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Additive manufacturing of Ti-6Al-4V lattice structures with high structural integrity under large compressive deformation

查看全文 作　　者：Kun [1,2]Yang;Jian [2]Wang;Liang [2]Jia;Guangyu [2]Yang;Huiping [1,2]Tang;Yuanyuan [1]Li 高影响力作者 机构地区：[1]College of Materials Science and Engineering, Jilin University;[2]State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第2期,共6页高影响力期刊 基　　金：supported by the National Key Research and Development Project (Grant No. 2016 YFB 1101403);the National Key Foundation for Exploring Scientific Instrument of China (Grant No. 2016 YQ 51627805) 摘　　要：Additively manufactured Ti-6 Al-4 V lattice structures have found important niche applications. However, they often show insufficient compressive ductility or insufficient structural integrity. In this study,a batch of 45 octahedral Ti-6 Al-4 V lattice structures was manufactured in three different strut diameters(0.5, 1.0, 1.5 mm) by selective electron beam melting(SEBM). The influence of post-SEBM annealing on the compressive deformation characteristics of the lattice structure was investigated. The as-built Ti-6 Al-4 V lattices fragmented when the compressive strain reached 13%–23% depending on strut diameter.Annealing at 950?C(β transus temperature: 995?C) only slightly improved the compressive ductility of the lattice structures. However, annealing at 1050?C(β-annealing) fundamentally changed the compressive deformation mode of the lattice structures. The resultant compressive stress-strain curve was featured by a long smooth plateau and no facture occurred even after significant densification of the lattice structure had taken place(>50% of compressive strain). 关 键 词：Selective electron beam MELTING TI-6AL-4V LATTICE structures DUCTILITY ANNEALING BETA ANNEALING
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