Low-cost surface modification of a biomedical Zr-2.5Nb alloy fabricated by electron beam melting  

作　　者：Caixu Wang Xiaoli Zhao Shujun Li Lu Liu Deliang Zhang Mitsuo Niinomi 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education),Northeastern University,Shenyang 110819,China [4]Tianjin Key Laboratory of Bone Implants Interface Functionalization and Personalization,Tianjin 300190,China [5]Institute for Materials Research,Tohoku University,Sendai,Miyagi 9808577,Japan [6]Division of Materials and Manufacturing Science,Graduate School of Engineering,Osaka University,Osaka 565-0871,Japan [7]Department of Materials Science and Engineering,Graduate School of Science and Technology,Meijo University,Nagoya 468-8502,Japan [8]Faculty of Chemistry,Materials and Bioengineering,Kansai University,Osaka 564-860,Japan

出　　处：《Journal of Materials Science & Technology》2023年第12期178-188,共11页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52071068 and 51871220);the Major Special Projects of the Plan“Science and Technology In-novation 2025”of China (No.2020Z060);the Fundamental Re-search Funds for the Central Universities (No.N2102013);Shenyang Talents program (RC200230),and the“111 Project”,China (No.B16009).

摘　　要：The Zr-2.5Nb alloy with a fine microstructure consisting ofαlaths was successfully prepared by electron beam melting(EBM).The thermal oxidation behaviors and kinetics of the as-built,and the EBM-built and hot isostatically pressed(HIPed)Zr-2.5Nb materials in a temperature range of 450-600°C were in-vestigated and compared with those of the alloy prepared by conventional casting and forging.It was found that the oxidation kinetics of the as-built and the forged materials followed the parabolic rate law during isothermal oxidation at 550°C,but the HIPed materials exhibited a parabolic-to-linear kinetic transition,suggesting that the larger grain sizes enhanced the oxidation.The oxide layers of all materials were composed of a large fraction of monoclinic zirconia phase(m-ZrO_(2))and a small fraction of tetrago-nal zirconia phase(t-ZrO_(2)),and transformed from t-ZrO_(2)to m-ZrO_(2)with increasing oxidation time.The surface hardness of the as-built,the forged and the HIPed materials increased from 215,204,and 188 HV before oxidation to 902,1070,and 1137 HV after oxidation,respectively.The cross-sections of the materi-als showed the presence of micropores and microcracks inside the oxide layers with thicknesses ranging from 4 to 8μm.With the oxidation temperature of 600°C and oxidation time duration of 3 h,a dense black m-ZrO_(2)oxide layer with smooth surface and 902 HV hardness was obtained on the EBM as-built Zr-2.5Nb materials.

关 键 词：Zr-2.5Nb alloy Electron beam melting Thermal oxidation Oxidation behaviors and kinetics Grain size 

分 类 号：TG146.23[一般工业技术—材料科学与工程]