Powder bed fusion manufacturing of beta-type titanium alloys for biomedical implant applications: A review
Journal of Alloys and Compounds
School of Engineering
Australian Research Council Discovery Projects / ECU industrial grant “Corrosion behavior of metallic materials fabricated by 3D printing” (G1006320) / Natural Science Foundation of Jiangsu (Grant No. BK20201456) / Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials (Grant No. 2020GXYSOF01, 2021GXYSOF03) / Major Research Plan of the National Natural Science Foundation of China (Grant No. 92166112) / Project of MOE Key Lab of Disaster Forecast and Control in Engineering in Jinan University (Grant No. 20200904006) / Guangdong Province Basic and Applied Basic Research Foundation (Grant No. 2020B1515420004) / Guangxi Key Laboratory of Information Materials (Grant No. 211003-K) / Open Project Program of Wuhan National Laboratory for Optoelectronics (Grant No. 2021WNLOKF010) / Open Project Program of the State Key Laboratory of Mechanical Transmissions in Chongqing University (Grant No. SKLMT-MSKFKT-202102) / Fundamental Research Funds for the Central Universities (Grant No. 21622111)
ARC Numbers : DP110101653, DP210101353
Thanks to many fascinating properties, such as high mechanical properties, good corrosion resistance, and excellent biocompatibility, beta-type Ti alloys are frequently employed as biomedical implants. In recent decades, rapidly developed powder bed fusion (PBF) technologies have become new methods for fabricating beta-type Ti alloys. This article reviews the recent advances and insightful perspectives on the feedstock powder characteristics (e.g., pre-alloyed powder and elemental powder mixtures), microstructure, mechanical properties, and corrosion behavior of PBF-produced beta-type Ti alloys in the forms of bulk solid parts and lattice structures. As reviewed, PBF-produced bulk beta-type Ti alloys exhibit higher strength than their conventional counterparts, accompanying with slight decrease in the maximum deformation strain. The corrosion behavior of PBF-produced bulk beta-type Ti alloys with the identical corresponding chemical compositions is related to their phase constituents in microstructure, which results from the fabrication methods or processing procedures. Additionally, PBF-produced bulk beta-type Ti alloys still have higher elastic moduli than the human bones. Hence, with the assistance of PBF technologies, lattice structures of beta-type Ti alloys with lower and controllable moduli are developed to obtain reduced their elastic moduli. For biomedical implant applications, PBF-produced lattice structures of beta-type Ti alloys with multifunctional coatings may become promising materials in the future. Nevertheless, the investigations on the PBF-produced beta-type Ti alloys for biomedical implant applications are hitherto still in the initial stage.