Fabrication of ultrafine-grained Ti-15Zr-xCu alloys through martensite decompositions under thermomechanical coupling conditions

作     者：Wenwei Gao Hai Wang Konrad Koenigsmann Shuyuan Zhang Ling Ren Ke Yang Wenwei Gao;Hai Wang;Konrad Koenigsmann;Shuyuan Zhang;Ling Ren;Ke Yang

作者机构：Shi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China University of ChicagoChicagoIL 60637USA 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第127卷第32期

页      面：19-28页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 1002[医学-临床医学] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：the National Key Research and Development Program of China(No.2018YFC1106601) the Doctoral Scientific Research Foundation of Liaoning Province(No.2020BS002) 

主　　题：Titanium alloy Dynamic recrystallization Hot deformation Nucleation 

摘      要：Grain refinement is a well-recognized method to simultaneously increase the strength and ductility of metallic *** of ultrafine-grained metals in bulk using a simple low-cost approach is a long-term goal for material *** this work,based on the chemical composition of a biomedical Ti-15Zr alloy,a series of novel Ti-15Zr-xCu(x=0,3,5,7 wt.%)alloys were designed and *** alloys were quenched in the singleβphase region to obtain a martensitic microstructure and deformed in the temperature range of 710–750℃to obtain an ultrafine-grained microstructure through martensite decomposition under thermomechanical coupling *** results showed that Cu alloying could increase the dynamic recrystallization(DRX)nucleation rate due to its role in both refining martensitic lath width and increasing dislocation *** alloying could also suppress grain growth due to the precipitated Ti_(2)Cu particles exerting pinning forces on the grain *** optimal Cu content in the Ti-15Zr-xCu alloy was determined to be 5 wt.%.After being subjected to a compression leading to a 70%height reduction at 730℃and 1 s^(–1),the grain size of the Ti-15Zr-5Cu alloy was only 180±70 *** tensile strength of the as-prepared alloy reached 975±10 MPa,which was 45%higher than that of the conventional Ti-15Zr alloy(673±16 MPa).This increase in strength was achieved without any reduction in *** comprehensive mechanical properties of the ultrafinegrained Ti-15Zr-5Cu alloy are better than that of the Roxolid Ti–Zr alloy currently used for dental implants.