A novel Co-free high-entropy alloy with excellent antimicrobial and mechanical properties  

作　　者：Wen-Yu Li Ming-Liang Wang Xiao-Di Wang Tong-Min Wang Ting-Ju Li Yi-Ping Lu 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian,116024,China

出　　处：《Rare Metals》2025年第1期581-590,共10页稀有金属(英文版)

摘　　要：Microbiologically influenced corrosion and bacterial infection lead to serious losses to human production and life.Developing alloys with inherent antibacterial properties is a vital way to solve the above issues.However,the widely used Cu-containing stainless steels show insufficient antimicrobial properties and relatively low yield strengths,which further limit their application in extreme service environments.Based on the design concept of high-entropy alloys(HEAs),a novel low-cost Co-free CrFeNi_(0.5)Cu_(0.3)HEA with an optimal combination of antibacterial and mechanical properties was designed and prepared.This alloy comprises triple-phase structures,including FeNi-rich face-centered cubic(FCC1),Cu-rich FCC2 and FeCr-rich body-centered cubic(BCC).The antibacterial rate of this HEA is up to 99.99%against Escherichia coli,which is far superior to that of classic 304 Cu-bearing stainless steel(304-Cu SS)and the most reported antibacterial alloys.In addition,the HEA exhibits excellent mechanical properties with a tensile strength of 1032 MPa and yield strength of 842 MPa,far surpassing the corresponding values of 304-Cu SS(i.e.,528 MPa and 210 MPa,respectively).These findings provide new insights for the development of low-cost and high-performance antibacterial alloys.

关 键 词：High-entropy alloy MICROSTRUCTURE Antibacterial property Mechanical property 

分 类 号：TG1[金属学及工艺—金属学]