icrostructure and properties of TiB2-reinforced Ti-35Nb-7Zr-5Ta processed by laser-powder bed fusio

Author(s)

Batalha, Rodolfo Lisboa ^{[1, 2]} ; Pinotti, Vitor Eduardo ^[1] ; Alnoaimy, Omar O. S. ^[3] ; Batalha, Weverson Capute ^[1] ; Gustmann, Tobias ^[4] ; Kosiba, Konrad ^[4] ; Pauly, Simon ^[5] ; Bolfarini, Claudemiro ^{[1, 6]} ; Kiminami, Claudio Shyinti ^{[1, 6]} ; Gargarella, Piter ^{[1, 6, 7]}

Affiliation

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos - Brazil

^[2] Inst Soldadura & Qualidade, Dept Res Dev & Innovat, Mat & Technol, Ave Prof Dr Cavaco Silva, 33 Taguspk, P-2740120 Oeiras - Portugal

^[3] Fraunhofer Inst Machine Tools & Forming Technol I, Nothnitzer Str 44, D-01187 Dresden - Germany

^[4] Leibniz Inst Solid State & Mat Res, Inst Complex Mat, Helmholtzstr 20, D-01069 Dresden - Germany

^[5] Univ Appl Sci Aschaffenburg, Fac Engn, Wurzburger Str 45, D-63743 Aschaffrnburg - Germany

^[6] Univ Fed Sao Carlos, Dept Mat Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos - Brazil

^[7] Univ Fed Sao Carlos, Ctr Characterizat & Dev Mat CCDM, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos - Brazil

• Document type: Journal article
• Source: Journal of Materials Research; NOV 2021.
• Web of Science Citations: 0

Abstract

The Ti-35Nb-7Zr-5Ta (wt%, TNZT) alloy was reinforced with TiB2 and synthesized by L-PBF. The relatively small TiB2 particles change the solidification structure from cellular to columnar-dendritic and lead to submicron TiB precipitation in the beta matrix. This results in pronounced grain refinement and reduction of texture. However, the microstructure of the additively manufactured TNZT-TiB2 is still different from the as-cast, unreinforced TNZT, which contains equiaxed and randomly oriented grains. The beta phase is less stable in the as-cast samples, leading to stress-induced martensitic transformation and recoverable strain of 1.5%. The TNZT with 1 wt% of TiB2 presents significantly higher compressive strength (sigma(YS) = 495 MPa) compared to unreinforced samples (sigma(YS) = 430 MPa), without sacrificing ductility or altering Young's modulus (E approximate to 46 GPa). The addition of a small fraction of TiB2 to the TNZT alloy synthesized by L-PBF is a promising alternative for manufacturing sophisticated components for biomedical applications. (AU)

• FAPESP's process: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys
• Grantee: Claudio Shyinti Kiminami
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/27031-4 - Effect of process parameters on the metallurgical characteristics of additive-manufactured alloys
• Grantee: Piter Gargarella
• Support Opportunities: Research Grants - Young Investigators Grants