激光增材制造<strong>AlCoCrFeNiSi</strong>高熵合金的氧化行为

doi:10.11902/1005.4537.2024.313

中国腐蚀与防护学报

2025, Vol. 45

Issue (1): 217-223 CSTR: 32134.14.1005.4537.2024.313 DOI: 10.11902/1005.4537.2024.313

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激光增材制造AlCoCrFeNiSi高熵合金的氧化行为

郭静波¹, 杨守华¹(

), 周子翼¹, 牟仁德², 谢云¹, 舒小勇¹, 戴建伟², 彭晓¹

1 南昌航空大学材料科学与工程学院南昌 330063
2 中国航发北京航空材料研究院北京 100095

High-temperature Oxidation Behavior of Laser Additively Manufactured AlCoCrFeNiSi High Entropy Alloy

GUO Jingbo¹, YANG Shouhua¹(

), ZHOU Ziyi¹, MU Rende², XIE Yun¹, SHU Xiaoyong¹, DAI Jianwei², PENG Xiao¹

1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

引用本文:

郭静波, 杨守华, 周子翼, 牟仁德, 谢云, 舒小勇, 戴建伟, 彭晓. 激光增材制造AlCoCrFeNiSi高熵合金的氧化行为[J]. 中国腐蚀与防护学报, 2025, 45(1): 217-223.
Jingbo GUO, Shouhua YANG, Ziyi ZHOU, Rende MU, Yun XIE, Xiaoyong SHU, Jianwei DAI, Xiao PENG. High-temperature Oxidation Behavior of Laser Additively Manufactured AlCoCrFeNiSi High Entropy Alloy[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 217-223.

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摘要:

利用激光熔化沉积技术(LMD)增材制造了具有单相bcc结构的Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 (原子分数)高熵合金(HEA)，其晶粒尺寸随着激光功率从900 W降低至700 W而逐步减小。在1100 ℃“干”空气和含10%H₂O (体积分数)的“湿”空气的恒温氧化实验表明：该HEA能稳定生长单一的Al₂O₃膜；晶粒尺寸减小导致所生长Al₂O₃膜的氧化速度降低；H₂O蒸气加快Al₂O₃膜生长速度。

关键词 ：激光增材制造, AlCoCrFeNiSi, 高熵合金, 高温氧化

Abstract：

High entropy alloy (HEA) of Al_0.21Co_0.17Cr_0.13Fe_0.11Ni_0.18Si_0.20 (atomic fraction) was fabricated by means of laser melting deposition (LMD) technique. The prepared alloy consists of a single body-centered-cubic (bcc) phase, and its grain size gradually refined as the laser power decreased from 900 W to 700 W. The bcc HEAs obtained at various laser powers were subjected to isothermal oxidation at 1100 ^oC in either dry air or wet air (air + 10%H₂O (volume fraction)), respectively. There were several observations: all HEAs had the ability to thermally develop a protective scale of Al₂O₃ in both dry and wet airs; the decrease in grain size favored the formation of Al₂O₃ scale with a slower growth rate; the presence of H₂O vapor accelerated the growth rate of Al₂O₃ scale. Finally, the above findings were discussed and interpreted.

Key words： laser additive manufacturing AlCoCrFeNiSi high entropy alloy high-temperature oxidation

收稿日期: 2024-09-25 32134.14.1005.4537.2024.313

ZTFLH:

TG174

基金资助:国家自然科学基金(52371067)

通讯作者: 杨守华，E-mail：by2201158@buaa.edu.cn，研究方向为高熵合金高温氧化与防护

Corresponding author: YANG Shouhua, E-mail: by2201158@buaa.edu.cn

作者简介: 郭静波，男，1997年生，硕士

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.313 或 https://www.jcscp.org/CN/Y2025/V45/I1/217

表1 采用LMD制备Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20高熵合金的工艺参数

表2 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20化学成分(原子分数，%) (atomic fraction / %)

图1 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20的XRD图谱

图2 700 W与900 W激光功率下沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20腐刻后微观形貌与晶粒大小分布图，(a)中插图为放大图像

图3 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20在“干”空气中的氧化增重曲线及氧化增重平方随时间的变化曲线

图4 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20在“干”空气中氧化20 h后的截面形貌

图5 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20在“湿”空气中的氧化增重曲线及氧化增重平方随时间的变化曲线

图6 不同激光功率沉积的Al0.21Co0.17Cr0.13Fe0.11Ni0.18Si0.20在“湿”空气中氧化20 h后的截面形貌

图7 HEA中各组成元素及其氧化物的Ellingham-Richardson图

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