Selective laser melting of in situ titanium-titanium boride composites: processing, microstructure and mechanical properties

Attar, Hooyar, Boenisch, Matthias, Calin, Mariana, Zhang, Lai-Chang, Scudino, Sergio and Eckert, Juergen (2014) Selective laser melting of in situ titanium-titanium boride composites: processing, microstructure and mechanical properties. Acta Materialia, 76 13-22. doi:10.1016/j.actamat.2014.05.022


Author Attar, Hooyar
Boenisch, Matthias
Calin, Mariana
Zhang, Lai-Chang
Scudino, Sergio
Eckert, Juergen
Title Selective laser melting of in situ titanium-titanium boride composites: processing, microstructure and mechanical properties
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2014-09-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.actamat.2014.05.022
Open Access Status Not yet assessed
Volume 76
Start page 13
End page 22
Total pages 10
Place of publication Kidlington, Oxford, United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
This study presents results of selective laser melting (SLM) processing of in situ Ti-TiB composites from optimally milled Ti-TiB2 powder. Optimized tuning of the SLM manufacturing parameters was applied to obtain almost fully dense (>99.5%) Ti-TiB composites. X-ray diffraction and electron diffraction patterns as well as microstructural investigations indicate a chemical reaction during SLM in which irregular-shape titanium diboride (TiB2) particles react with pure Ti to form needle-shape titanium monoboride (TiB) particles. Transmission electron microscopy investigations reveal that Ti grains are refined significantly due to the existence of B. The microhardness, yield stress and compressive strength of the SLM-produced Ti-TiB composites increase to 402 Hv, 1103 MPa and 1421 MPa, respectively, compared to 261 Hv, 560 MPa and 1136 MPa, respectively, for the SLM-produced commercially pure Ti. These improvements are mainly due to strengthening and hardening effects induced by TiB particles and refinement of Ti grains. Fractography analyses show that a mixture of splitting/shearing and smooth/rough zones covers the fracture surfaces of failed composite samples after compression testing.
Keyword Fractography
Mechanical properties
Microstructure
Selective laser melting
Ti-TiB composite
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP110101653
264635
SFB/Transregio 79
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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