Laser-induced topology optimized amorphous nanostructure and corrosion electrochemistry of supersonically deposited Ni_(30)Cr_(25)Al_(15)Co_(15)Mo_(5)Ti_(5)Y_(5) HEA coating based on AIMD  

作　　者：Xue Yan Cheng Zhang Yangshuai Li Youjian Yi Ziruo Cui Bingyuan Han 

机构地区：[1]State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China [2]Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences(UCAS),Hangzhou 310024,China [3]National Laboratory on High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China [4]Key Laboratory for Laser Plasmas(MOE),Collaborative Innovation Center of IFSA(CICIFSA),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [5]School of Automotive and Traffic Engineering,Jiangsu University of Technology,Changzhou 213001,China

出　　处：《Journal of Materials Science & Technology》2022年第11期257-269,共13页材料科学技术（英文版）

基　　金：supported by a grant from the Natural Science Foundation of Jiangsu Province (Grant No.BK20191036);the Foundation of Research Project of China (Grant No.JCKY 61420051911)。

摘　　要：A novel Ni_(30)Cr_(25)Al_(15)Co_(15)Mo_(5)Ti_(5)Y_(5) high-entropy alloy(HEA)coating was irradiated to optimize its internal structure via laser after supersonic particle deposition(SPD).Owing to the high energy density of the laser and large temperature gradient,the crystallization process of the molecules and atoms in the coating was restrained and supercooling occurred.Experimental results showed that a considerable number of nano-crystal grains precipitated and amorphous structures were formed because of the random orientation of the crystals.The baseline of differential scanning calorimetry scans obtained for the coating started to shift at the Tg of 939.37℃ and a step was observed.Multiple dispersion peaks and lattice fringes indicated that the nucleation of the irradiated laser-induced topology optimized(LTO)coating was incomplete.The laser-induced topology optimizing treatment led to quasi-isotropy in the SPD coating.Furthermore,the LTO coating exhibited a residual stress of 18.4 MPa,stress-strain response,and fatigue limit of 265 MPa.Hence,the LTO coating exhibited higher performance than the unirradiated SPD coating.The Nyquist and Bode electrochemical impedance spectra of the LTO coating,including two relaxation processes,indicated that the corrosion process steadily recovered to the equilibrium state.This implies that the uniform oxidation passivation layer on the surface of the LTO coating insulated the material from the corrosive medium,protecting the substrate from further corrosion,thus enhancing the structural security of the material for use in super-intense laser facility applications.

关 键 词：Ultrasonic atomization spin method(UASM) Laser-induced topology optimized(LTO) Amorphous nanostructure High-entropy alloy(HEA) Ab-initio molecular dynamics(AIMD) 

分 类 号：TG174.4[金属学及工艺—金属表面处理]