Microstructure, mechanical and tribological properties of a Ti-5Cu alloy and a B4C/Ti-5Cu in situ composite fabricated by laser powder bed fusion

Ren, Y. and Wu, H. and Agbedor, S.-O. and Lu, Y. and Zhang, Y. and Fang, Q. and Li, J. and Tian, Y. and Baker, I. (2022) Microstructure, mechanical and tribological properties of a Ti-5Cu alloy and a B4C/Ti-5Cu in situ composite fabricated by laser powder bed fusion. Materials Characterization, 192. ISSN 1044-5803

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Abstract

Both a novel Ti-5Cu alloy (in wt%) and a Ti-5Cu in situ composite containing 1 wt% B 4C were fabricated by laser powder bed fusion, and their microstructures, mechanical and tribological properties were systematically investigated. The microstructure of the Ti-5Cu was mainly composed of α Ti laths, Ti 2Cu and retained β phases, while the B 4C/Ti-5Cu composite was composed of α Ti laths, Ti 2Cu, TiC, TiB and TiB 2 phases. Both the Cu and B 4C additions promoted a transition from columnar to equiaxed grains for prior-β and α phases. The B 4C/Ti-5Cu composite was found to have a higher hardness (467 HV) than the Ti-5Cu (417 HV). Further, the composite exhibits a yield strength of 1100 MPa and an ultimate tensile strength of 1250 MPa. Values which are higher than those of the Ti-5Cu that exhibits a yield strength of 750 MPa and an ultimate tensile strength of 900 MPa. However, this strength increase comes at the expense of a reduction in elongation to failure from 6.2% to 1.5%. Even though the composite is significantly stronger, the two materials exhibited very similar wear rates (ω B4C/Ti-5Cu = 4.95 × 10 −4 mm 3 N −1 m −1 and ω Ti-5Cu = 4.85 × 10 −4 mm 3 N −1 m −1).

Item Type:
Journal Article
Journal or Publication Title:
Materials Characterization
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
177944
Deposited By:
Deposited On:
21 Oct 2022 14:40
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Nov 2022 11:47