Microstructure and tensile properties of TiNbZr alloy-based metal-matrix composites, reinforced with borides

The TiNbZr/(TiNbZr)B metal-matrix composites with different amounts of TiB2 (0.2, 2, 0.7 and 4 wt. %) were produced vacuum arc melting in a high purity argon atmosphere. The initial microstructure of the synthesized composites was composed of bcc TiNbZr matrix and needle-like monoborides (Ti, Nb) B...

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Bibliographic Details
Main Authors: Ozerov, M., Sokolovsky, V., Stepanov, N., Zherebtsov, S.
Format: Conference Proceeding
Language:English
Subjects:
Argon
Borides
Diameters
Electric arc melting
Elongation
Grain size
Metal matrix composites
Microstructure
Tensile properties
Titanium base alloys
Titanium diboride
Vacuum arc melting
Yield strength
Yield stress
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Summary:The TiNbZr/(TiNbZr)B metal-matrix composites with different amounts of TiB2 (0.2, 2, 0.7 and 4 wt. %) were produced vacuum arc melting in a high purity argon atmosphere. The initial microstructure of the synthesized composites was composed of bcc TiNbZr matrix and needle-like monoborides (Ti, Nb) B with the average thickness of 0.2, 0.4, 0.9 and 2.0 µm, respectively. EBSD analysis suggested microstructure refinement with an increase in the amount of borides: the grain size in the TiNbZr matrix was found to be: 180 µm, 130 µm, 65 µm, and 50 µm for the four conditions, respectively. Sections with equiaxed ω phase particles measuring∼10 nm in diameter were found in the microstructure of composites of all states. The composite with 0.2 wt. % TiB2 showed the lowest value of the yield strength 690 MPa and the highest elongation∼20 %. The highest strength properties were attained in the composite with 4 wt. % TiB2 in which the yield strength reached 900 MPa with, however, ductility only 0.5 %.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0164036