文献类型：期刊文献

英文题名：Nb doping in laser-cladded Fe25Co25Ni25(B0.7Si0.3)25 high entropy alloy coatings: Microstructure evolution and wear behavior

作者：Cheng, Jiangbo[1];Sun, Bo[1];Ge, Yunyun[1];Hu, Xianlong[2];Zhang, Lianhua[3];Liang, Xiubing[4];Zhang, Xiancheng[5]

机构：[1]Hohai Univ, Coll Mech & Mat, 8 Focheng West Rd, Nanjing 211100, Peoples R China;[2]Baosteel Roll Sci & Technol Co Ltd, Changzhou 213019, Peoples R China;[3]Jiangsu Huawei Machinery Mfg Co Ltd, Yancheng 224799, Peoples R China;[4]Acad Mil Sci PLA China, Natl Inst Def Technol Innovat, Beijing 100010, Peoples R China;[5]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2020

卷号：402

外文期刊名：SURFACE & COATINGS TECHNOLOGY

收录：;EI(收录号：20203509114704);WOS:【SCI-EXPANDED(收录号:WOS:000590183000036)】；

基金：This project is supported by National Key Research and Development Program of China (Grant No. 2018YFC1902404), National Natural Science Foundation of China (Grant No. 51975183), and Jiangsu Provincial Key Research and Development Program, China (Grant No. BE2017065, BE2019077).

语种：英文

外文关键词：High-entropy alloys; Laser cladding; Microstructure; Wear

摘要：The influence of Nb doping on the structure evolution, hardness and wear behaviors of laser-cladded (Fe0.25Co0.25Ni0.25(B0.7Si0.3)(0.25))(100-x)Nb-x (denoted as Nb x hereafter, x = 0, 1, 2, 3 and 4 at.%) high entropy alloy coatings were analyzed. Detailed characterization indicated that the microstructures evolve from face-centered cubic (FCC) and (Fe, Co, Ni)(2)B phases of the Nb-free coating to FCC, (Fe, Co, Ni)(2)B and amorphous phases of the Nb-containing coating (1 <= x <= 2). Notably, the glass formation ability of the coating is enhanced with the addition of Nb. As the Nb content further increases (3 <= x <= 4), it promotes the fully crystalline structures of body-centered-cubic (BCC), Laves, FCC and (Fe, Co, Ni)(2)B phases. The average crystalline size of the coating is refined from 3.5 to 1.3 mu m as a function of Nb content. The wear resistance of the coatings improves firstly and then aggravates with increasing of Nb content, which corresponds to the variation trend of microhardness and microstrain. The Nb-2 coating shows a maximum hardness value of 11.9 Gpa and excellent wear resistance due to the formation of amorphous structure and good elastic properties. The phase prediction in the coating was calculated by thermodynamic parameters. The relationships between the structure and properties of the present coating were elucidated. The new metal-metalloid high entropy metallic glassy coating and superior properties give its good promise for engineering applications.