Selective laser melted TiB2/Ti6Al4V graded materials and first-principle calculations

• Published in: Materials letters Vol. 254; pp. 33 - 36
• Main Authors: Wang, Rui, Gu, Dongdong, Xi, Lixia, Lin, Kaijie, Guo, Meng, Zhang, Hongmei
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2019; Elsevier BV
• Subjects: Acicular powders; Chemical composition; Crystal growth; First principles; First-principle calculations; Graded materials; Interfaces; Laser beam melting; Materials science; Materials selection; Mathematical analysis; Microstructure; Nanohardness; Organic chemistry; Rapid prototyping; Selective laser melting; Three dimensional printing; Titanium base alloys; Titanium diboride; Interfaces; Selective laser melting; First-principle calculations; Microstructure; Graded materials
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2019.07.015

[Display omitted] •Graded materials additive manufacturing is beneficial to fabricate TiB2/Ti6Al4V multi-materials successfully.•The variations of chemical composition and nanohardness were gradual along the interface.•First-principles calculations demonstrated the axis growth of TiB crystals as well as the different hardness of this system. Selective laser melting (SLM), as a rapidly developed layer-by-layer 3D printing technology, has been demonstrated that it can be used for additive manufacturing of multi-materials. In this work, TiB2/Ti6Al4V multi-materials were manufactured by SLM. The results showed that interfacial microstructures consisting of un-melted TiB2 powders, columnar TiB crystals, and acicular TiB crystals were formed in the molten pool. Meanwhile, a variation nanohardness was developed with chemical compositions at the interfacial regions, owing to an in-situ reaction of Ti and TiB2. The first-principle calculations were used to reveal the axial growth of TiB crystals as well as the different hardness of this system.