Additive manufacturing of Ti-6Al-4V lattice structures with high structural integrity under large compressive deformation
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第2期
论文作者：Kun Yang Jian Wang Liang Jia Guangyu Yang Huiping Tang Yuanyuan Li
文章页码：303 - 308
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）.
Kun Yang1,2，Jian Wang2，Liang Jia2，Guangyu Yang2，Huiping Tang1,2，Yuanyuan Li1
1. College of Materials Science and Engineering, Jilin University2. State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research
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）.
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