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Cost-affordable, high-performance Ti–TiB composite for selective laser melting additive manufacturing

Published online by Cambridge University Press:  13 January 2020

Yangping Dong ,
Yulong Li ,
Thomas Ebel  and
Ming Yan
Yangping Dong
Affiliation:
Key Lab for Robot &Welding Automation of Jiangxi Province, Mechanical and Electrical Engineering School, Nanchang University, Nanchang 330031, China; and Department of Materials Science and Engineering, and Shenzhen Key Lab for Additive Manufacturing of High-performance Materials, Southern University of Science and Technology, Shenzhen 518055, China
Yulong Li*
Affiliation:
Key Lab for Robot &Welding Automation of Jiangxi Province, Mechanical and Electrical Engineering School, Nanchang University, Nanchang 330031, China
Thomas Ebel
Affiliation:
Institute of Material Research, Helmholtz-Zentrum Geesthacht, Geesthacht 21502, Germany
Ming Yan*
Affiliation:
Department of Materials Science and Engineering, and Shenzhen Key Lab for Additive Manufacturing of High-performance Materials, Southern University of Science and Technology, Shenzhen 518055, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Titanium and its alloys are probably the most suitable materials for selective laser melting (SLM) additive manufacturing to process. However, the high cost of raw powder materials limits the industrial application of as-printed Ti products. In this study, we have formulated a cost-affordable Ti–TiB composite powder for SLM, to simultaneously achieve excellent mechanical performance and cost effectiveness. The optimization of the processing parameters will be shown to lead to high relative density (99.3%) for the as-printed Ti–TiB composites containing (0.5, 1, and 2 wt%) TiB2. Furthermore, by incorporating TiB2, the as-printed composites exhibit much improved fracture strength (up to 1813 MPa) and microhardness (up to 412 HV), among which the Ti–0.5 wt% TiB2 has demonstrated a great combination of strength (1007 and 1646 MPa as yield and fracture strengths, respectively) and tensile ductility (~8%). The solidification pathway for the Ti–TiB composite during SLM has been investigated, and the underlying mechanism for achieving high yield strength is discussed based on existing models for shear-lag strengthening, grain refinement, and dispersion strengthening.

Keywords

Ticompositeadditives
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 15: Focus Issue: Additive Manufacturing of Metals: Complex Microstructures and Architecture Design , 14 August 2020 , pp. 1922 - 1935
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Copyright
Copyright © Materials Research Society 2020

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