Effect of Ti additions on microstructure and mechanical properties of Cu-Cr-Zr alloy  

作　　者：Chenying Shi Muzhi Ma Biaobiao Yang Yuling Liu Yushen Huang Yong Du 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,China [3]IMDEA Materials Institute,C/Eric Kandel 2,Getafe,28906 Madrid,Spain [4]Department of Materials Science,Polytechnic University of Madrid/Universidad Politécnica de Madrid,E.T.S.de Ingenieros de Caminos,28040 Madrid,Spain

出　　处：《Journal of Materials Science & Technology》2023年第32期69-80,共12页材料科学技术（英文版）

基　　金：the young scholars of the National Natural Science Foundation of China(Grant No.5210011609);the National Natural Science Foundation of Hunan Province(Grant No.2021JJ40749);Chenying Shi would like to express the support by China Scholarship Council(No.202006370260);Biaobiao Yang would like to express the support by China Scholarship Council(No.202106370122).

摘　　要：Ti additions in Cu–Cr–Zr alloys are useful for achieving high mechanical properties.In this work,the influence of Ti contents(0.25 wt%,0.6 wt%,and 1.02 wt%)on the microstructure,mechanical,and electrical properties of Cu–Cr–Zr alloys has been investigated experimentally,along with thermodynamic and kinetic calculations.The electrical conductivity decreased but the hardness/strength increased with increasing Ti content.The lower electrical conductivity is due to increased electron scattering through the solution of more Ti atoms in the Cu matrix.As for the higher hardness/strength,it is mainly owing to higher dislocation density and finer FCC-Cr precipitates.Furthermore,a model considering the size distributions of precipitates is adopted to calculate precipitation strengthening quantitatively.The calculated yield strengths are consistent with the experimental ones for the alloys.The thermodynamic and kinetic calculations reveal that increasing Ti content can facilitate the nucleation of FCC-Cr but enhance its activation energy,hence hindering the growth process.The present work study can provide an effective strategy for producing copper alloys with expected performance.

关 键 词：Cu-Cr-Zr-Ti alloy Mechanical and electrical properties Microstructure Precipitation behavior Thermodynamic and kinetic CALCULATIONS 

分 类 号：TG146.23[一般工业技术—材料科学与工程]