A novel CoCrFeNi high entropy alloy matrix self-lubricating composite | |
Department | 先进润滑与防护材料研究发展中心 |
Zhang AJ(张爱军)1,2; Han JS(韩杰胜)1; Su B(苏博)1; Meng JH(孟军虎)1; Meng JH(孟军虎) | |
The second department | 固体润滑国家重点实验室 |
2017 | |
Source Publication | Journal of Alloys and Compounds |
ISSN | 0925-8388 |
Volume | 725Pages:700-710 |
Abstract | A novel high entropy alloy (HEA) matrix self-lubricating composite was prepared by spark plasma sintering. In this composite, the CoCrFeNi HEA was selected as the matrix, Ag and BaF2/CaF2 eutectic were used as solid lubricants. The hardness, yield strength, compressive strength, and fracture toughness of the composite were 151 HV, 468 MPa, 787 MPa, and 18.3 MPa m0.5, respectively. The good mechanical properties of the composite were mainly derived from the CoCrFeNi HEA matrix. The friction coefficients and the wear rates of the composite from room temperature (RT) to 800 ℃ were below 0.26 and 10-5 mm3/N.m, respectively. The tribological properties of the composite were superior than those of the CoCrFeNi HEA and conventional high temperature self-lubricating materials. Ag played a key role in reducing the friction coefficients of the composite at temperatures from RT to about 400 ℃. The good lubricity of the composite from 400 to 800 ℃ was mainly attributed to the combined lubricating effect of Ag, BaF2/CaF2 eutectic and various metal oxides that formed on the composite surface at high temperatures. The large work-hardening capacity of the HEA matrix was very crucial for improving the wear resistance of the composite at temperatures from RT to 800 ℃. Due to the combination of the CoCrFeNi HEA matrix and the solid lubricants, the HEA matrix self-lubricating composite simultaneously possessed good mechanical properties and excellent tribological properties over a wide range of temperatures. |
Keyword | High Entropy Alloy Self-lubricating Composite Microstructure Mechanical Properties Tribological Properties |
Subject Area | 材料科学与物理化学 |
DOI | 10.1016/j.jallcom.2017.07.197 |
Funding Organization | funded by a grant from Major Programs of the Chinese Academy of Sciences during the 13th Five-Year Plan Period |
Indexed By | SCI |
If | 3.133 |
Language | 英语 |
Funding Project | 金属基高温润滑材料研究组 |
compositor | 第一作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/22508 |
Collection | 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 固体润滑国家重点实验室(LSL) |
Corresponding Author | Meng JH(孟军虎) |
Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
Recommended Citation GB/T 7714 | Zhang AJ,Han JS,Su B,et al. A novel CoCrFeNi high entropy alloy matrix self-lubricating composite[J]. Journal of Alloys and Compounds,2017,725:700-710. |
APA | Zhang AJ,Han JS,Su B,Meng JH,&孟军虎.(2017).A novel CoCrFeNi high entropy alloy matrix self-lubricating composite.Journal of Alloys and Compounds,725,700-710. |
MLA | Zhang AJ,et al."A novel CoCrFeNi high entropy alloy matrix self-lubricating composite".Journal of Alloys and Compounds 725(2017):700-710. |
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