Ultrafine-grained Ti6Al7Nb-xCu alloy with ultrahigh strength and exceptional biomedical properties  

作　　者：Yi Li Hai Wang Konrad Koenigsmann Hui Liu Shuyuan Zhang Ling Ren Ke Yang 

机构地区：[1]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]University of Chicago,Chicago,IL 60637,USA [4]Binzhou Institute of Technology,Shandong Key Laboratory of Advanced Aluminum Materials and Technology,Binzhou 256606,China

出　　处：《Journal of Materials Science & Technology》2023年第33期68-78,共11页材料科学技术（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2022YFC2406003);the Bintech-IMR R&D Program(No.GYY-JSBU-2022-008).

摘　　要：Grain refinement has been found to be able to improve the strength of metals without reducing their plasticity or ductility.In this work,ultrafine-grained Ti6Al7Nb-xCu(x=0,3 wt%,6 wt%,9 wt%)alloys were fabricated based on the clinically used Ti6Al7Nb alloy via Cu alloying fabrication strategy combined with dynamic recrystallization(DRX)from martensite during hot work.Our results indicate that Cu alloying is not only effective in reducing the width of martensite laths after quenching in theβphase region but also increases the nucleation rate of DRX during the high-temperature deformation.Additionally,the Ti2Cu phase that precipitates from the matrix can pin the grain boundaries and inhibit their growth during the high-temperature deformation.The optimal Cu concentration of Ti6Al7Nb-xCu alloy is determined to be 6 wt%,and the optimal deformation temperature is determined to be 750°C.At this Cu content and deformation temperature,the grain size is only 270 nm,the tensile strength is up to 1266±10 MPa,and the elongation is 17%.Compared with the commercial Ti6Al7Nb alloy,the ultrafine-grained Ti6Al7Nb-6Cu alloy has better overall mechanical properties,good biocompatibility,and unique antibacterial properties.This work provides a theoretical basis for fabricating the new antibacterial titanium-based alloys with high strength.

关 键 词：High strength titanium alloy Ultrafine grain ANTIBACTERIAL Dynamic recrystallization 

分 类 号：TG146.23[一般工业技术—材料科学与工程]