Heterostructured NiCrTi Alloy Prepared by Spark Plasma Sintering with Enhanced Mechanical Properties,Corrosion and Tribocorrosion Resistance  

作　　者：Manzu Xu Leipeng Xie Shasha Yang Chengguo Sui Qunchang Wang Qihua Long Minghui Chen Fuhui Wang 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [2]HBIS Materials Technology Research Institute,Shijiazhuang,052165,China [3]AVIC Chengdu Aircraft Design&Research Institute,Chengdu,610041,China [4]Ningbo Haojia Electrical Appliance Co.,Ltd.,Ningbo,315400,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第1期164-176,共13页金属学报(英文版)

基　　金：financially supported by the Liaoning Revitalization Talents Program(No.XLYC2203133);the Fundamental Research Funds for the Central Universities(No.N2302018);the Ningbo Yuyao City Science and Technology Plan Project(No.2023J03010010).

摘　　要：Nickel-based alloys applied in marine environments often face multiple challenges of stress,corrosion and wear.In this work,heterostructured NiCrTi alloy was prepared by spark plasma sintering coarse Ni20Cr and ultrafine Ti powders.Apart that some are dissolved into the nickel alloy,Ti powders react in situ with Ni20Cr during sintering to form hard intermetallic Ni_(3)Ti.It builds up a typical heterostructure that endows NiCrTi alloy with well-balanced mechanical strength and plasticity,e.g.high yield strength of 1321 MPa,compressive strength of 2470 MPa,and compressive strain of 20%.On tribocorrosion,the hard shell enriched with Ti transforms to connected protrusion and form in situ surface texture.Oxides or wear debris are trapped at the textured surface and compacted to form a stable tribofilm.Thus negative synergy between corrosion and wear is observed for NiCrTi and high tribocorrosion resistance is achieved.At a potential of+0.3 V,the tribocorrosion rate of NiCrTi is reduced by an order of magnitude to 1.87×10^(-5)mm^(3)/(Nm)in comparison to the alloy Ni20Cr.

关 键 词：Nickel-based alloy Spark plasma sintering CORROSION HETEROSTRUCTURE Surface texturing TRIBOCORROSION 

分 类 号：TG146.22[一般工业技术—材料科学与工程]