选区激光熔化成型正六方柱体多孔TC4合金结构及力学性能研究  

Study on structures and properties of hexagonal porous Ti6Al4V alloy via selective laser melting

作　　者：吴艳琳 王勇[1,2] 乔丽英 姜定成[1,2] WU Yanlin;WANGYong;QIAO Liying;JIANG Dingcheng(College of Material Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]国家镁合金材料工程技术研究中心,重庆400044

出　　处：《功能材料》2018年第6期80-87,92,共9页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2015AA042501)

摘　　要：为了改善植入物与人体骨的力学相容性,避免应力屏蔽效应,采用选区激光熔化(SLM)技术制备了多孔Ti6Al4V合金。利用扫描电子显微镜对多孔钛试样的孔隙结构进行分析,并且测试了试样的力学性能。结果表明,测得的多孔件孔隙率约为46%,与原始设计相比,孔隙率降低16%;孔隙率降低主要来自激光扫描路径、熔池形状与尺寸以及粘粉等因素的影响;多孔件纵截面(平行于堆积方向)的硬度值高于横截面(垂直于堆积方向)的硬度值;压缩实验显示,其弹性模量为8.8GPa、屈服强度为348 MPa,力学性能与理论预测值有偏差,但较相同的致密合金与自然骨更为接近。In order to improve the mechanical compatibility of the metallic implants with the human bone and avoid stress shielding effect, porous Ti6Al4V specimens was fabricated by using selective laser melting （SLM）. Scanning electron microscope（SEM） was used to examine porous structures. The mechanical properties were also analyzed. It was found that the porosity of the SLMed specimens was about 46%, which was decreased by 16% as compared with the original designation. The decrease of porosity could be attributed to the scanning strategy, shape and size of the melting pool and the particles sticking to the surface. Microhardness of the longitudinal section （parallel to the build direction） was higher than that of the cross section （perpendicular to the build direction）. As shown by compression tests, the elastic modulus and yield strength of the as-SLMed porous Ti6Al4V alloy were 8.8 GPa and 348 MPa, respectively, which were much closer to the properties of the nature bones than those of dense TC4 were. However, these measured properties deviated from the calculated values.

关 键 词：选区激光熔化 多孔钛合金 孔隙结构 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]