Microstructure and properties of TiC/Ti6Al4V composites by laser melting deposition assisted by ultrasonic energy field

Jiandong WANG, Ziang ZHAO, Yuzhou ZENG, Yu XUE, Wenhao DOU, Dapeng WANG, Yao GUAN

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Journal of Materials Engineering ›› 2025, Vol. 53 ›› Issue (6) : 126-135. DOI: 10.11868/j.issn.1001-4381.2024.000052
RESEARCH ARTICLE

Microstructure and properties of TiC/Ti6Al4V composites by laser melting deposition assisted by ultrasonic energy field

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Abstract

TiC/Ti6Al4V composites are prepared by synchronous ultrasonic energy field-assisted laser melting deposition. The effects of synchronous ultrasonic energy field treatment on the microstructure and properties of the composites with TiC volume fraction of 5% and 20%， respectively， are studied. The results show that the as-built composites contain inhomogeneous distributed undissolved TiC particles and in-situ TiC particles， among which 5%TiC/Ti6Al4V （volume fraction，the same below）composites contain chain shaped eutectic TiC with larger size， and 20%TiC/Ti6Al4V composites contain dendritic primary TiC with larger size. With the application of synchronous ultrasonic energy field treatment， the distribution uniformity of undissolved TiC particles in the composite is improved. Moreover， the in-situ TiC reinforcing phase is refined， where the chain shaped eutectic TiC transforms to granular eutectic TiC， and the size of dendritic primary TiC decreases. Due to the effect of synchronous ultrasonic energy field treatment， the microhardness of 5%TiC/Ti6Al4V and 20%TiC/Ti6Al4V increases from 406.5HV0.2 and 498.4HV0.2 to 414.2HV0.2 and 539.1HV0.2， respectively. The wear rates reduce from 1.82 × 10-6 mm3·m-1·N-1 and 1.04×10-6 mm3·m-1·N-1 to 1.78×10-6 mm3·m-1·N-1 and 9.48×10-7 mm3·m-1·N-1， respectively. The tensile strength of the 5%TiC/Ti6Al4V increases from 1075.23 MPa to 1116.31 MPa， the yield strength increases from 1021.51 MPa to 1043.12 MPa， and the fracture strain increases from 1.27 % to 1.45 %， which realizes the simultaneous improvement of strength and plasticity.

Key words

laser melting deposition / ultrasonic energy field / TiC/Ti6Al4V composites / microstructure / property

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Jiandong WANG , Ziang ZHAO , Yuzhou ZENG , et al . Microstructure and properties of TiC/Ti6Al4V composites by laser melting deposition assisted by ultrasonic energy field. Journal of Materials Engineering. 2025, 53(6): 126-135 https://doi.org/10.11868/j.issn.1001-4381.2024.000052

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