stems from the coupling effect of the pressure and the electrical pulse (thermal and non-thermal effects) during the rolling process, which promotes the Heterogeneous Deformation Induced (HDI) hardening and increases the long-range back stress and positive stress. In conclusion, the resistance seam welding and rolling treatment can improve the strength and wear resistance of the AlCoCrFeNi2.1 alloy without reducing its plasticity. It provides important reference value for the optimization of the microstructure and the improvement of the performance of high-entropy alloys. |
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