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高熵合金AlCoCrFeNi2.1的共晶组织及析出相研究

熊 婷，郑士建*，马秀良
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2020年 第39卷 第5期: 1000-6281（2020）05-470-06     下载地址：

高熵合金AlCoCrFeNi2.1的共晶组织及析出相研究

熊 婷1,2，郑士建3*，马秀良1,4

(1.沈阳材料科学国家研究中心, 中国科学院金属研究所，辽宁 沈阳110016；2.中国科学技术大学，安徽 合肥230026；3.天津市材料层状复合与界面控制技术重点实验室, 材料科学与工程学院, 河北工业大学, 天津300130；4.材料科学与工程学院，兰州理工大学，甘肃 兰州730050)

摘 要  本文利用X射线衍射、扫描电子显微镜和透射电子显微镜对共晶高熵合金AlCoCrFeNi2.1的显微结构进行了多尺度表征。结果表明，合金中的共晶两相分别为面心立方相和体心立方有序相-B2相；共晶两相中均存在纳米级析出相，面心立方相中存在L12析出相，B2相中存在无序体心立方析出相。铸态合金的相组成偏离合金平衡相组成，合金在凝固过程中首先形成面心立方相和B2相共存的共晶组织，在冷却过程中L12相及体心立方相分别在面心立方相及B2相中析出。

关键词 共晶高熵合金；微观结构；扫描电子显微镜；透射电子显微镜

中图分类号：TG115.21+5.3 

文献标识码：Adoi:10.3969/j.issn.1000-6281.2020.05.003

 

An investigation on the eutectic structure and precipitates in the high-entropy alloy AlCoCrFeNi2.1

XIONG Ting1，2, ZHENG Shi-jian3*, MA Xiu-liang1，4

(1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016; 2. University of Science and Technology of China, Hefei Anhui 230026; 3.Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130; 4. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou Gansu 730050, China)

 

Abstract  In this paper, the multi-scale characterization was performed in the eutectic high-entropy alloy (EHEA) AlCoCrFeNi2.1 using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the two phases in the eutectics are face-centered cubic (FCC) phase and ordered body-centered cubic phase-B2 phase, and FCC and B2 phases possess nanoscale L12 and disordered body-centered cubic (BCC) precipitate, respectively. The phase composition of the as-cast alloy deviates from the equilibrium phase composition. During the solidification process, the eutectic structure of FCC and B2 phases is formed firstly. However, during the cooling process, L12 phase and BCC phase are precipitated out from theFCC phase and B2 phase, respectively, which is resulted from the slow cooling rate.

Keywords  eutectic high entropy alloy (EHEA); microstructure；scanning electron microscope; transmit

 

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